Abstract: A monitoring device for detecting acoustic vibrations in monitored objects has a plurality of several structure-borne sound sensors which are connected to a remote central electronic analyzing system. The individual structure-borne sound sensors are each acoustically coupled with a self-testing unit, which can be activated from the central electronic analyzing system. Activation of the self-testing units is performed by modulation of an operating voltage supplied to structure-borne sound sensors, without additional electric connections to the electronic analysis system.

Abstract: A new Fire Alarm Safety Silencing System for providing a fire alarm which allows a user to silence during false alarms for a finite period of time wherein the fire alarm rearms itself. The inventive device includes a fire alarm having a receiver a transmitter for transmitting a signal to the receiver of the fire alarm for deactivating the fire alarm for a finite period of time during a false alarm, and a length of Velcro and a length of magnet secured to the transmitter for conveniently attaching to a metal surface.

Abstract: A system diagnoses the operability of a rotating electrical apparatus such as a reactor coolant pump (RCP) motor. The RCP motor includes a rotatable shaft, a stator, a bearing assembly and a bearing insulator. The bearing assembly electrically contacts the rotatable shaft and the bearing insulator at least partially electrically insulates the rotatable shaft and the bearing assembly from the stator. The system includes a shaft transformer and voltage source for inducing a voltage in the rotatable shaft; a variable resistor in parallel with the bearing insulator having first and second resistances; an analog-to-digital converter for sensing a first voltage associated with the first resistance and a second voltage associated with the second resistance; and means for determining the operability or the impedance of the bearing insulator from the first and second voltages and the second resistance.

Abstract: A set of first and second detecting units detects an emergency. First and second pseudo-emergency generating units generate a pseudo-emergency for the first and second detecting units. A driving unit alternately drives the first and second pseudo-emergency generating units. An abnormality detecting unit detects operation of the first and second detecting units detecting the pseudo-emergency from the first and second pseudo-emergency generating units, the abnormality detecting units performing a predetermined indication when thus-detected operation is abnormal. An emergency detection outputting unit, in an emergency, outputs an emergency detection signal in response to reception of emergency detection signals from both the first and second detecting units.

Abstract: The present invention provides a calculated protective action zone, such as a safety zone which can be used for evacuation purposes, using simplified input methods and systems and simplified internal calculation methods to model the chemical data. Yet, it uniquely retains a significantly high degree of accuracy corresponding to more expensive, complicated, time consuming state of the art models for the chemical releases as described above. It may be used for dense gas dispersion and other releases. To accomplish this, the methods and systems of the present invention may use a post-processed modeled data base and selected multi-variable equations combined with qualitative and quantitative input and may include default values for various factors. The system may include a small, hand-held electronic calculating element such as a palmtop computer, with extended battery life for portability, although it is equally applicable for high end processors on stationary computers.

Abstract: A smoke detector is provided with testing apparatus for determining if its sensitivity is within a predetermined acceptable range. The testing apparatus stores in the detector a range representing acceptable sensitivities. When a test is initiated the resulting test output is compared to the sensitivity range, or its representation, and a warning signal is provided when the output is not acceptable. According to one feature, the stored representations of the acceptable range include a maximum acceptable value and a minimum acceptable value, and the warning signal indicates when the output is above the maximum or below the minimum. According to other features, the output signal is periodic at one frequency when above the maximum and at another frequency when below the minimum. The test is initiated by a magnetic reed switch and the results are immediately apparent.

Abstract: In a security system having a remote monitoring station, a sensor is tested when the security system is in a normal operating mode. The sensor is tested by actuation of a button on the sensor. Actuation of the button generates a signal indicating that a test has been conducted. Upon the generatation of both an alarm signal generated by the test and a signal indicating that a test has been conducted, the security system determines that the alarm signal was generated by a test of the sensor and not by the detection of alarm conditions by the sensor.

