Abstract: A virtual controller is configured to send control commands to an edge controller such as in I/O module that is connected to a building management system component. The IO module is configured to communicate with the virtual controller and to provide local control commands to the building management system component that are based upon the control commands from the virtual controller when communication with the virtual controller is determined by the IO module to be functioning normally and are based upon one or more fail-safe commands generated by the IO module when communication with the virtual controller is determined by the IO module to not be functioning normally.

Abstract: A sensor device includes a detection electrode opposing an external electrode, and generating a voltage corresponding to a change in capacitance; a capacitive amplifier circuit having a first capacitor and a second capacitor, and configured to detect the voltage generated in the detection electrode, and output a detection signal obtained by amplifying the voltage generated in the detection electrode based on a capacitance ratio between the first capacitor and the second capacitor; a reset switch configured to reset the voltage of the detection electrode to a reference potential; a changeover switch configured to switch the capacitive amplifier circuit between a capacitive amplifier and a voltage follower; a second changeover switch configured to disconnect the first capacitor from the capacitive amplifier circuit; and a second reset switch configured to reset a voltage of the first capacitor to the reference potential.

Abstract: A touch panel, a manufacturing method thereof and a display device are provided. The touch panel includes a first touch electrode, a second touch electrode and a one-piece insulating element. The second touch electrode includes an electrode section disposed in a same layer as the first touch electrode and a connecting section under the electrode section. The electrode section includes a first electrode section and a second electrode section, which are electrically connected by the connecting section, and the connecting section is spaced apart from the first touch electrode. The insulating element includes a first insulating section between the connecting section and the first touch electrode and a second insulating section between the first electrode section and the first touch electrode and also between the second electrode section and the first touch electrode. The insulating sections can be obtained by performing a patterning process, so that the manufacturing method of the touch panel is simplified.

Abstract: An analog signal is supplied to a first conversion section of a physical quantity sensor device, converted to digital, and set to be an initial output value of the first conversion section. Adjustment information for the first conversion section is calculated based on the error between the initial output value and a target output value of the first conversion section. Before an initial output value of a physical quantity sensor is measured for calculating initial setting information of a physical quantity sensor device, the first conversion section is adjusted based on the adjustment information. Also, a digital signal is supplied to a second conversion section of the physical quantity sensor device, converted to analog, and set to be an initial output value of the second conversion section. The second conversion section is adjusted based on adjustment information for the second conversion section.

Abstract: A ratio meter includes a converter circuit, a first counter, a delay circuit, and a second counter. The converter circuit is configured to receive a temperature-independent signal, to convert the received temperature-independent signal into a first frequency signal during a first phase, to receive a temperature-dependent signal, and to convert the temperature-dependent signal into a second frequency signal during a second phase. The first counter is configured to receive the first frequency signal and to generate a control signal by counting a predetermined number of pulses of the first frequency signal count. The delay circuit is configured to delay the control signal for a predetermined time delay. The second counter is configured to receive the second frequency signal and to generate a count value by counting the second frequency signal.

Abstract: Disclosed herein is a touch sensor using a metal electrode. More specifically, the present invention relates to a touch sensor capable of implementing reliability of the metal electrode and having economical efficiency even under a condition of high temperature and humidity by forming a first protection layer including a heterocycle compound on metal fine lines forming the electrode pattern.

Abstract: An object of the invention is to provide a fuel-aspect sensor having higher detection accuracy. A first electrode is inserted into a hole formed in a first housing member. A cylindrical second electrode is inserted into and firmly fixed to the first electrode by a cylindrical insulating member. A first elastic member, for example, made of rubber, is arranged between the first electrode and a second housing member. The first electrode has a large-diameter portion, which is biased by the first elastic member toward a sealing surface formed on an inner wall of the hole, so as to fluid-tightly seal a space between the first electrode and the second housing member.

