A method for measuring object deformation in high temperature environment

Abstract

The invention discloses an object deformation measurement method in a high-temperature environment. Firstly, image acquisition on the condition of different optical attenuation rates is performed on an object with relatively large surface area brightness difference. Furthermore based on the image acquisition, an image series synthesis method on the condition of different optical attenuation rates is presented. Furthermore deformation information is acquired based on a synthesized image. The object deformation measurement method has advantages of eliminating an influence of overlarge object surface brightness difference in the high-temperature environment, realizing deformation measurement on the object with relatively large surface temperature gradient in the high-temperature environment, and settling a defect of incapability of performing deformation measurement on the object with relatively large surface brightness difference. The object deformation measurement method supplies an important reference basis for testing an engine, a nose cone and a leading edge of an existing high-supersonic-speed aircraft.

Description

technical field [0001] The invention relates to a high-temperature deformation measurement method based on light attenuation and image processing technology, and belongs to the technical fields of material science and optical experiment. Background technique [0002] When a hypersonic vehicle is in service, its engine blades, nose cone, and leading edge are often exposed to extremely high temperatures. Ground high-temperature tests must be conducted on these hot-end components before official service. Among them, the measurement of the deformation of the hot-end parts in a high-temperature environment has important guiding significance for evaluating its thermodynamic performance indicators. Take the high-temperature wind tunnel assessment, which is currently the main method for assessing the hot-end structure and components of aircraft, as an example. In this assessment method, the temperature at the front end of the test piece facing the high-temperature and high-speed air...

AI Technical Summary

Problems solved by technology

Therefore, the deformation area of ​​high temperature measurement often cannot take into account

At present, although there are reports that use narrow-band filtering plus corresponding monochromatic light compensation to suppress the influence of high-temperature radiation, clear images still cannot be obtained in the case of large temperature differences.

Moreover, the price of high-precision narrow-band filters is relatively high, which is not suitable for large-scale promotion and use.

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