Development of a primary angular shock calibration system

Abstract

Primary angular shock calibration system is developed by Changcheng Institute of Metrology & Measurement (CIMM). It uses brushless servo motor driving the air bearing system to generate rotational angle, angular velocity and angular acceleration. Both grating and heterodyne laser interferometer with diffraction grating is used to measure the angular movement, which are traceable to the International System of Units (SI). It can be used to calibrate angular transducers, i.e. angular accelerometer, angular velocity transducer, and rotational angle transducer to obtain sensitivity by angular shock or other kinds of excitation. Heterodyne laser interferometer with diffraction grating is successfully used in the measurement of angular acceleration. The method of using grating and scanning heads measure angular acceleration is developed. One characteristic of this system is that it could generate different kind of excitation signals, which include half sine, trapezoidal, sinusoidal, etc. and it can work as a high performance rate table to generate constant angular velocity. The preliminary test shows the uncertainty in calibrating angular accelerometer should be better than 2%. This paper introduces the mechanic system, control system and measurement system of the angular shock calibration system.