Research On Liquid Floated Pendulous Accelerometer Testing System

Accelerometer is the main inertia measurement device of inertia measure- ment and navigation system, it's mainly used to measure the acceleration of carrier, and we can get the velocity and displacement of carrier from acceleration, so it's wildly used in spaceflight, avigation, navigation and other fields, the capabilities of accelerometer are of the key function in the whole system. In order to guarantee the stabilization of system, many parameters of the acceler- ometer's capabilities have to be tested in a stable environment, and make sure the capabilities of accelerometer are eligible. Along with the development of the fields, the requirement of accelerometer is more and more big and the request of accelerometer's capabilities is more and more high, so in order to improve the precision and efficiency, the research of accelerometer testing system is of great significance.This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering. At first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu-lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band-pass filter, alternating amplifier, phase sensitive demodulatorn, pulse-width modulation, frequency scale circuit, moment current generator. Finally, using the graphics program language LabV-IEW which is designed for testing field especially by NI accomplishes the solfware design of testing system,realized the testing functions.