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Gas pressure measuring method

A gas pressure and measurement method technology, applied in the field of aerodynamics, can solve the problems of complex manufacturing process of pressure measurement paint and high cost of pressure fluorescent probes, and achieve the effect of low price, low cost and accurate results

Active Publication Date: 2018-11-30
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, in view of the disadvantages of traditional pressure fluorescent probes in the existing PSP technology, such as high cost, a certain oxygen exchange time, and complicated manufacturing process of pressure measuring coatings, it is necessary to provide a low-cost measurement, short response time, and richer and more diverse coating processes. pressure measuring coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Apply a gas pressure of 1 MPa to the outer surface of the object to be measured, and monitor the change of afterglow intensity at different stages of afterglow decay. From the results, it can be found that there is a regularity in the change of afterglow intensity at different stages. In the interval of decay time of 150-250 seconds, the pressure response of the afterglow material is the most sensitive. The results are as follows image 3 as shown, image 3 It is the response result of decaying to different time to the same pressure (1Mpa) measured in Example 1 of the present invention.

Embodiment 2

[0059] In the afterglow interval where the afterglow intensity decays to 5% to 30% of the initial brightness, the same external gas pressure acts on the surface of the afterglow material, and the linear correlation curve between the change of the afterglow intensity and the degree of attenuation is as follows: Figure 4 as shown, Figure 4 It is the result curve of brightness change attenuated to the initial afterglow brightness between 28% and 8%.

Embodiment 3

[0061] After the afterglow lasts for 240 seconds, when the gas pressure of 20000, 40000, 60000, 80000, 100500, 110000, 130000, 150000, 190000, 230000, 280000Pa is applied to the surface of the afterglow material, the brightness change of the afterglow material is linearly related to the pressure. Thus, through the measurement of the afterglow brightness change, the standard curve for measuring the gas pressure is obtained, and the results are as follows Figure 5 as shown, Figure 5 The standard curve of the measured gas pressure and the pressure-afterglow intensity results obtained in Example 3 of the present invention. Among them, (a) 20000, 40000, 60000, 80000 (b) 100500, 110000, 130000, 150000 (c) 190000, 230000, 280000 (d) the fitting curve of pressure versus afterglow intensity change.

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Abstract

The invention provides a gas pressure measuring method. The gas pressure measuring method comprises the steps that a long afterglow material is placed on the surface of a to-be-measured object, and the long afterglow material on the surface of the to-be-measured object is excited by an excitation light source; known gas pressure is applied to the excited surface of the to-be-measured object, and astandard working curve of the pressure of the surface of the to-be-measured object is obtained through response of the afterglow strength change of the long afterglow material to the known gas pressure; and unknown gas pressure is applied to the to-be-measured object to obtain the afterglow strength change, and the gas pressure on the surface of the to-be-measured object is obtained by comparingthe correlation between the afterglow strength change and the gas pressure with the standard working curve. The organic long afterglow material is adopted to replace a metal organic complex fluorescent probe in traditional pressure sensitive paint, the cost is low, and stability is good. Trap distribution of the afterglow material is changed through change of the pressure of the surface of the to-be-measured object, thus the luminous brightness of the afterglow material is changed, measuring is easy, and the result is accurate; and meanwhile the pressure response time of the afterglow materialis short.

Description

technical field [0001] The invention relates to the technical field of aerodynamics, in particular to a method for measuring gas pressure. Background technique [0002] In many cases in the field of measurement and control, it is necessary to measure the instantaneous pressure on the surface of the measured object. At present, there are two common solutions. The first is a more traditional pressure measurement method. By manufacturing an expensive special pressure measurement model, And a series of dedicated pressure measuring holes are opened on the surface of the model to measure the intermittent point pressure. The other is to apply pressure sensitive paint (PSP: pressure sensitive paint) on the surface of the model to be tested. The method of optical measurement measures the surface pressure distribution of the measured area. This method can obtain continuous, large-scale pressure data. It is especially worth mentioning that it plays an irreplaceable role in the measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L11/02C09K11/64
Inventor 李成宇李达庞然张粟姜丽宏刘贯宇
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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