Abstract: A detector testing device which provides consistent, cost-effective, repeatable results. The testing device is primarily constructed of PVC plastic and other non-metallic materials. Sensitivity of a walk-through detector system can be checked by: 1) providing a standard test object simulating the mass, size and material content of a weapon or other contraband, 2) suspending the test object in successive positions, such as head, waist and ankle levels, simulating where the contraband might be concealed on a person walking through the detector system; and 3) swinging the suspended object through each of the positions, while operating the detector system and observing its response. The test object is retained in a holder in which the orientation of the test device or target can be readily changed, to properly complete the testing requirements.

Abstract: Apparatus for testing the sensitivity of a smoke detector (12) in-situ, including a head assembly (1) comprising a housing (14) for surrounding a smoke detector in-situ and forming part of a sensing loop (14, 15, 16, 17)through which air carrying an aerosol will circulate, a sensor (25, 26, 27) for sensing the concentration of aerosol in the air circulating in the loop, a fan (20) for causing air to circulate in the loop, an aerosol container (24) for supplying aerosol to the loop and a control unit 2 for controlling the concentration of aerosol in the air circulating in the loop by controlling the fan (20) and the aerosol container (24) in response to the output of the sensor.

Abstract: A fire sound simulator includes a random sequencer which produces random signals. The sequencer is connected to a sound synthesizer which transforms the sequencer's signals into random sounds. The synthesizer is in turn connected to a speaker which receives the sounds from the synthesizer for outputting the sounds. The simulator alternatively includes a recording stored on a ROM chip. The simulator may be activated by a light sensitive switch.

Abstract: A self-testing device is provided for a monitoring system for monitoring whether a closure member such as a door or window is closed. The monitoring system includes a switch unit mounted on the frame of the closure member being monitored and including magnetically biased switches connected in one or more electrical monitoring circuits, and a door magnet unit mounted on the closure member being monitored. The door magnet includes one or more permanent magnets that produce a magnetic field which, when the closure member is closed, cause said switches to assume a first state. When the closure member is opened, the switches switch to a second, alarm state. The self-testing device is electrically controllable from a remote location and produces a canceling or diverting magnetic field which simulates the effect of movement of the closure member from the closed position thereof without any actual movement of the member.

Abstract: A photoelectric type fire detector is capable of accurately adjusting sensitivity using a scattering and translucent plate and exhibits excellent reliability.

Abstract: A method and apparatus for safely and conveniently testing heat detectors mounted at an elevated location above a ground surface. A package containing a composition formulated to react exothermically but non-flammably upon exposure to ambient air sustains a temperature sufficient to activate the heat detectors under feet for a period of at least a few minutes. The package is placed in a holder supported on a long handle for raising the package into close proximity to the heat detector. After initiating the exothermic reaction, as by tearing an envelope containing the reactive composition, an operator standing on the ground under the heat detector elevates the package into contact with or close proximity to the heat detector.

Abstract: A monitoring apparatus for an alarm device for situations wherein the alarm device is provided at a location remote from the alarm device drive side, which can verify from the alarm device drive side if an audible alarm has sounded. The drive of the alarm device (1) is stopped by switching off a drive switch (12) on the alarm device drive side (A). After stopping the drive of the alarm device (1) an audible alarm generation sensed signal from the response device (2) on the alarm device side (B)is received at the alarm device drive side (A) though the feeder (a). Then, after the audible alarm generation sensed signal has stopped, and on receipt of a verification signal verifying that the alarm device drive side (B) has returned to the original condition, a verification output (F3) for the audible alarm generation is generated at the alarm device drive side (A).

Abstract: A self-diagnostic circuit for an emergency lamphead is disclosed that is effective during standby operation of the lamphead to indicate whether the lamphead is capable of operating in an emergency mode. The self-diagnostic circuit includes a high-impedance circuit path connected in series with the lamphead and including an indicator, such as an LED, which is energized by a battery current passing through the circuit path and lamphead during the standby mode operation. The battery current is insufficient to illuminate the lamphead, but is sufficient to energize the LED whenever proper electrical continuity exists through the lamphead. A second high-impedance circuit path may be connected in parallel with the lamphead, in order to energize a second LED when proper continuity does not through the lamphead.

