Abstract: A HgCdTe S-I-S (semiconductor-insulator-semiconductor) two color infrared detector wherein the semiconductor regions are group II-VI, preferably HgCdTe, with different compositions for the desired spectral regions. The device is operated as a simple integrating MIS device with respect to one semiconductor. The structure can be grown by current MBE techniques and does not require any significant additional steps with regard to fabrication.

Abstract: A flow regulating valve for air conditioning systems is shown in which a body member (26, 26a-26e) is provided with a passageway (28, 28a-28f) which results in regulating flow of refrigerant into the evaporator of the air conditioning system under normal conditions. Under severe operating conditions, e.g., high ambient temperature and low or idle speeds, the system refrigerant pressure rises. This increases pressure in the evaporator and an increase in the saturation temperature of refrigerant in the evaporator. This increase in temperature is sensed by a thermostatic metal element (44, 80, 88) of the regulating valve which moves to increase restriction to the flow of the refrigerant fluid through the valve thereby decreasing pressure of the refrigerant entering the evaporator.

Abstract: A protective, impact resistant material and method, the material comprising a fabric of thermoplastic polymeric fibers having a strength of at least 0.5 GPa and an elastic modulus of at least 25 GPa and a matrix of polymeric material disposed in the interstices between the fibers, the matrix having an elastic modulus in the range 0.2 to 3.times.10.sup.6 psi. The polymeric fibers can be gel spun polyethylene, polypropylene, nylon, polyvinyl alcohol and polyethylene terephthalate. In a second embodiment, the matrix is derived from the fabric.

Abstract: An electric control for gas furnaces which controls a two speed main blower fan and an induction draft fan based on inputs from a room thermostat, a high limit and an ignition control including a gas valve. The control has a circuit board having a power supply for providing 24 volts DC current source to drive DC relays and a 5 volt DC power source to power a microprocessor. 24 volt AC input signals are coupled to the input ports of the microprocessor through current limiting resistors and to AC ground through pull down resistors. AC ground is also connected to the IRQ port of the microprocessor. The output ports of the microprocessor are connected to a relay driver which in turn is connected to the relays. Several breakaway tabs in the board provide optional features such as eliminating a normally provided draft delay timing function. Test pads are provided on the board so that the board can be tested during manufacture.

Abstract: A phase sequence protection circuit is shown in which first and second resistors (R1, R2) and a first capacitor (C1) all having equivalent impedance are connected in a Y configuration and coupled to power source leads (A, C, B) of a three phase power supply, resistor R1 being coupled to phase A, capacitor C1 to phase B and resistor R2 to phase C. A comparator network (12) is connected in line with the first resistor (R1) and, in one embodiment will cause a solid state switch (Q1) to conduct when the phases are out of sequence. In a second embodiment a buffer portion (COMP2) is provided to add switching hysteresis which also reverses the switching logic causing the solid state switch (Q1) to conduct when the phases are in sequence. In another embodiment the comparator network (12") is provided with the buffer portion (COMP2) for switching hysteresis and arranged to cause the solid state switch (Q1) to conduct when the phases are out of sequence.

Abstract: The parameters of a digital signal are extracted by the application of autocorrelation and crosscorrelation techniques to effectively measure the frequency and time behavior of a digital signal. The method employs digital autocorrelation and crosscorrelation to determine these parameters. Autocorrelation allows the measurement of signal frequency by measurement of instantaneous signal phase. Crosscorrelation allows measurement of relative phase between two or more signals in two or more channels by measurement of instantaneous phase and by referencing the instantaneous phase to the autocorrelation function. The autocorrelation function and crosscorrelation function preserve relative amplitude and phase. Measurement of relative amplitude and phase allows direction finding calculation for any current class of system that uses amplitude and/or phase to derive angle or arrival.

