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Title: Study On Calibration Technique Of High Impact Acceleration Sensors
Author: Jing Zu, Zusen Lin, Jinbiao Fan, Peng Xu, Xiangnan Shen
Source: 2008 Measurement Science Conference
Year Published: 2008
Abstract: The paper presents a new idea for calibration technique of high impact accelerometers in range of 10000200000g. For tracing calibration of sensors, a Hopkinson bar is excited with a wide impact pulse bigger than 100ys in width produced with a projectile of an air-gun , and the movement of the install base of the sensor calibrated is measured by a laser differential velocity interferometer at the same time. The output signal of the interferometer is used as the source to calibrate the sensitivity of the sensor. The width of exciting pulse must be wide enough, and the highest frequency component is much lower than the natural vibration frequency of the sensor calibrated, to avoid the effect of natural vibration of the sensor. Dynamic calibration of sensors refers to an idea to obtain the frequency response characteristic of the sensor in frequency domain. The process of dynamic calibration of a high impact accelerometer is also used with a Hopkinson bar, but excited with a narrow impact pulse with which the higher frequency component can excite the natural vibration of the sensor calibrated. For sensors with natural vibration frequency greater than 200kHz, an explosion of explosives is used to generate an excite pulse of 23ys in width as the excite source of the sensor. Similarly, the movement of the setting end-plane of the sensor calibrated is measured by a strain gauge on the Hopkinson bar. Then comparing with the frequency characteristics of both the sensor calibrated and the exciting source, the frequency response characteristic of the sensor should be obtained. Based on the things mentioned above, the principle of dynamic calibration of high impact accelerometer and the process of calibration are discussed respectively. The the method of data processing is further analysized. Keywords - High impact, Acceleration sensor, Dynamic calibration, Tracing calibration, Hopkinson bar, Excitation pulse width, Thickness of install base, Diameter of the Hopkinson bar.

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