Test device and test method for thermal sensitivity drift of impact accelerometer

Abstract

The invention relates to a test device for testing the change of the sensitivity output of an impact accelerometer with temperature. The test device comprises a temperature control box, a metal rod, apneumatic system, an accelerometer signal amplifier, a laser interferometric speed measuring device, and a computer for data sampling and data processing; the metal rod is horizontally supported by asupporting structure and can move freely axially; one end of the metal rod is aligned with the pneumatic system; the other end of the metal rod fixes an accelerometer to be tested and is arranged inthe temperature control box; the output signals of the accelerometer are inputted to the signal amplifier through a wire; the laser interferometric speed measuring device emits laser onto the metal rod and receives reflected laser; the output signals of the accelerometer signal amplifier and the laser speed measuring device are connected with the computer through data wires; and a relationship between the sensitivity output of the accelerometer to be tested and temperature is obtained by means of an absolute method. The test device of the invention has the advantages of large impact acceleration, directness and relatively high accuracy.

Description

technical field [0001] The invention relates to the technical field of mechanical testing and analysis of microsensors, in particular to a testing device and method for thermal sensitivity drift of an impact accelerometer. Background technique [0002] High-range accelerometers, that is, accelerometers that can withstand high shocks (ie, shock-type accelerometers) are now in widespread use. The thermal sensitivity drift of an accelerometer is an important parameter that needs to be measured and characterized. The sensitivity of the accelerometer generally changes with temperature, which is represented by thermal sensitivity drift, which refers to the relationship between the sensitivity of the accelerometer and the temperature. [0003] Accelerometers are generally divided into small range and large range, and their test methods are also significantly different. Generally speaking, for a small-range accelerometer, a vibration table can be used to conduct a sensitivity temp...

AI Technical Summary

Problems solved by technology

Because the accelerometer is fixed in the temperature control box, it is difficult to perform laser alignment through the observation glass window of the temperature control box

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