Abstract: A socket (100) for the temporary mounting of an electric part such as an IC package (130) for burn-in testing and the like is shown in which a plurality of contact elements (10, 10') are mounted in the socket each having a stationary part (10a), a spring cantilever arm part (10b) and a contact edge part (10e). The contact elements (10, 10') are mounted so that the leads (130a) of an IC package (130) are each received on a respective contact edge part (10e). When the cover (102) of the socket is closed, wall member (105a) engages the top portion of the leads (130a) and exerts a generally vertical downward force on the contact edges (10e) causing them to be depressed to effect electrical connection between leads (130a) and respective contact elements (10, 10').

Abstract: A failsafe device is shown in which a solid state surge suppressor (12) is mounted thermally coupled to a heat transfer element (42). A shorting bar (60) is attached to element (42) by a thin layer of solder chosen to melt at a selected maximum temperature. A spring (70) places a preload on the shorting bar and, upon melting the solder, rapidly moves the shorting bar into engagement with leads (T, G, R) attached to the surge suppressor to short the T and R leads to ground (G).

Abstract: An acceleration sensor is shown having a substrate (16, 16', 16", 16'") on which a capacitor detect plate (24) and source plate mounting portion (28c) are disposed. An electrically conductive blade member (40, 44) having an attachment portion (40a, 44h), a source plate portion (40i, 44a) and integrally attached beams (40b, 40c; 44b) extending along opposite sides of the blade member is mounted on the substrate by welding the attachment portion to a mounting element (36, 36', 36", 36'") which is closely received in a bore (32, 32', 32", 32'") formed through the substrate at the source plate mounting portion. The mounting element or the bore is formed with a surface suitable for forming an interference fit and for making electrical engagement with a conductive layer received in the bore. The mounting element has one end (36b, 36b', 36b") which extends above the top surface (26, 26") an adjustable selected amount(s) to provide desired spacing between the source plate portion and the detect plate.

Abstract: A electronic motor protection system is shown having a power supply (12) usable with multivoltage supplies and providing protection from over-temperature conditions caused by various fault conditions. The system also has optional features of a time delay (20) for re-energization and for low voltage protection (22). The system is mounted on a circuit board and encased in potting material which also locks two housing parts together (30, 34). A miswiring feature is also provided to prevent connecting line voltage to the control circuit or sensor terminals.

Abstract: A monolithic capacitive pressure transducer (12, 12') is made by separately forming under pressure a diaphragm (22, 22') and a base (24, 24') having a recess (26) in the top surface using ceramic powder coated with an organic binder. Metal layers are deposited on the two pieces and the pieces are then joined together to form a single unit. A spacer (36) may be inserted in the recess to ensure that a predetermined gap is maintained between the two parts during the joining operation. The parts are then heated to allow the binder organics, as well as the spacer organics if a spacer is employed, to be vaporized and/or decomposed and removed through the open pores of the diaphragm and base and then sintered to change the parts into a monolithic body and to convert the metallized layer into a conductive layer bonded to the ceramic.

Abstract: An acceleration sensor (10, 10', 10") in which a metal blade member (24) having a source plate portion (24a), attachment portion (24p) and integral resilient beams (24b) extending between the source plate portion and the attachment portion is attached to a pin (22) received in turn in a bore (18a) of a substrate (18). The metal blade member (24) is mounted on the substrate (18) so that the source plate portion is a selected distance from a detect plate (18b) mounted on the substrate. The sensor is disposed in a cylindrical housing (12, 12', 12") which can be directly mounted to a circuit board (50) through terminal pins (18g, 18h, 18i) or can be provided with a threaded fastener (12"d). In one embodiment first and second sensor modules are received in a housing (42) to sense acceleration forces in two perpendicular directions.

Abstract: Durable thorium fluoride, low reflectance, high transmittance coatings for germanium (zinc sulfide, zinc selenide, gallium arsenide) exterior window surfaces are replaced using magnesium fluoride, a material previously not considered applicable to the 8 to 12 .mu.m wavelength range. This is enabled by the use of argon ion bombardment of the growing film. This method reduces the intrinsic stress of deposited films and permits growth of magnesium fluoride films of sufficient thickness to be used on the exterior surface of IR windows.