Abstract: A smoke alarm device including self-test reminder circuitry is provided. The smoke alarm includes smoke detection circuitry and a smoke sensor, the functionality of which may be tested using a test switch connected in parallel across the smoke sensor. Additionally, a reminder circuit is provided, the output of which may be used to enable an indicator. The indicator may be the horn or annunciator of the smoke detector, or may be some other type of indicator, such as a light or other audible indicator. Periodically, the reminder circuit will cause the indicator to become enabled so as to remind the consumer to test the smoke alarm. The indicator will remain enabled until the reminder circuit is manually reset by the consumer. Actuation of the test switch simultaneously tests the functionality of the smoke detection circuitry and resets the reminder circuit.

Abstract: A garage door operator which senses obstructions and takes corrective action before entrapment can occur. Yieldable gears are utilized as a failsafe mechanism such that when the applied torque exceeds certain limit, the gears disengage so that the garage door can be manually moved. The yieldable gears may also be disengaged by remote control or by hand. Solid state circuitry is provided to achieve soft starts and stops of the electric motor. Test circuitry is provided that tests the operational readiness of the electrical components by simulating an abnormal torque condition. During operation of the electric motor, the torque load is electronically calculated and if an abnormal torque load is encountered, the electric motor reverses direction.

Abstract: A smoke detector is provided with testing apparatus for determining if its sensitivity is within a predetermined acceptable range. The testing apparatus stores in the detector a range representing acceptable sensitivities. When a test is initiated the resulting test output is compared to the sensitivity range, or its representation, and a warning signal is provided when the output is not acceptable. According to one feature, the stored representations of the acceptable range include a maximum acceptable value and a minimum acceptable value, and the warning signal indicates when the output is above the maximum or below the minimum. According to other features, the output signal is periodic at one frequency when above the maximum and at another frequency when below the minimum. The test is initiated by a magnetic reed switch and the results are immediately apparent.

Abstract: A security system for monitoring an area under surveillance includes a transmitter for generating radio frequencies (RF) signals when actuated using an actuator. A sensing station receives the RF signals from the transmitter. A monitoring station generates video signals of the area under surveillance and provides one end of a duplex audio communications system. A control station, coupled to the sensing station and the monitoring station, actuates the monitoring station in response to the RF signals sensed by the sensing station. The control station includes an opposite end of the duplex audio communications system and a display for displaying the video signals.

Abstract: The present invention relates to a device and method for testing circuitry, such as that provided in an alarm system. The present invention tests the circuit by providing a momentary or a continuous trigger. The testing device of the present invention is connectable by two jacks to test leads from the circuit being tested, and the circuit alarm is triggered by a relay switch either connecting or disconnecting the two jacks. The present invention additionally includes a control circuit with a power supply and a relay coil for controlling the relay switch, along with a further switch to provide two operational modes, each capable of triggering either a momentary or a continuous alarm.

Abstract: For testing or/and adjusting a scattered-light smoke detector as to sensitivity to smoke, a transparent body with included scattering centers is introduced into the measurement volume of the detector. Aluminum oxide powder particles can serve as scattering centers. The distribution of light scattering centers is preferably uniform, and their concentration chosen to simulate a smoke density corresponding to the alarm threshold of the smoke detector. Thus, scattered-light smoke detectors are readily calibrated to a desired output signal as a function of smoke density. With a different density of scattering centers, the technique can be used for testing scattered-light smoke detectors in the field. If the scattering centers are distributed outside a measurement volume of an uncontaminated detector, the technique can be used for testing as to contamination.

Abstract: An apparatus for testing the operation of an irrigation system is disclosed. The apparatus pinpoints defects in the irrigation system controller by simulating control signals and processing the control signals through controller output chips. Visual indicators offer an indication of defects in output chips. The apparatus may be coupled to the controller and receives potential from the controller. The potential is converted to produce a signal for operating the tester. An oscillator/clocking section produces serial data input, strobe pulse, and clock pulse signals to simulate signals produced by the controller microprocessor. These signals operate the visual indicators and are simultaneously processed through the controller output chips. Defects low in the output chips prevent the operation of visual indicators. The absence of an operating visual indicator represents a defect in the output chips.

