The dynamic calibration method of high-pressure transducer under high-static pressure

The paper describes a dynamic calibration method of high-pressure sensor which is widely used in industrial and military field. The dynamic calibration system was built on a high-pressure hydraulic calibrator with 800MPa range. When calibrating, fitting a high static pressure (such as 400MPa) in the oil cavity first, and then the air gun shoot the bullet and struck Hopkinson bar. The stress wave generated a quasi-δ function signal in the oil cavity, which excited the sensor being calibrated, measured the pulse width of stress wave with strain gauge on the Hopkinson bar, and record the response signal of the sensor. Finally, calculate the frequency response of the sensor. The relation between transient signal width and calibration frequency range was analyzed. This dynamic calibration method is an ideal method for high pressure sensor; it can realize the low limit frequency of the calibrated frequency range strictly reaches to zero frequency.