Abstract: A high voltage, high current DC switch is shown having a single pole, double throw relay and a solid state power switch such as an IGBT or MOSFET transistor. Voltage is switched by means of the solid state switch while steady state current is conducted through the relay load contact. Several different protector devices are used in the event of circuit malfunction including a combination of thermal and current fuses and resettable thermostats.

Abstract: A method of making a diode and the diode wherein there is provided a substrate of p-type group II-VI semiconductor material and an electrically conductive material capable of forming an ohmic contact with the substrate is forced into the lattice of the substrate to create an n-type region in the substrate in contact with the material and forming an electrical contact to the p-type region of said substrate. The substrate is preferably HgCdTe and the electrically conductive material is preferably tungsten or tin coated tungsten or tungsten coated with a mercury amalgam.

Abstract: There is disclosed a multi channel GPS digital signal processor on a single IC. Each channel contains circuitry to process L1 or L2 P(Y) and C/A-code signals. In addition a search processor is included to achieve fast signal acquisition. Low power adder/accumulators have been designed to provide for a high precision digital oscillator whose output is synchronous to a high speed clock. The IC contains a full low power null detector and eight correlators to aid in signal acquisition.

Abstract: A protectively coated optical device which includes an infrared transmissive optical surface and an infrared transmissive polymer coating on the surface having low hardness, high strength and low elastic (Young's) modulus and is transmissive in the 8 to 12 micrometer wavelength range. The hardness is less than 50 kg/mm.sup.2, the strength is from about 10,000 to about 100,000 psi and the elastic (Young's) modulus is from about 0.2.times.10.sup.6 to about 3.times.10.sup.6 psi.

Abstract: An electronic control for gas furnaces controls a two speed main blower fan and an induction draft fan based on 24 volt input signals from a room thermostat, a high limit and an ignition control including a gas valve. The input signals are coupled to input ports of a microprocessor through current limiting resistors and to AC ground through pull down resistors. AC ground is also connected to the IRQ port of the microprocessor. Output ports of the microprocessor are connected to a relay driver which in turn is connected to relays for energizing and de-energizing the fans. The control calibrates itself on a continuing periodic basis to read the AC inputs synchronously at the peak of their wave and can switch the relays asynchronously based on the Real Time Clock of the microprocessor or can be switched synchronously by providing a selected delay so that contact engagement and disengagement occurs at or near the zero crossing of the AC line voltage wave form.

Abstract: A gas fired furnace system (10) has a controller (14) controlling the supply of gas through a gas valve (12) and air for combustion by means of an induced air draft fan (28), ignition of the gas by means of ignitor (22), the delivery of heated air from a heat exchanger (20) by means of an air blower (34) in response to signals from a thermostat (42). A selected constant flow of air for combustion is provided by controlling the speed of the motor driving the induced motor fan (28) despite changes which may occur in back pressure. Induced draft fan motor parameters proportional to motor torque and motor speed are read on an ongoing basis and inputted to controller (14) which computes a desired voltage and compares that with referenced data stored in the controller memory and makes corrections to the speed of the induced draft fan motor to maintain the constant air flow.

Abstract: A digital television system (10) is provided. System (10) may receive a video signal at composite video interface and separation circuit (16). The video signal is separated into separate video signals by composite video interface and separation circuit (16). The separate video signals are converted to digital video signals in analog to digital converter circuit (18). Line slicer (14) divides each line of digital video signal into a plurality of channels such that each channel may be processed in parallel by channel signal processors (22a) through (22d). Each channel signal processor (22a) through (22d) may provide two lines of output for each line of video input. The processed digital video signals may be formatted for displays (26a) through (26c) in formatters (24a) through (24c).