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Temperature effect-based fluorescent oil film thickness calibration method

A calibration method and temperature effect technology, which is applied in the direction of optical devices, machine/structural component testing, measuring devices, etc., can solve the problems of calibration oil film thickness, temperature, error, etc., and achieve high accuracy, good stability, and ease of use. Measured and Calculated Effects

Active Publication Date: 2018-06-29
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0005] The technical problem solved by the invention is: Aiming at the problem that the surface temperature measurement of the model in the prior art tends to have large errors, and it is difficult to calibrate the thickness and temperature of the corresponding oil film through the ground, a method for calibrating the thickness of the fluorescent oil film based on the temperature effect is proposed. Can perform calibration between the thickness of the fluorescent oil film and the gray value of the collected image under the condition of temperature change

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  • Temperature effect-based fluorescent oil film thickness calibration method
  • Temperature effect-based fluorescent oil film thickness calibration method
  • Temperature effect-based fluorescent oil film thickness calibration method

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Embodiment Construction

[0037] The present invention will be further described step by step in conjunction with the accompanying drawings.

[0038] A method for calibrating the thickness of fluorescent oil film considering the temperature effect proposed by the present invention requires the following preconditions: first, the oil film to be calibrated must contain two fluorescent substances of different components, and the two fluorescent substances of different components must have the same The excitation light band is generally the ultraviolet light band, with a center wavelength of 365nm-400nm; two fluorescent substances with different components have different stimulated emission light bands. In order to distinguish clearly and facilitate color camera detection, the green light band (495nm- 570nm) and red light band (620nm-750nm), the base oil used is dimethyl silicone oil; secondly, when carrying out ground calibration and wind tunnel tests, the ultraviolet light source (365nm) is generally used...

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Abstract

The invention provides a temperature effect-based fluorescent oil film thickness calibration method, which comprises the following steps: calibrating an oil film in the selected test environment temperature and acquiring oil film parameters, acquiring a linear function relation formula of a gray value and a height value of the oil film, further acquiring the linear function relation formula of a linear image intercept and an oil film temperature value, so as to finally achieve the purpose of calculating the oil film height value and oil film temperature value in a wind tunnel test according tothe currently acquired image gray value. According to the calibration method, the parameter calculation is simple, the measurement stability is good, the effect from surface heat flow does not exist,and the measurement precision is high.

Description

technical field [0001] The invention relates to a method for calibrating the thickness of fluorescent oil film based on temperature effect, and belongs to the technical field of aerospace test oil film. Background technique [0002] The measurement of aircraft surface frictional resistance is a very important content in wind tunnel experiments. The distribution of surface frictional resistance can be used to describe the characteristics and topological structure of the surface flow of objects in the flow field, and provide a way for understanding and understanding the interaction between objects and flow fields. beneficial way. Surface frictional resistance is closely related to the resistance and aerodynamic heat generated during the movement of the aircraft. Its measurement can help engineers optimize the design of the aircraft and improve the performance of the aircraft. Especially under hypersonic conditions, the surface frictional stress is flowing There are large diff...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06G01B11/06
CPCG01B11/0625G01M9/067
Inventor 王宏伟魏连风李晓辉黄湛
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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