Abstract: The accelerometer of the present application includes: a main body; a channel positioned in the main body and forming a predetermined movement space; a conductive droplet positioned in the movement space and moving in the movement space according to inertia; a conduction section correspondingly positioned to the movement space and coming in contact with the conductive droplet; and a resistance measurement section connected to the conduction section and measuring the electric resistance of the conduction section.

Abstract: In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented, and the reliability of the knock sensor is improved. The engine includes a crankcase, a cylinder block connected to the crankcase, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, and a knock sensor mounted to the boss. Fins are provided on the cylinder block and the cylinder head. A heat insulation member is provided between the boss and the knock sensor.

Abstract: A round-robin sensing device is disclosed. The round-robin sensing device comprises a MEMS device, wherein the MEMS device includes first and second sense electrodes. The round-robin sensing device also comprises a multiplexer coupled to the first and second sense electrodes, at least one sense amplifier coupled to the multiplexer, a demodulator coupled to the at least one sense amplifier, and an integrate and dump circuit coupled to the demodulator. Finally, the round-robin sensing device comprises an analog-to-digital converter (ADC) coupled to the de-multiplexer, wherein the multiplexer, the at least one sense amplifier and the demodulator provide a continuous time sense path during amplification that is resettable and wherein the integrate and dump circuit and the ADC provide a discrete time processing path.

Abstract: A fluid supply system configured for metering two or more fluids in controlled proportions, including a plurality of solvent supply lines, a pumping unit configured for taking in fluids from selected solvent supply lines and for supplying a pressurized mixture, a proportioning valve configured for modulating solvent composition by sequentially coupling selected ones of the solvent supply lines with the inlet of the pumping unit, a sensor configured for sensing process information in the fluid supply system, an analysis entity configured for analyzing the process information for determining reciprocating element related information at a beginning of fluid intake, and a control unit configured for switching the proportioning valve to sequentially couple selected ones of the solvent supply lines to the inlet of the pumping unit at one or more switching points based on the given metering scheme and based on the reciprocating element related information.

Abstract: In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented and the reliability of the knock sensor is improved. The engine includes a crankcase accommodating a crankshaft, a cylinder block connected to the crankcase and including a cylinder provided therein, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, a knock sensor arranged to detect knocking and mounted to the boss, a fan to guide air to at least the sensor mounting boss, and an air shroud.

Abstract: This document discusses, among other things, an inertial measurement system including a device layer including a single proof-mass 3-axis accelerometer, a cap wafer bonded to a first surface of the device layer, and a via wafer bonded to a second surface of the device layer, wherein the cap wafer and the via wafer are configured to encapsulate the single proof-mass 3-axis accelerometer. The single proof-mass 3-axis accelerometer can be suspended about a single, central anchor, and can include separate x, y, and z-axis flexure bearings, wherein the x and y-axis flexure bearings are symmetrical about the single, central anchor and the z-axis flexure is not symmetrical about the single, central anchor.

Abstract: A standing wave amplification device for vibration signal collection includes a sensing rod (11) acting as standing wave transmission medium. A standing wave formation device includes two fixing support devices (12) distributed along the axial direction and connecting the sensing rod (11) to an operating arm (14). The two fixing support devices (12) respectively collect vibration waves and transmit them to the sensing rod (11) from two different locations of the operating arm (14). The vibration waves are superimposed to form a standing wave on the sensing rod (11). A vibration sensor (13) is connected to the sensing rod (11) and the vibration sensor (13) is between the two fixing support devices (12). A wave detected by the vibration sensor (13) is the standing wave. Compared with transverse wave or longitudinal wave transmitted in the transmission medium of prior art, the standing wave has advantages of larger amplitude and more obvious vibration effect.

Abstract: An instrument (10) for gravimetrically determining moisture content has a housing (20), with a weighing device (40) arranged inside. The weighing device (40) has a load receiver (60) onto which a sample (62) is placed. The housing has a stationary housing part (21) and a movable housing part (22), the movable housing part alternately occupying a measuring position and a loading position. In the loading position, the respective housing parts are spaced apart from each other, allowing a sample to be put on the load receiver. In the measuring position, the respective housing parts form an essentially enclosed testing compartment (30) that surrounds the load receiver. A means (70), arranged in the testing compartment, heats a sample that is placed on the load receiver. The movable housing part is moved between the respective positions by a position-changing device.

Abstract: A physical quantity sensor includes a base substrate, a movable part located on the base substrate and provided on a principal surface of the base substrate, a movable electrode part provided in the movable part, and a fixed electrode part provided on the principal surface of the base substrate and located to be opposed to a movable electrode finger, and the fixed electrode part is connected to fixed electrode wiring provided at the principal surface side of the base substrate, the movable electrode part is connected to movable electrode wiring provided at the principal surface side of the base substrate, and a shield part is provided between the fixed electrode wiring and the movable electrode wiring.

