Honeywell G.m.b.h.

Robert P Pearson

Lloyd W Priddy

Craig A Galbrecht

Single beam signal (SBS) components of the laser intensity monitor (LIM) signal are blanked from the path length control circuit (PLC). The AC component of the LIM signal, less the SBS components, is then integrated to produce a transducer mirror drive signal. SBS component blanking is synchronized to the dither pick-off signal. Peak power operation of the PLC is enhanced through the removal of the SBS components from the LIM signal.

Single beam signal blanking for enhanced path length control in a ring laser gyro

A radar altimeter having a tracking circuit which includes a controllable reference signal generator which is adapted to selectively control the tracking circuit so that there will be no indication of an altitude change in the event of a momentary loss of a received video signal due to the fading of the video signal or other condition requiring the locking of the tracking circuit because of a lack of reliability of the received video signal.

Radar altimeter tracking circuit apparatus

The disclosure describes circuitry for obtaining a compensating voltage signal for a device which is subject to errors caused by changes in a parameter such as ambient temperature. An operational amplifier produces an output voltage at an output thereof indicative of the changes in the parameter. A first and second plurality of series connected resistors are connected between said output and a pair of constant current sources whereby unidirectional electric currents flow through the resistors, junctions being defined between said series connected resistors. Output operational amplifier means are provided, having an inverting input means, a non-inverting input means, and output means at which the compensating voltage is developed. The non-inverting input means is connected to one of the junctions through a series connected resistor and diode, and the inverting input means is connected to another of the junctions through a series connected resistor and diode. Additional resistor/diode elements may be connected between other junctions, and the inverting and/or non-inverting input means to further shape the output compensating voltage.

Apparatus for producing a compensating voltage

Strain gauge transducer apparatus including circuitry for balancing current through a pair of strain sensitive semiconductor resistors is disclosed. A current source supplies constant electric current to a voltage divider and a first strain sensitive resistor which are connected to noninverting and inverting input terminals respectively of an operational amplifier. A second strain sensitive resistor is connected between the output and inverting input terminals of the amplifier to provide a feedback signal which balances the current through the strain sensitive resistors. Temperature compensation may be provided by forming the voltage divider of resistors having temperature coefficients matching those of the strain sensitive resistors, or by means of a temperature sensitive resistor in parallel with voltage divider.

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Saint Paul, MN, United States of America

Robert P Pearson