Traceable Dynamic Pressure Measurement Based on Macro Definition or Micro Interpretation

Jun Yang, Li Zhang

Abstract

Traceable dynamic pressure measurement is the primary problem faced by dynamic pressure metrology. Various traceable dynamic pressure measurement methods are described and analyzed, which include inertia force, hydrostatic pressure, shock wave theory, laser-piston, refractive index, spectroscopy and so on. Based on the characteristics of various methods and the practices of dynamic pressure calibration researches in CIMM, they are grouped into three categories, which are macro definition of pressure, fluid state equation and fluid physical properties. The latter two are related to the microscopic characteristics of the fluid, and rarely used by static pressure metrology. The advantages and disadvantages of the three categories are compared. The inertial force method is an easy and reliable dynamic pressure measurement method under the existing conditions. The method based on the physical properties measurement, including the laser-refractive index method and spectroscopy method, directly measures the pressure medium's own characteristics and may be able to achieve a wider measurement range and higher dynamic measurement accuracy, which is an important development trend.

Keywords

dynamic pressure, traceable measurement, pressure’s macro definition, thermodynamics, laser measurement

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IMEKO-TC16-2017-007.pdf

DOI

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IMEKO TC

TC16 - Pressure and Vacuum Measurement

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