Quartz flexible accelerometer has been widely used in all kinds of modern inertial systems. Guidance systems such as missiles, airplanes, warships, combat vehicles, underwater missiles and other guidance systems must have speed and position information. In low demand situations, people use air speedometer, Mach number sensor, odometer, etc.           
Application fields: Aerospace high-precision navigation system, inertial navigation, navigation positioning, flight attitude control or geological exploration strapdown system.            Working principle of quartz flexible acceleration sensor:        
It is composed of yoke iron, which is made of soft magnetic material with low temperature coefficient and good magnetic conductivity. The magnetic steel is made of permanent magnetic material with good magnetic conductivity and processed by grinding machine.           
The material of flexible sheet is quartz glass with excellent temperature performance, and its shape is made by ultrasonic processing. The processing of flexible element generally adopts chemical etching method, or reactive ion etching process, but the cost is very high.           
The differential capacitance change caused by acceleration is detected by the differential capacitance detector in the servo circuit. The output is current, which is converted into output voltage by current integrator, and then the voltage is converted into output current by transconductance compensation amplifier. The output current is proportional to the input acceleration.           
Quartz flexible acceleration sensor is a single axis torque feedback accelerometer. It detects the external acceleration signal by detecting the quality, demodulates and amplifies the servo circuit, and finally outputs the current signal proportional to the acceleration signal.           
Quartz flexible acceleration sensor has high precision, good repeatability, high reliability, small volume, light weight and low power consumption.           
With the improvement of the performance requirements of weapon system, the linear accelerometer can be installed in the moving object to directly measure its acceleration, and then get the velocity and position. Its measurement accuracy is high and the dynamic performance is good, which is much better than air velocity meter and odometer.