Rock quartz accelerometer servo-circuit

Abstract

The invention discloses a servo circuit of quartz accelerometer, comprising an integrated part and a divided part wherein the integrated part comprises a triangle generator, a differential capacitance detector, an integrating amplifier and a transconductance amplifier; and the divided part comprises a negative feedback circuit, an outer timing capacitor, an outer timing resistance and outer offset resistance. The triangle generator outputs the triangular wave to the differential capacitance detector by an emitter follower. The differential capacitance detector charges and discharges the differential capacitor of the swinging subassembly of the accelerometer the detected differential capacitance signal is converted into the corresponding error current signal and the error current signal is output to the integrating amplifier. After the slowly varying pressure signal is obtained after integrate demodulation by the integrating amplifier, the transconductance amplifier is pushed. The slowly varying pressure signal is added on the electromagnetic torquer of the quartz accelerometer through the transconductance output terminal to form the restoring torque, so as to recover the swing slice at the balance position. The negative feedback circuit is mounted between the inverted input terminal of the integrating amplifier and the output feedback terminal of the transconductance amplifier to form a complete closed loop test system with deep negative feedback.

Description

technical field [0001] The invention relates to a servo circuit of a quartz accelerometer used for measuring the acceleration, velocity and position inclination of a carrier. Background technique [0002] The servo circuit of the quartz accelerometer is a key component of the quartz accelerometer. The quartz accelerometer can be divided into two types: analog and pulse servo. The structure of the analog servo circuit can be divided into several types, but the feedback and torque addition are all analog currents. Pulse servo feedback torque is all pulse current, according to the different ways of feedback torque, it is divided into four types: binary width adjustment, ternary width adjustment, binary intermittent, and ternary intermittent. [0003] An existing analog servo circuit structure such as figure 1 As shown, the quartz accelerometer pendulum component feels the acceleration and produces a deflection, which causes the difference between the two capacitances to chang...

AI Technical Summary

Problems solved by technology

[0004] The existing analog servo circuit of the quartz accelerometer usually adopts a PCB board-level structure composed of discrete devices, and the circuit structure is relatively simple. Its disadvantages are poor capacitance detection accuracy, small output range, poor circuit consistency, poor reliability, and large size.

Restricted by accuracy, range and volume, etc., it is generally used in civilian fields with low requirements, and cannot meet military or industries with special requirements, nor can it meet the requirements of increasing miniaturization

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