Abstract: The disclosure has: a detection electrode (2) that detects an electrostatic capacitance; a shield electrode (3); a shield drive circuit (31) that switches between a first electric potential and a second electric potential to apply the first or second electric potential to the shield electrode; a detection circuit (21) that outputs a detection signal depending on the electrostatic capacitance detected; and a determination circuit (6) that obtains a first detection signal and a second detection signal as the basis to determine whether an abnormality of the detection electrode (2) or the shield electrode is present or absent. The first detection signal depends on the electrostatic capacitance detected when the shield drive means (31) applies the first electric potential to the shield electrode (3). The second detection signal depends on the electrostatic capacitance detected when the shield drive means (31) applies the second electric potential to the shield electrode.

Abstract: A measurement circuit includes a switch unit with a number of keys selectively pressed to output different resistance regulating signals. A resistance setting circuit receives the resistance regulating signals and connects different resistances to a voltage circuit and a current circuit. The voltage circuit outputs different voltages. The current voltage receives a voltage from the voltage circuit and outputs a current to a capacitor. A detecting circuit measures a temperature of the capacitor and outputs the temperature to the resistance setting circuit. The resistance setting circuit compares the received temperature with a preset temperature. If the received temperature is equal to or greater than the preset temperature, the resistance setting circuit outputs short-circuit information of the capacitor. If the received temperature is less than the preset temperature, the resistance setting circuit outputs normal information of the capacitor. A display unit displays the information of the capacitor.

Abstract: The present invention relates to a system for measuring a capacitor (C). A current source (12) is connected in parallel to the capacitor (C) between a supply plane (Vc) and ground (VGND) for providing a current to the capacitor (C). A voltage level-shift is connected between the supply plane (Vc) and the ground (VGND) in parallel to the capacitor (C) and in parallel to the current source (I2). The voltage level-shift senses a voltage across the electronic component (C) and provides a level-shifted output voltage Vout in dependence thereupon. The voltage level-shift comprises a resistor (RI) connected in series with a current source (II) and an output port interposed between the resistor (RI) and the current source (II). The current sources (I,) and (12) have opposite temperature coefficients such that the current provided to the electronic component is substantially constant.

Abstract: A touch sensor assembly having a selectable sensitivity level allows for a user to activate a touch sensor while wearing hand covers. The touch sensor assembly includes a touch sensor, a comparison unit, and a control unit. The touch sensor has a selectable sensitivity level, and detects a value corresponding to a capacitance of the touch sensor. The comparison unit has a predetermined threshold stored therein, and determines activation of the touch sensor if the detected value exceeds the predetermined value. The control unit is operable to select a sensitivity level of the touch sensor by varying the predetermined threshold by an amount unrelated to an environmental effect on the touch sensor.

Abstract: A system includes a first module, a second module, and a third module. The first module determines a first temperature and a first power dissipation value of a thermistor based on a resistance of a first resistor connected in series with the thermistor. The second module, after disconnecting the first resistor and connecting a second resistor in series with the thermistor, determines a second temperature and a second power dissipation value of the thermistor based on a resistance of the second resistor. The third module determines a thermal dissipation factor based on the first and second temperatures and the first and second power dissipation values, and corrects temperature sensed by the thermistor based on the thermal dissipation factor.

Abstract: A system for testing a power supply unit includes a test sub-system and a test control sub-system connected to the test sub-system and the power supply unit. The test sub-system perform tests and record the results. The test control sub-system is capable of selecting test items to test the power supply unit and setting an execution sequence of the test items. The test items includes a standby test item for testing the power supply unit at a standby state, a normal test item for testing the power supply unit at a normal state, and an over temperature protection test item for testing the power supply unit at an over heated state. The test control sub-system is further capable of automatically switching the standby test item to the normal test item, and switching the normal test item to the over temperature protection test item.

Abstract: Measuring device for local measurement of an electrical property of the content of a container, wherein at least three electrodes are disposed adjacently of each other in height direction and electrically insulated from each other, wherein each of the electrodes can be connected to an electrical measuring circuit for measuring, via one of the electrodes and one other electrode connected to an electrical earth, the electrical property of the content of the container in the vicinity of the electrodes, and wherein the electrical measuring circuit is adapted to generate at least one electric measuring signal representing the measured electrical property, and a control unit for connecting the one electrode to the electrical measuring circuit and connecting the other electrode to an electrical earth.

