Broadband miniature laser gyroscope pre-amplification system

Abstract

The invention discloses a broadband miniature laser gyroscope pre-amplification system. The system comprises a photoelectric detector, wherein the photoelectric detector is electrically connected withan I-V switching circuit, the I-V switching circuit is electrically connected with an amplifying circuit, and the amplifying circuit is electrically connected with a comparator circuit; the broadbandminiature laser gyroscope pre-amplification system also comprises a power module, and the photoelectric detector, the I-V switching circuit, the amplifying circuit and the comparator circuit are allelectrically connected with the power module; and the power module is a + / - 5V power supply. The bandwidth of a circuit is increased through frequency band control, increase of feedback resistance andselection of a proper operational amplifier; and circuit noise is reduced, and the signal-to-noise ratio and the switching coefficient of current-voltage switching are favorably increased by increasing the feedback resistance. The whole pre-amplification circuit system adopts shielding design, and the anti-interference capability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of laser gyro amplification equipment, and in particular relates to a large bandwidth and miniaturized laser gyro preamplification system. Background technique [0002] The laser gyro is an optical gyro based on the Sagnac effect, which relies on the resonance frequency difference between the two-way traveling waves in the ring laser cavity to measure the angular velocity of the carrier. As a component of the laser gyro, the detection circuit is mainly responsible for photoelectric conversion, amplification, shaping, counting, etc. of the weak light intensity signal output from the resonator, and outputs a pulse signal proportional to the gyro speed. Laser gyroscopes usually use photodiodes as laser detection devices to perform photoelectric conversion of gyroscope signals. Because the gyro signal is very weak, the signal must first be amplified by an amplifier before shaping, phase identification, and coun...

AI Technical Summary

Problems solved by technology

However, the existing laser gyroscope preamplifier circuit has the following disadvantages. First, the bandwidth is insufficient: the laser gyroscope has a relatively high theoretical bandwidth, but in practical applications, the output signal of the laser gyroscope needs to be photoelectrically converted, preamplified, Reshaping phase discrimination and digital filtering and other processing, these factors limit the bandwidth of the laser gyro to a certain extent; second, the noise is large: the noise mainly includes photodetector noise, resistor thermal noise and operational amplifier noise

And there is no noise processing circuit part in the current circuit design; third, large volume: at present, relatively old integrated circuit chips are generally selected, which are large in size, and the layout of the circuit board is irregular, so the volume of the system is too large; fourth , Poor signal-to-noise ratio: poor signal-to-noise ratio of the output signal will lead to output signal jumps, etc.; fifth, large dark current: there is a dark current in the photodetector itself, and the use of an unbiased circuit can effectively reduce the dark current of the photoelectric tube. Current; Sixth, poor anti-interference ability: the noise of the circuit is large, and the signal-to-noise ratio is poor, so the anti-interference ability of the system will be relatively poor

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