Abstract: Linear acceleration responsive apparatus is disclosed wherein a sensing mass is suspended within a housing by torsion hinge means located along a pair of parallel axes in each of two planes perpendicular to an input axis. Separate torsion hinge means in each plane are attached to the mass and the housing by ring assemblies, and are joined by intermediate arms which may serve as flex leads for carrying electric current to a force rebalance winding on the mass.

Abstract: A battery holder for a control device is integral with the base of the control device and has a first support member with battery connections and a second support member which is made up of a L-shaped lever comprising a portion of the base. The second support member is flexible whereby the battery can be placed between the first and second support members and a force moving the battery toward the connection means by the second support member will connect the battery to the connection. The battery can be removed from the battery holder by lifting the second support member. Adjacent support members which are hooked to hold the battery in place are flexible to move away from the battery when the battery is lifted to be in a position so that the battery can then be manually pulled out of the battery holder and disconnected from the battery connection means.

Abstract: A temperature compensated accelerometer of the type having a permanent magnet, moving coil rebalance system is disclosed. A cylindrical permanent magnet and surrounding sleeve produce radial magnetic fields in annular regions in which are located rebalance coils on a suspended bobbin. A noninductive temperature sensing winding on the magnet is connected in a bridge input circuit to an amplifier which produces a current in an auxillary winding for augmenting the fields produced by the permanent magnet so as to maintain constant magnetic field strength in the annular regions.

Abstract: A circuit is provided for detecting a low battery voltage for use with applications where it is desirable to keep the drain on the battery at a very low value and to do so at a minimum cost.

Abstract: A double-sided mosaic focal plane for infrared detection includes a semiconductor substrate having first and second opposing surfaces. Infrared detectors are mounted on the first surface and solid state signal processing circuitry is formed in the semiconductor substrate proximate the second surface. Interconnect means extend through the semiconductor substrate to interconnect the infrared detectors with the solid state signal processing circuitry.

Abstract: Probe apparatus is disclosed for in place testing of circuit boards of the type which carry electrical components interconnected at nodes accessible from at least a first side of the board. The probe apparatus may comprise a card which is attached to the circuit board under test adjacent its first side. A probe module, including signal conditioning means and a short interfacing element, is mounted on the card in close proximity to the node of interest. The signal conditioning means and interfacing element may comprise electrical decoupling and signal pick off means capable of sensing signals at the node while minimizing introduction of spurious signals thereto.

Abstract: An optical limiter includes two bandpass filters whose narrow passbands are at least partially overlapping at low light levels. One of the two filters is well heat-sunk while the other is not. When the input light level exceeds a threshold level, heating causes the passband of the thermally isolated filter to shift relative to the passband of the heat-sunk filter. High level light self-limits or attenuates itself by virtue of the filter passband mismatch that occurs.

Abstract: An improved low-cost solar air heater is disclosed which utilizes an array of holes or jets in an intermediate solar window to produce impingement of the air on the upper or solar energy absorbing surface of the absorber plate to enhance heat transfer efficiency and reduce convection losses from the system.

Abstract: A low-cost solar air heater is disclosed which utilizes an array of jets to produce impingement of the air on the lower surface of the absorber plate which enhances heat transfer efficiency.

Abstract: An automatic continuous focus system of the spatial image correlation type determines whether focus correction is needed and in what direction and moves a lens in accordance with these determinations.

Abstract: An automatic focus system of the spatial image correlation type uses a dual scan technique. During a first scan, the amplitude of the major extremum in the correlation signal is stored. During the second scan, this stored amplitude is used to pick out the point of best focus.

Abstract: A load shedding control device, for reducing the electrical energy demand of an electrical load apparatus having a load dependent upon ambient temperature, having an ambient temperature responsive switch adapted to be connected in a control system of the electrical load apparatus for reducing the use of electrical energy by the electrical load apparatus as the ambient temperature increases. The ambient temperature responsive switch has its control temperature reset depending upon the percent of operating time of the electrical load apparatus whereby as the desired operating time of the load apparatus increases, the actual operating time is reduced to conserve electrical energy.

Abstract: A load shedding control device, for reducing the electrical energy demand of an electrical load apparatus having a load depending upon ambient temperature, having an ambient temperature responsive switch adapted to be connected in a control system of the electrical load apparatus for reducing the use of electrical energy by the electrical load apparatus as the ambient temperature increases. The ambient temperature responsive switch has its control temperature reset by an artificial heater energized proportionally to the percent of operating time of electrical load apparatus, whereby as the desired operating time of the load apparatus increases, the actual operating time is reduced to conserve electrical energy.

Abstract: A block oriented random access memory (BORAM) utilizes a shift register to sequentially address each word of a selected memory block.

Abstract: An ultrasonic air movement vector and magnitude sensing apparatus using a three element ultrasonic probe and temperature sensor in combination with an electronic computational circuit to produce air movement signals indicative of magnitude and direction in at least three cardinal axes.