Abstract: In a fuel property sensor, a pair of first and second electrodes is arranged in a fuel chamber to measure an electric capacitance, thereby detecting a mixing ratio of alcohol to gasoline in a fuel of the fuel chamber. An outer wall surface of the first electrode is exposed in the fuel, and a sensing portion contacts an inner wall surface of the first electrode to detect a temperature of the fluid via the first electrode. One end portion of a lead is connected to the sensing portion and the other end portion thereof is connected to a plate portion attached to a housing. Furthermore, an elastic deformation portion is provided as a part of the lead to be elastically deformed, and to cause the sensing portion to be biased in a direction on which the sensing portion contacts the inner wall surface of the first electrode.

Abstract: An electronic sensor for determining if a metal hose connector is fully snapped into its mating plastic connector. This sensor detects the metal hose in position by having a coil in position over the plastic connector and at the end of the metal hose when it is in correct position. The metal of the hose interacts with the magnetic field of the coil to both increase the inductance and greatly reduce the ‘Q’ because of the “shorted turn” effect of the round metal hose. The sensor inherently detects faults in its own circuit because of the comparator voltage window. Faults such as an open coil, oscillator or rectifier failure will appear at the output as “hose disconnected” which is the desirable failure mode. The invention also detects external faults because of the two non-zero, non-line voltages seen during normal operation.

Abstract: An occupant detection system including a seat assembly comprising a seat cushion having a seating surface, a heating element adjacent the seating surface, said heating element formed of electrically conductive material, a heating circuit electrically coupled to the heating element, said heating circuit configured to supply an electrical current to the heating element effective to generate heat by the heating element, an occupant detection circuit electrically coupled to the heating element, said occupant detection circuit configured to detect an occupant presence near the heating element, and an isolation circuit interposed between the heating circuit and the heating element, said isolation circuit configured to prevent the heating circuit from influencing the occupant detection circuit, said isolation circuit comprising a common mode choke.

Abstract: A transducer system that includes a piezoelectric transducer and a self-diagnosis system electrically connected to the transducer. In one embodiment, the self-diagnosis system is configured to detect when a debonding defect has occurred in the bond between the transducer and a host structure and to detect when a crack has occurred in the transducer itself. The self-diagnosis system implements debonding-detection and crack-detection schemes that can distinguish between debonding and cracking, as well as distinguish these problems from changes arising from temperature variation.

Abstract: An improved power sensor having an input connector connected to an input port having a center pin and a ground side; an amplifier; first and second detectors; and a thermal stabilization system, including a thermal mass disposed between the ground side of the input connection and the detectors, a ground plane for holding the temperature of thermally sensitive components constant to within 2 degrees C., and a thermal impedance disposed between the center pin of the input port, preferably including a splitter and at least one DC capacitor, and a temperature sensor disposed on the ground plane.

Abstract: Method and system for periodically measuring the junction temperature of a semiconductor device. The junction exited by at least two sequential predetermined currents of different magnitudes. The voltage response of the junction to the at least two currents is measured and the temperature of the junction is calculated, while substantially canceling ohmic effects, by using the voltage response and a correction factor obtained by periodically. Whenever desired, the junction is exited by a set of at least four sequential different currents having known ratios. The voltage response to the set is measured and the correction factor is calculated by using each voltage response to the set.

Abstract: A method and system of thermal effect and off-center load compensation of a sensor are disclosed. In one embodiment, a sensor includes a first conductive surface and a second conductive surface substantially parallel to the first conductive surface, a processing and communication zone of the first conductive surface and the second conductive surface having circuitry to enable communication with an external system (e.g., using a Universal Serial Bus (USB) interface) and a sensing area having partially a ceramic substrate surrounding a sensor surface and a reference surface of the first conductive surface and the second conductive surface. The sensor may include a set of electrical leads that enable the sensing area to communicate with the processing and communication zone and with external devices, and a guard ring surrounding the first conductive surface and the second conductive surface to minimize an effect of stray capacitance.

