Researches on small amplitude dynamic pressure measurement method by laser interferometer based on refractive index

Abstract

Traceable measurement problems have always been difficult in dynamic pressure calibration. The dynamic pressure measurement method by laser interferometer based on refractive index is studied for micro sinusoidal pressure calibration. The linear relationship between the pressure and the refractive index is verified by the refractive index model of water and air and the static pressure experiments. Based on the in-situ calibration method and the optical multiplier the measurement method is preliminary applied on the micro sinusoidal pressure calibration device with air. The main influencing factors such as the temperature’s change and the glass window’s movement were quantified, the advantages and disadvantages of water and air used as the pressure medium were compared, and the follow-up research direction is further clarified.