Abstract: A smoke detecting apparatus for a fire alarm has: a smoke chamber into which smoke to be detected is introduced, a light emitting lamp disposed in the smoke chamber, a light receiving element disposed in the smoke chamber so as to receive the light emitted from the light emitting lamp, an A/D converting circuit for converting the output signal from the light receiving element into a digital signal, a memory for storing data therein, a computing device for storing in said memory, as first calibration data, the output data from the A/D converting circuit when the smoke chamber is filled with a first reference gas, storing in said memory, as second calibration data, the-output data from the A/D converting circuit when the smoke chamber is filled with a second reference gas, and computing a proper smoke density corresponding to the output data from the A/D converting circuit on the basis of the first and second calibration data and the output data from the A/D converter circuit, and a display device for displayin

Abstract: Detection system with receptor controlled by an emitter and having a microcontroller and a device to verify the proper functioning of the receptor which includes an additional control circuit connected to the receptor and to a terminal of the microcontroller. The microcontroller includes a generator-programmer which controls at time intervals the emission of a signal to activate the additional control circuit which forces the receptor to assume its non-conducting state, and which analyzes the corresponding instantaneous state of a node of the detector in such a manner as to prevent the control center from directing the control circuit if its instantaneous state is different from the inactive state.

Abstract: A movement detector includes a transmitter (1) and a receiver (2) of electromagnetic, acoustic or light waves, and a frequency variation demodulator (3) connected to the receiver (2) and adapted to supply a signal which is progressively variable as a function of the movement detected. The movement detector further includes an analog-digital converter (5) which transforms the demodulated signal into a digital signal, a memory (6) connected to the converter (5), and an arrangement for controlling the loading of the memory. The memory (6) continuously makes available information corresponding to a memorized threshold signal. A comparator (8) continuously compares the memorized threshold signal with the signal given off by the demodulator (3) and emits a signal when the former is less than the latter.

Abstract: A thermal dispersion flow/level switch includes a dual element probe assembly. Each element comprises an RTD sensor. The two RTD's are driven at different currents at a fixed ratio so that one RTD is self heated to establish a temperature differential. When a process product comes in contact with the heated sensor, the thermal differential is diminished. The differential is set to determine presence or absence of a process media and provide a change of contact state responsive thereto. In a flow application under no flow or low flow conditions, the RTDs will stabilize with a sufficient temperature differential which decreases in response to higher flow rates.

Abstract: A glass break simulator responds to a low-frequency sound component of the sound of breaking glass produced by striking the glass. The glass break simulator detects the low-frequency sound component and when an amplitude of the low-frequency sound component exceeds a predetermined threshold value, the simulator generates a high-frequency sound component by converting a digital representation of the high-frequency sound component into sound. The low-frequency sound component and the generated high-frequency sound component are directed at a glass break detector to test it, with the glass break detector responsive to both low and high-frequency sound components.

Abstract: An electronic thermometer for use in food and dairy processing is disclosed. The thermometer utilizes a passive trimming circuit in conjunction with high quality Resistive Temperature Devices (RTDs), along with four-wire measurement circuitry to create an extremely accurate signal so that all probes are interchangeable and require no adjustment to maintain accuracy. The current source is modulated to linearize the RTDs response over a broad temperature range. To substantially eliminate the possibility of false temperature readings, dual RTDs and redundant electronic circuitry are employed, along with a detection circuit which will blank out the display should an error be detected. To prevent undue display blanking, a rapid temperature change sensing circuit will temporarily override the display blanking feature.

Abstract: Methods and apparatus for the inspection of air cargo including passenger luggage for pressure sensitive bombs. In accordance with the method, the air cargo is placed in a pressure vessel, which is then pressure cycled between a super-ambient pressure and a sub-ambient pressure duplicating the pressure at a substantial altitude. Cycling in this manner will trigger pressure sensitive switches set to set off, or initiate a timing device to set off, a terrorist bomb. The apparatus includes a pressure vessel with large blowout ports for venting the same to the atmosphere upon an extraordinary pressure rise indicative of the detonation of an explosive charge within the chamber. Also preferably located within the chamber are sensors, typically electromagnetic noise sensors, for sensing electromagnetic radiation characteristic of a switch closure turning on current to a bomb timing device.

