Dual-purpose cabin for dynamic pressure calibration of optical pressure sensitive coatings

Abstract

The invention relates to a dual-purpose cabin for dynamic pressure calibration of optical pressure sensitive coatings. The dual-purpose dynamic pressure calibration cabin is mainly used for dynamic pressure calibration of pressure sensitive coatings, meets special requirements of the pressure sensitive coatings for a dynamic calibration device, and fills the blank of domestic research in the field. Meanwhile, the calibration cabin is matched with a solenoid valve and a loudspeaker in use, and the effect of dual purposes can be achieved as aperiodic calibration and periodic calibration can be completed. To ensure convenient switching between a pressure phase step mode and a sine mode, a cabin body of the calibration cabin is specially provided with a structure for fixing pressure signal generation sources, namely the solenoid valve and the loudspeaker. A light path is designed on the calibration cabin to meet requirements of pressure testing of the pressure sensitive coatings for ultraviolet light. In addition, damping materials are pasted on the inner wall surface of an experiment section of the calibration cabin to reduce the size of the calibration cabin and avoid the interference of pressure reflected waves on calibration. The dual-purpose cabin is simple in structure, convenient to process and strong in the interference resistance, and can effectively reduce test cost.

Description

technical field [0001] The invention relates to a dynamic pressure calibration device, which is used in conjunction with an electromagnetic valve and a loudspeaker, and can realize both periodic calibration and non-periodic dynamic calibration, and is mainly used for dynamic pressure calibration of pressure-sensitive coatings. Background technique [0002] As one of the three thermal parameters (pressure, temperature, flow) of automatic control, pressure occupies a very important position in measurement and control. There are many ways to measure pressure, but each of them needs to calibrate the measuring equipment in order to obtain measurement data, such as the functional relationship between electrical signals, optical signals, etc. and pressure, and the characteristics of the measurement system such as sensitivity. Calibration can be divided into static calibration and dynamic calibration. Due to the limitations of science and technology and experimental conditions, peop...

AI Technical Summary

Problems solved by technology

[0005] The principle of PSP pressure measurement is based on the principle of photoluminescence and oxygen quenching (that is, under a certain wavelength of ultraviolet light, the photosensitive molecules in the coating obtain energy from the ground state to jump to the excited state, and emit radiant light during the process of returning to the ground state again. After encountering the collision of oxygen molecules and returning to the ground state, no fluorescence will be emitted, and the concentration of oxygen molecules is different at different pressures, so the intensity of radiation light has a certain relationship with the pressure), that is to say, the optical path needs to be designed to give ultraviolet light during the measurement process. By collecting radiation The light signal of light gets the pressure value, so the ordinary dynamic pressure calibration chamber can no longer complete the calibration

For the calibration of PSP, the research on static calibration has been stuck in China. Northwestern Polytechnical University Zhou Qiang et al. 30(12): 2435-2448), etc. have done a lot of work in this area, but there has been no breakthrough in the dynamic pressure calibration of PSP

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