Abstract: A microelectromechanical nanoindenter including a body, a probe moveable relative to the body, an indenter tip coupled to an end of the moveable probe, and a micromachined comb drive. The micromachined comb drive includes an electrostatic actuator capacitor configured to drive the probe, along with the indenter tip. The micromachined comb drive includes a plurality of sensing capacitors forming a differential capacitive displacement sensor, each sensing capacitor comprising a plurality of comb capacitors and each configured to provide capacitance levels which, together, are representative of a position of the probe, wherein each of the comb capacitors of the actuator capacitor and the sensing capacitors includes a fixed electrode comb coupled to the body and a moveable electrode comb coupled to the probe.

Abstract: An automatic sonic/ultrasonic data acquisition system for collecting data from concrete railroad ties. The system has a frame, a wheel carried by the frame and constructed and arranged to rotate relative to the frame such that the wheel can roll along the top of a rail, an axle suspended from the frame and adapted to be rotated relative to the frame via rotation of the wheel, one or more sensors coupled to the axle and constructed and arranged to contact the ties as the frame is moved along the rails, and an energy source for initiating in the ties compressional and/or shear/Rayleigh waves that are sensed by the sensors.

Abstract: The present invention provides a dynamic quantity device which reduces stress received by a sensor due to resin packaging and reduces variation in sensor characteristics due to stress. The dynamic quantity sensor includes a semiconductor substrate including a fixing part and a flexible part and a movable part positioned on an interior side of the fixing part, and a cap component configured to cover the flexible part and the movable part, wherein the fixing part includes an interior frame configured to enclose the flexible part and the movable part and an exterior part positioned on a periphery of the interior frame, a slit configured to divide the interior frame and the exterior frame, and a linking part configured to link the interior frame and the exterior frame.

Abstract: A method for identifying possible damage in a toothed transmission stage having at least one pair of engagement toothed wheels includes measuring with a vibration transducer an oscillation signal corresponding to oscillations produced by a rolling and impact motion when teeth of a pair of the toothed wheels mesh under load during operation of the transmission stage, comparing the oscillation signal with a calibration oscillation signal, determining a torque acting on the transmission stage from a difference between the oscillation signal and the calibration oscillation signal, and evaluating the measured oscillation signal commensurate with the determined torque to identify the possible damage to the transmission stage.

Abstract: A method for the measurement of pressure in high temperature and high pressure processes includes the steps of providing at least a first material compound and at least a second material compound. The at least first and second compounds are mixed to form a material sample. The material sample is loaded into a device and the device and material sample are subjected to a high pressure of up to about 10 GPa and a high temperature of up to about 2000° C. to form the material sample into a solid crystalline solution. The material sample is recovered for analysis and the composition of the crystalline solid solution is measured to determine the pressure ex situ.

Abstract: A multi-dimensional liquid analysis system includes a flow splitter for separating mobile phase outflow from a first dimension liquid analysis system into first and second liquid split outlet flows. Volumetric flow rate control of the split outlet flows is provided by a flow control pump which withdraws one of the split outlet flows from the flow splitter at a controlled withdrawal flow rate to define the other split outlet flow rate as the difference between the outflow rate from the first dimension system and the withdrawal flow rate. In this manner, accurate and consistent flow division can be accomplished, which is particularly useful for multi-dimensional liquid analysis.

Abstract: Evaluating ground surface hardness for a site involves using a mobile data collection device to automatically drop an object including an accelerometer onto a ground surface at sample locations spaced at regular intervals within the site. The acceleration of the object is detected with the accelerometer as the object impacts the ground surface at the sample locations. A value is generated representative of ground surface hardness for each of the sample locations. Evaluation using a handheld hardness measurement device is also disclosed.

Abstract: In comb drive vibratory gyroscopes, drive-induced Coriolis accelerometer offset is effectively canceled by demodulating the output during equal times of in-phase and anti-phase drive of the shuttle with respect to the velocity signal used for angular rate demodulation. This reduces or eliminates the corresponding thermal and die-stress effects otherwise needing calibration.

Abstract: A micromechanical component including a mass structure which may be deflected with respect to a substrate with the aid of at least one spiral spring in a direction of deflection. The spiral spring includes at least one folding section, which is formed by two spring legs which are situated essentially in parallel to each other and are connected to each other with the aid of a connecting bar. A damping device for oscillating movements of the folding section in the direction of deflection is provided in the area of the connecting bar.

Abstract: Disclosed herein is an inertial sensor, including: a membrane; a mass body disposed under the membrane; a sensing unit formed on the membrane and including a piezoelectric body; and a spring constant control unit formed to be spaced apart from the sensing unit and including a piezoelectric body. According to the preferred embodiment of the present invention, the DC acceleration (in particular, gravity acceleration) can be measured by using the change in the spring constant without changing the structure of the inertial sensor including the piezoelectric material of the prior art.

Abstract: There is disclosed a dual output compressive mode accelerometer having first and second output channels, comprising: a supporting base; first and second transducers mounted on the supporting base adjacent to one another, each transducer comprising a piezoelectric element and a seismic mass, the piezoelectric element positioned between the supporting base and the seismic mass; and a rigid mechanical coupling between the first and second transducers, the rigid mechanical coupling coupled to both of the first and second transducers above the supporting base.