Improved Quasi- Function Pulse Pressure Dynamic Calibration of High-Pressure Transducer
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摘要: 针对现有准函数脉冲压力校准法存在的缺点,提出了一种预先给压力传感器施加高静压,再利用子弹撞击霍普金森杆产生幅值较小的准信号激励传感器,获得压力传感器频响特性的动态校准方法。阐述了准函数脉冲压力校准原理,分析了准信号的脉宽与频率校准范围、校准精度三者之间的关系,建立了动态校准系统该校准方法实现了在实际工作压力下校准压力传感器,可校准的下限频率严格地达到零频。就目前的校准技术而言,对传感器施加的最大静压是800 MPa,产生的准信号的脉宽为7~10 s,可校准的频率范围为0~20 kHz,幅频特性校准误差为5%。Abstract: Based on the analysis of shortcomings existed in quasi- function calibration method, a dynamic calibration method was proposed. In this method, a pressure sensor was under high static pressure in advance, and then a bullet was used to impact Hopkinson bar for generating a quasi- function signal with small amplitude, which excited the sensor being calibrated, and finally a frequency response characteristics of the sensor was obtained. The principle of quasi- function dynamic calibration method was introduced. The relation of pulse width of quasi- function signal, calibrated frequency range, and calibration precision was analyzed. The dynamic calibration system was established. This calibration method realized dynamic calibration of high pressure sensor under actual working pressure, and realized the tracing from zero frequency to a certain frequency needed. On the current technical level, the maximum static pressure is 800 MPa, the pulse width of the quasi- function signal is within 7 s to 10 s, the calibrated frequency range is from 0 to 20 kHz, and calibration error of amplitude-frequency characteristics is 5%.
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Key words:
- high-pressure transducer /
- dynamic calibration /
- frequency response /
- quasi- function
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