Abstract: The present invention relates to a system for measuring a capacitor (C). A current source (12) is connected in parallel to the capacitor (C) between a supply plane (Vc) and ground (VGND) for providing a current to the capacitor (C). A voltage level-shift is connected between the supply plane (Vc) and the ground (VGND) in parallel to the capacitor (C) and in parallel to the current source (I2). The voltage level-shift senses a voltage across the electronic component (C) and provides a level-shifted output voltage Vout in dependence thereupon. The voltage level-shift comprises a resistor (RI) connected in series with a current source (II) and an output port interposed between the resistor (RI) and the current source (I,). The current sources (I,) and (12) have opposite temperature coefficients such that the current provided to the electronic component is substantially constant.

Abstract: An angle measuring device for optical angle measurement has a telescope body which is rotatably mounted around at least one shaft (1, 2; 11), wherein the shaft (1, 2; 11) is rotatably mounted at least two bearing points 6, and the bearing points 6 are at a distance from one another in the direction of the shaft (1, 2; 11). In this case, at least two sensor arrangements for detecting the position of the shaft (1, 2; 11) are respectively arranged at a measurement point along the shaft (1, 2; 11), wherein the measurement points are at a distance from one another in the direction of the shaft (1, 2; 11). At least one of the sensor arrangements has a group of capacitive sensors (7a, 7b, 7c, 7d) which detect a displacement of the shaft (1, 2; 11) in directions perpendicular to the axial direction at the measurement point.

Abstract: A fluid quality sensor includes a first electrode (24) that has a fluid passageway (22) that is adapted to be placed in line with at least one fluid conduit (30). A second electrode (40) is supported within the fluid passageway (22) and electrically isolated from the first electrode (24). The first electrode (24) and the second electrode (40) operate as a capacitor for making fluid quality determinations. A disclosed example includes a temperature sensor (50) thermally coupled with a mounting member (42) that supports the second electrode (40) within the first electrode 24. A disclosed example includes a multiple piece first electrode that allows for at least a portion of the second electrode (40) to be exposed and accessible near one end of at least one piece of the first electrode during a selected portion of an example assembly process.

Abstract: An integrated circuit temperature sensor includes a sensor to determine whether the integrated circuit is currently exposed to a relatively low or high temperature. A measured voltage across the base-emitter of a bipolar transistor is selected if the sensor indicates exposure to the relatively low temperature or, a measured delta voltage across the base-emitter of the bipolar transistor is selected if the sensor indicates exposure to the relatively high temperature. The voltage across the base-emitter is compared against a first reference for determining exposure to a too cold condition or the selected measured delta voltage across the base-emitter is compared against a second reference for determining exposure to a too hot condition. In a test mode, the measured delta voltage across the base-emitter and/or the measured voltage across the base-emitter are scaled.

Abstract: A technique for reducing a parasitic DC bias voltage on a sensor monitors the parasitic DC bias voltage on a first element of the sensor. A controlled bias voltage that is applied between the first element of the sensor and a second element of the sensor is then modified to substantially maintain the parasitic DC bias voltage at a desired potential.

Abstract: The present method generates a greater number of hot holes than those generated by normal write/erase operations, thereby making it possible to evaluate an operation of a non-volatile memory with respect to hot holes. The present method performs a write operation to the non-volatile memory at lower temperatures than normal temperatures at normal use or/and at a lower operation voltage than a normal operation voltage at normal use, so as to generate a greater number of hot holes than those generated by normal write/erase operations between floating gates and drains of the memory, and then evaluates the operation of the memory while exposing it to the normal operation temperatures. This method is applicable to reliability tests of non-volatile memories such as FLASH memories.

Abstract: A method for the temperature compensation of a resistance measuring bridge, such as in particular a Wheatstone bridge, is characterized in that a capacitor positioned between the input circuit and a resistance switching circuit of the Wheatstone bridge is successively discharge by means of at least one Wheatstone bridge resistor. In a device for the temperature compensation of a measuring bridge, particularly a Wheatstone bridge, having a measuring bridge and a compensating resistor in the input circuit, one or two switches are located in the resistance switching circuit branch of the measuring bridge as a contact point with the latter and a capacitor is located between the input circuit and the resistance switching circuit branch.

Abstract: A microcontroller-based temperature compensated circuit for ground-fault circuit interrupter to meet the requirements of UL 943 using a single sensor to detect both ground-fault and grounded-neutral fault conditions in both full-wave and half-wave AC power supplies as part of a ground-fault circuit breaker or a receptacle device.

