Design of quartz accelerometer signal acquisition system

This paper presents a new quartz accelerometer signal acquisition system in order to collect quartz accelerometers´ current signal. In the system, we could transform current signal to voltage signal through precision sampling resistor. Then the analog voltage signal will be converted into digital signal by the high precision A/D chip AD 7732. In the case of small current, the system would also get the large voltage signal in the method of switching high-value resistors. This method makes full use of the A/D chip measurement range and enhances the precision of the system properly. The experimental results proved that the method of switching channel can improve the precision signal acquisition. This method enhances the precision of the accelerometer signal acquisition system to ±1×10^-5 g when the current is small, which can satisfy the requirement of Inertial Navigation System.