Abstract: A home security device is provided for simulating a television receiver which consists of a housing having an electrical circuit therein, a mechanism for electrically connecting the electrical circuit in the housing to a power source and a mechanism electrically connected to the electrical circuit in the housing for simulating the picture of the television receiver, so that a potential burglar will think someone is home watching the television receiver and not break into the home.

Abstract: A water leakage detector is disclosed herein sensitive to the presence of moisture, having an elongated sensor strip comprising a pair of conductors separated by insulation. Each conductor includes an electrode coupling with a wire lead extending via a cable to an electrical plug. A circuit housing is provided having an audible alarm operably connected to an electrical socket adapted to detachably connect with the plug. A low voltage battery and auxiliary output socket are carried on the housing and connected with the alarm and the first mentioned socket whereby the presence of moisture across the pair of sensor conductors activates the alarm. A battery test pair of electrodes is provided to manually test battery condition.

Abstract: A testing device for fire detectors comprises a resistance heating coil disposed outwardly of a clear central area and a collar located to one side of and about the resistance heating element for locating of a fire detector relative to the heating element. The heating element is of a low thermal mass and is quickly activated when connected to a power source thereby radiating heat directly to the housing of the detector. The collar is sized to position the resistance heating coil immediately adjacent the surface of the fire detector and spaced from the heat collection fin to thereby cause a rate of temperature rise within the pressure chamber of the fire detector while maintaining the heat collection fin below its activation point.

Abstract: An improved smoke detector incorporating means for verifying the detector's smoke sensitivity limits, such verification means including means for positively positioning various light reflecting surfaces to provide predetermined light reflection onto light sensing means to create simulated smoke levels.

Abstract: A device for testing support equipment for a power circuit breaker, including a breaker simulator for simulating a power circuit breaker, a connector for connecting the breaker simulator to a breaker control panel, and a switch for re-directing the functions of the breaker control panel to the simulator.

Abstract: A supervisory circuit for use with an audio intrusion detection system is disclosed. The supervisory circuit periodically generates an audio test signal which is supplied to a sounder which emits an audio test sound. The audio test sound is directed into a volume of space, in the same volume of space as which the audio intrusion detection system is directed to detect. The audio intrusion detection system detects the test sound and generates an audio test signal in response thereto. During the generation of the audio test sound, the comparing apparatus of the audio intrusion detection system is disabled. The audio test signal generated by the audio intrusion detection system is then compared to a test threshold signal. A test result signal is generated in response to the comparison with the test result signal indicative of the operability of the audio intrusion detection system.

Abstract: An electrical test set especially suited for use in correlating the fill sensor's output indication for a pressure vessel with a known vessel fill condition. The vessel may be the hydrazine fuel container for an aircraft such as the U.S. Air Force F-16 fighter aircraft. The tester enables sensor system evaluation while the vessel is yet dismounted and in the refilling and refurbishing shop. In addition to verification of known vessel fill and satisfactory operation of the vessel level sensing apparatus, the tester eliminates the variables and inconvenience attending verification of sensor system operation on the aircraft by way of a cockpit instrument. The tester is provided with external and internal electrical energy sourcing and with operator friendly controls compatible with the instrumentation system in the host aircraft.

Abstract: Device for fail-safe testing of a condition indicating device including at least one infrared sensor. The infrared sensor is connected by amplifiers to comparators which have different threshold values and have outputs connected to a microprocessor. An infrared signal transmitter is actuated by the microprocessor at periodic intervals to produce signals which are detectable by the infrared sensor. The microprocessor delivers an alarm signal if the test signal is not received by the infrared sensor within a specified period after triggering of the transmitter. The microprocessor also monitors the time occurrence of noise signals produced by the infrared sensor, and produces an alarm if no noise signals are received within a specified period. During monitoring of reception of transmitted test signals, monitoring of the noise signals is interrupted to prevent the test signal reception from being processed as a noise signal.