Abstract: Methods and systems using Pade' Approximant expansion ratios provide mappings between nonlinear sensors and a more linearized output domain. In one embodiment (a) a variable gain amplifier receives a supplied input signal, the amplifier has at least a first input terminal, an output terminal, and a gain control terminal; (b) a first summer coupled to the output terminal of the variable gain amplifier adds in a first offset signal; (c) a first multiplier coupled to an output of the first summer receives a proportional feedback factor signal and correspondingly generates a multiplied feedback; (d) a second summer coupled to an output terminal of the first multiplier adds in a corresponding second offset signal; and (e) a second multiplier coupled to an output of the second summer receives a gain factor signal and generates a multiplied gain signal; where the gain control terminal of the variable gain amplifier is operatively coupled to an output terminal of the second multiplier.

Abstract: Method and system for periodically measuring the junction temperature of a semiconductor device. The junction is excited by at least two sequential predetermined currents of different magnitudes. The voltage response of the junction to the at least two currents is measured and the temperature of the junction is calculated, while substantially canceling ohmic effects, by using the voltage response and a correction factor. Whenever desired, the junction is excited by a set of at least four sequential different currents having known ratios. The voltage response to the set is measured and the correction factor is calculated by using each voltage response to the set.

Abstract: An engine oil deterioration detection apparatus includes a sensing capacitor CS formed of paired electrodes dipped into engine oil whose deterioration is to be detected, the engine oil deterioration detection apparatus detecting deterioration of the engine oil on the basis of a change in electrostatic capacitance of the sensing capacitor CS. A measurement signal generation circuit generates a measurement signal to be supplied to the sensing capacitor CS. A detection signal output circuit outputs a detection signal on the basis of a response wave signal produced from the sensing capacitor CS in response to supply of the measurement signal thereto, the detection signal reflecting the electrostatic capacitance of the sensing capacitor CS. A temperature compensation mechanism is provided to compensate for a level change of the detection signal stemming from a temperature characteristic and/or a time-course deterioration of the detection signal output circuit.

Abstract: A sensor (40) includes a single capacitor (42) that operates in two different modes to obtain capacitance and conductance information when a mixture flows between the electrodes (44, 46) of the capacitor. The inventive sensor is particularly well-suited for making methanol content determinations within a mixture used to provide hydrogen to supply a fuel cell. Two different oscillators (180, 182) are selectively used to obtain the conductance and capacitance information. In a disclosed embodiment, a capacitor includes an outer electrode (44) that is received around an inner electrode (46) such that there is a spacing between the electrodes through which the mixture flows. The mixture acts as a dielectric of the capacitor allowing the conductance and capacitance measurements to be made. The example sensor includes a temperature sensor (76) conveniently supported within the inner electrode (46).

Abstract: Electronic device for monitoring the temperature of a medium ensures that the temperature has not reached pre-established index limit values. The device includes contacts for closing an electric charge flow circuit when the temperature reaches an index limit value, an electric charge storage component connected to the charge flow circuit when the contacts close, the charges remain stored as long as the temperature does not reach one of its index limit values, and is able to flow through the charge flow circuit when the circuit is closed by the contacts, the charge storage not returning to the charge state which they had before the charge flow circuit closed if the latter opens again, and a provision for reading enabling the charge state to be determined.

Abstract: An oscillating device to determine the purity of single or multi-component liquids on the basis of their dielectric permittivity, in a continuous procedure through the frequency change in the static permittivity region and with strict temperature control. The oscillator is connected to a standard thermoregulated measuring cell, a frequency meter and a power source. The improved characteristic is that the circuit does not contain the usual micrometer and standard capacitors and that it has a previously determined inductance to improve measurement conditions. In this manner, and operating in the region of static frequencies to avoid relaxation phenomena, a continuous measurement is achieved with a high degree of precision that had never been previously obtained. A measurement procedure is also disclosed that is carried out with the device.

