METHOD OF MEASURING DYNAMIC PRESSURE

Abstract

Modern production processes, scientific research, testing complexes in high-tech industries, etc. require increasingly sophisticated measurement technologies. The cornerstones of these technologies are sensors of various physical quantities, in particular sensors of liquid or gas pressure.

A distinctive feature of pressure measurement in many technical systems is its dynamic, rapidly changing nature. Since sensors are often elements of a control system, such pressure measurements must be performed in real time.

The method of dynamic pressure measurement presented in the paper is based on the obtained solution of the inverse measurement problem. It is shown that the presence of high-frequency components in the output signal is the reason for the incorrectness of the inverse measurement problem.  To eliminate high-frequency components, it is suggested to use wavelet filtering and window averaging of the sensor output signal. The theoretical approbation of the developed method of measuring dynamic pressure on models of input signals is demonstrated. The developed method works in real time with an error within the static error of the sensor. In addition, the work shows that a priori information about possible destabilizing factors is quite important in real measurements. First of all, this refers to information that can be used to assess the degree of influence of destabilizing factors by the noise/signal parameter. In this case, for this or that sensor, it is possible to outline such an area of application where, using the method of direct differentiation of the output signal, it is possible to measure the dynamic pressure in real time with a given accuracy. In addition, based on the value of the permissible measurement error, you can choose a pressure sensor that will ensure the required measurement accuracy.