Abstract: An emergency lighting system includes a lighting unit having a battery which is kept in a charged condition in the presence of voltage on a power line to which the unit in connected. Upon loss of voltage, the battery is caused to discharge into a pair of flood lamps to provide emergency illumination to an area surrounding the unit. To provide for periodic testing of the unit without requiring the user to actuate a switch on the unit the system includes a radio frequency receiver in the unit which responds to signals generated by a hand-held radio frequency transmitter actuated by the user. A two stage battery charging circuit and a low voltage lamp cut-off circuit are included in the lighting unit for improved battery life.

Abstract: A circuit for detecting the occurrence of an event and for providing an output signal upon the detection of the event includes a sensor for detecting the occurrence of the event. A programmable voltage source is interconnected to the sensor for generating the output signal of a predetermined voltage value. The predetermined voltage value is generated by the programmable voltage source when the programmable voltage source is activated by the sensor. Circuitry is interconnected to the programmable voltage source for preventing identification of the preselected voltage value when the programmable voltage source is not activated by the sensor.

Abstract: Apparatus for providing integrated test circuits for a smoke detector is disclosed. The smoke detector operates such that products of combustion such as smoke and carbon monoxide cause the resistance across a sensor element to be lowered. The lowered resistance of the sensor element, in normal operation, causes a change in an associated voltage level. When the change in the associated voltage level is sufficiently large, the change is detected resulting in the generation of an alarm signal. In the present invention, a switch or button causes a circuit variation that results in a voltage level change similar to that attained when the voltage across the sensor changes as a result of the introduction of the products of combustion. Activation of the switch or button results in a generation of the alarm signal and tests the operational status of the smoke detector. A multiplicity of embodiments of the present invention are illustrated.

Abstract: An audio indicator apparatus for locating boundaries of optically divided detection zones covered by a passive infrared detection system having a collector for collecting infrared rays from the zones of an area to be monitored, and a detector for passively detecting infrared rays collected by the collector and for generating a first signal having an amplitude responsive to the rays collected by the collector, which includes a signal generator to be connected to a speaker for producing a second signal responsive to the first signal, the second signal being indicative of activity of the detection system at a point, within the area to be monitored, where an infrared radiation emitting object is moved, to locate the boundaries of the zones.

Abstract: The present invention comprises an audio alarm for providing a back-up acoustic output in response to a sensed parameter including a first audio alarm circuit having a first transducer for providing a first acoustic output in response to the sensed parameter, a second audio alarm circuit having a second transducer which provides the back-up acoustic output in response to a predetermined fault condition, and which is acoustically coupled to the first transducer. The second audio alarm circuit provides an electrical signal by converting the first acoustic output of the first transducer into an electrical signal. A detector circuit is connected to the first and second audio alarm circuits and responds to the sensed parameter and to the electrical signal from the second audio alarm circuit to provide the predetermined fault condition by interpreting the electrical signal from the second audio alarm circuit.

Abstract: The invention relates to a method and apparatus for testing the response of a stress wave sensor to check that the transducer and amplifier are working satisfactorily.A pulse generator is connected to the stress wave sensor at a point between the transducer and the amplifier. The pulse generator supplies an electrical pulse to the stress wave sensor. A pulse cancelling device prevents the electrical pulse going directly to the amplifier. The electrical pulse causes the transducer to emit stress wave energy into a structure to which the transducer is acoustically coupled. The transducer detects the stress wave propagating in the structure and supplies an electrical signal to the amplifier. The electrical signal is amplified by the amplifier and demodulated by demodulator. A processor measures the peak and area of the demodulated amplified electrical signal and comares them with stored values.

Abstract: A microwave motion-detection system incorporates apparatus for actively supervising the operability of the entire microwave system, from the transceiver component, through the output of its signal processing circuitry. Such supervision apparatus comprises a target simulator which responds to a time-varying electrical signal to cause the transceiver to respond as it does when detecting the type of change in reflected microwave energy normally caused by a target of interest moving in the region under surveillance. Preferably, such target simulator comprises a low-cost, general purpose diode positioned in close proximity to the receiver element of the transceiver, a low-frequency signal generator, and timing and control apparatus for periodically applying the output of the signal generator to such diode. In the event of a failure of any microwave system component during the target simulation operation, the supervision apparatus provides a "trouble" alarm.