Abstract: A temperature controlled high voltage regulator for automatically adjusting the high voltage applied to a radiation detector is described. The regulator is a solid state device that is independent of the attached radiation detector, enabling the regulator to be used by various models of radiation detectors, such as gas flow proportional radiation detectors.

Abstract: Disclosed is a bit rate discrimination device that accurately discriminates a bit rate regardless of variations in the operating temperature. A photoelectric converter converts an input optical signal into an electric signal, and a bit rate detector detects a bit rate of the optical signal from the electric signal and outputs a discrimination signal indicating the bit rate. A DC amplifier outputs a bit rate detection signal by amplifying the discrimination signal, and a temperature detector detects the operating temperature of the DC amplifier and outputs a temperature signal indicating the detected operating temperature. A variation amplifier outputs a temperature compensation signal by amplifying the voltage level difference between the temperature signal and a predetermined reference signal, so as to cancel variations in an output voltage of the DC amplifier according to the operating temperature.

Abstract: A two-stage circuit configured to control the temperature of a device, having: a first stage connected to the device for controlling the temperature of the device; and a second stage having a temperature sensor and a heat source associated with the first stage for controlling the temperature of the first stage. An apparatus and method for controlling the temperature of an optical, electrical, or electronic device, or other analogous device provides a greater degree of control, i.e. control within a narrower band than is currently possible, by utilising a second stage of control associated with the first stage of control.

Abstract: Apparatus are provided for measuring coating thickness. The apparatus include first and second inductors, which may be coils, and measuring the impedance of conductors by passing alternating current through the conductors. The conductors are arranged so that the first inductor may be positioned sufficiently close to a conductive surface so that its impedance changes and, when so positioned, any change in the impedance of the second inductor brought about by the surface is negligible compared to that in the impedance of the first. A microprocessor is provided and arranged to calculate a temperature compensated thickness measurement from the measured impedances of both inductors.

Abstract: A temperature compensated pressure sensor network for providing an output sensing signal representative of an applied pressure includes a reference oscillator circuit for providing a reference signal having an associated reference frequency. The oscillator circuit includes a first inductor pair electrically coupled in series, wherein the reference frequency is a predetermined function of a first inductance associated with the first inductor pair. The sensor network further includes a sensor circuit for providing a sensing signal having an associated sensing frequency. The sensor circuit includes a second inductor pair and a sensing capacitor electrically coupled in series, wherein the sensing frequency is a predetermined function of a second inductance associated with the second inductor pair and the applied pressure. The sensor network also includes a processor for receiving the reference signal and the sensing signal, and producing the output sensing signal.

Abstract: The invention relates to a method for temperature compensation of an LC oscillator (8) having a machining head (4) and serving for the capacitive measurement of a distance between the machining head (4) and a workpiece (7), in which an output signal (S) of the LC oscillator (8) is transmitted to an evaluation unit (2) arranged separately from the machining head (4). The temperature (T) of the LC oscillator (8) is measured with the aid of the temperature sensor (29) and supplied to the evaluation unit (2). In the evaluation unit (2), temperature compensation of the output signal (S) of the LC oscillator (8) is effected using the measured temperature (T) and a temperature coefficient (K) which is assigned to the machining head (4) and can likewise be transmitted from the machining head (4) to the evaluation unit (2).

Abstract: A monolithic sensor includes a reference channel and at least one sensing channel. Each sensing channel has an oscillator and a counter driven by the oscillator. The reference channel and the at least one sensing channel being formed integrally with a substrate and intimately nested with one another on the substrate. Thus, the oscillator and the counter have matched component values and temperature coefficients. A frequency determining component of the sensing oscillator is formed integrally with the substrate and has an impedance parameter which varies with an environmental parameter to be measured by the sensor. A gating control is responsive to an output signal generated by the reference channel, for terminating counting in the at least one sensing channel at an output count, whereby the output count is indicative of the environmental parameter, and successive ones of the output counts are indicative of changes in the environmental parameter.

