WIDE-RANGE FIBER-OPTICAL METER OF ANGULAR VELOCITY Russian patent published in 2004 - IPC

FIELD: gyroscopic and instrumentation equipment. SUBSTANCE: wide-range fiber-optical meter of angular velocity incorporates optical circuit, device converting and extracting signal that forms train of pulses of specified duration and frequency proportional to speed from output of meter corresponding to sign of speed. Optical circuit of meter includes radiation source, depolarizer, input splitter, optical integrated circuit in the form of waveguide polarized and Y-shaped waveguide distributor with wide-band phase modulators on output arms, measurement fiber circuit and two photodetector modules connected in series by welding. To decrease random drift radiation source comes in the form of wide-range superlumeniscent diode, which is enveloped by two feedbacks. First feedback optically couples second output of radiation source to its input through photodiode of second photodetector module stabilizing by that radiation power by way of smooth change of pumping current of radiation source. Apart from this photodiode of second photodetector module is built into radiation source. Second feedback connects temperature-sensitive element (thermistor) to microcooler based on Peltier effect through amplifier controlling temperature which is bridge amplifier and power amplifier connected in series to stabilize temperature of radiation source by change of direction of current through microcooler. Microcooler and thermistor placed in feedback of bridge amplifier are built into radiation source. Device converting and extracting signal includes multichannel former of synchronization pulses, amplifier-converter of rectangular voltage, two phase-sensitive rectifiers, converter of rectangular voltage of auxiliary modulation, converter of saw-tooth voltage of compensation modulation, pulse converter whose main output is output of meter and source of secondary power supply. EFFECT: provision for stability and linearity of scale coefficient of wide-range fiber-optical meter of angular velocity in wide range of speeds, enhanced sensitivity and noise immunity, reduced random drift and weight of pulse without any effect on mass and size characteristics. 6 cl, 15 dwg