Abstract: An ignition timing control apparatus for an internal-combustion engine comprises a resonance-type acceleration sensor for detecting vibration acceleration, a discriminating means for eliminating noise signal components from the output of the acceleration sensor and selecting knocking signal components, a reference ignition timing signal generating means for generating a reference ignition timing signal, a phase shifting means for shifting the phase of the reference ignition timing signal in accordance with the output of the discriminating means, a switching means for interrupting power supply to an ignition coil corresponding to the output of the phase shifting means; and an operating condition detecting means for applying a specific voltage to the acceleration sensor, and for verifying the operating condition of the acceleration sensor and the integrity of a connection between the output side of the acceleration sensor and the input side of the discriminating means from the responsiveness of the acceleration

Abstract: A system for detecting an overheat condition in aircraft preferably includes two control units each connected to eight thermal imaging modules. The thermal imaging modules monitor the cargo by for an overheat condition and if any module detects an overheat condition, the control unit verifies the overheat condition and then triggers an alarm. The control units execute routines to monitor and test their operational status and that of each thermal imaging module. The control units are connected to the aircraft electronics to indicate the location of an overheat condition or any malfunctioning control units and thermal imaging modules. The thermal imaging modules are identical to each other and include an infrared detector, a rotating optical assembly, threshold circuitry and a motor. The optical assembly is rotated by the motor to provide the detector with a conical field of view. The optical assembly focuses the radiation in the cargo bay on the infrared detector.

Abstract: The present invention provides a simulator which when used aboard a vehicle normally undetectable by a traffic signal control system (e.g. A.C. energized buried sensing loop type which detects predetermined changes in the characteristics of an electromagnetic field due to the presence of a detectable vehicle therewithin), will substantially simulate the characteristics of a detectable vehicle within its field and thereby cause any activation of the system. Operationally, the simulator derives an electrical signal from the field (e.g. via a receiving antenna), converts the electrical signal into a modified transmittable signal of an amplitude which when impressed upon the field (e.g. via a transmitting antenna) simulates electromagnetic influence of a detectable vehicle therewithin which is sensed by the detector circuitry and activates an associated traffic signal controller to provide the necessary signals (e.g. a green arrow) to allow safe and unobstructed traffic flow at an intersection.

Abstract: An electronic motor control system is taught herein which utilizes a speedometer testing circuit. The (electronic) speedometer/odometer of a vehicle is tested, with the testing device being interconnected with the (input) terminals of the speedometer, exclusive of whether the speedometer is installed or removed from the vehicle. The testing device is utilized without vehicle input to the speedometer in order to determine whether the speedometer can produce an expected signal upon testing thus determining whether the speedometer is functional or not. The testing circuit has a self-contained power supply, is compact in size, and lightweight, thereby insuring complete mobility of the testing unit and dual application of the circuit to both installed and disengaged speedometer and odometer mechanisms.

Abstract: A squib simulator and dispensing equipment tester has a threshold circuit d simulated load connected to a double-pole magnetically latching relay that switches contacts and turns on a test indicator lamp when the dispensing equipment delivers an input pulse of sufficient amplitude and duration. A power supply provides a logic level through a feedback circuit and the latching relay to the dispensing equipment indicating the status of the squib as either fired or faulted. A reset switch also uses the power supply to reset the latching relay for additional tests.

Abstract: An environmental detection system particularly useful for fire detection and suppression is provided which ensures high reliability in operation and high reliability in preventing false operation. The preferred system includes a microprocessor-based, software-governed, control panel connected to one or more detector loops. Each loop includes a plurality of parallel-coupled, addressable detectors which send analog signals to the control panel representative of an environmental parameter such as smoke obscuration along with reference and identification signals. The preferred system provides automatic calibration and test of the detectors, automatic testing under load of the backup batteries, flexibility in defining the protective scheme, and storage of history information concerning system alarms and troubles. The preferred system also verifies alarm conditions before actuating an alarm or discharging a fire suppressant.