Abstract: A temperature compensated power detector generally comprises a detector circuit portion, which includes a detector diode, and a temperature compensation circuit portion, which includes a temperature compensation diode, that is operably connected to the detector circuit portion. The detector diode and the temperature compensation diode are connected in DC series with each other and develop substantially identical voltage drops. The detector circuit portion operates to detect a voltage from a power input. However, the detected voltage is subject to alteration due to temperature variations. The temperature compensation circuit portion develops a voltage that is also subject to alteration due to temperature variations. The temperature altered voltage of the temperature compensation circuit portion is used to cancel out the temperature altered voltage of the detector circuit portion allowing the power detector to produce a true voltage output.

Abstract: Temperature compensation in the context of capacitive distance measurement with the aid of an LC oscillator The invention relates to a method for temperature compensation of an LC oscillator (8) having a machining head (4) and serving for the capacitive measurement of a distance between the machining head (4) and a workpiece (7), in which an output signal (S) of the LC oscillator (8) is transmitted to an evaluation unit (2) arranged separately from the machining head (4). The temperature (T) of the LC oscillator (8) is measured with the aid of the temperature sensor (29) and supplied to the evaluation unit (2). In the evaluation unit (2), temperature compensation of the output signal (S) of the LC oscillator (8) is effected using the measured temperature (T) and a temperature coefficient (K) which is assigned to the machining head (4) and can likewise be transmitted from the machining head (4) to the evaluation unit (2).

Abstract: Hall ICs constituting a redundant throttle valve position sensor are used to measure a rotational angle value indicative of a position of a throttle valve and a temperature value indicative of an ambient temperature change, which is continuously monitored, around the Hall ICs. The rotational angle value measured by the Hall ICs is appropriately adjusted based on the measure temperature value of its own, and a throttle valve position is determined in an externally connected ECU based on the adjusted angle value. In addition, the temperature value measured by one Hall IC is inputted to the ECU. In the ECU, various control values, such as a resistance value of an electric motor, can be appropriately adjusted based on the measured temperature value.

Abstract: A process and a system for the operation of a resistive moisture sensor, in particular on the windshield of a motor vehicle, wherein the conductivity of the moisture sensor is measured shortly after a sudden change in a signal fed to the moisture sensor and measured at at least one later time. Information as to the nature and degree of the dirtying of the windshield is obtained by the measured values.

Abstract: The capacitance type acceleration sensor disclosed is one in which a variation in a distance between first and second electrodes caused by acceleration is measured as an electrostatic capacity variation. The acceleration sensor includes a fixed electrode, a movable electrode and a reference electrode. The fixed electrode constitutes the first electrode or the second electrode, and a movable electrode constitutes the other of the first or second electrodes. The reference electrode is such that its distance with respect to the first and second electrodes is not caused to be changed by acceleration. The fixed electrode and the movable electrode are disposed in an overlapping position in a direction in which the acceleration is detected. Thus, it is possible to scale down the sensor chip area by the magnitude of the area of the reference electrode.

Abstract: In a capacitive sensor system, first and second driving signals opposite in phase are applied to a sensor capacitor and a reference capacitor, respectively, which are both connected to a switched capacitor circuit. An output signal of the switched capacitor is sampled by two sample-and-hold circuits which are operated in different phases of the driving signals. A differential amplifier generates a sensor signal in response to the difference in potential between the outputs of the sample-and-hold circuits.

Abstract: The electrodes of an electrostatic capacitor which is used to determine the alcohol concentration in a mixture of gasoline and alcohol, are connected with a frequency oscillator of the LC type which applies a signal having a frequency which is equal to or greater than 10 MHz. The setting of the oscillation frequency to 10 MHz or more eliminates the amount of change in electrode loss and enables stable and accurate alcohol concentration determination.

Abstract: A device is provided for measuring dielectric constant and conductance of a material such as massecuite, the device including a pair of electrodes which are switchably connected to a tank circuit which includes a variable frequency oscillator operating at radio frequencies, and two reference frequencies are measured with the electrodes disconnected from the oscillator and two measurement frequencies with the electrodes coupled to the oscillator tank circuit, the differences between the reference and measurement frequencies being used to compute the inductance and dielectric constant or composition of the material. The frequency is modified by not more than about 10 MHz and may be achieved either by switchably introducing additional inductance or capacitance into the tank circuit to modify its frequency or by having the electrodes switchable between a pair or oscillators operating at known radio frequencies.