A large number of dynamic pressure sensors are used to evaluate and test in the development of weapon equipment and engineering application. In order to improve measurement accuracy and data reliability, solving the problem of traceability of amplitude sensitivity of dynamic pressure sensor in high frequency sinusoidal pressure calibration, a method based on laser interferometry to measure the refractive index of liquid medium changing with pressure is applied to calibration device of high frequency liquid sinusoidal pressure. Using piezoelectric stack effect and cavity resonance principle, the sinusoidal pressure signal with frequency up to 30 kHz can be driven by liquid medium. Based on Lorentz-Lorentz theory, a mathematical model of pressure and liquid optical path is established. Laser interferometer is used to measure the change of optical path in liquid, and the magnitude of sinusoidal pressure is obtained, so that the sinusoidal pressure amplitude can be traced back to basic quantity. Combining with the actual calibration process, the influence factors such as uneven pressure distribution, temperature change, structural deformation, vibration and so on are analyzed theoretically and experimentally. Based on the high frequency liquid sinusoidal pressure calibration device of laser interferometry, the uncertainty of amplitude sensitivity calibration of dynamic pressure sensor is evaluated. The results show that the sinusoidal pressure range of calibration device of high frequency liquid sinusoidal pressure by laser interferometry is 0.01 MPa~1 MPa, the static pressure environment can achieve 0~10 MPa, and the expanded uncertainty of amplitude sensitivity calibration is within 7.6% in the frequency range of 1 kHz~30 kHz.
