Method for measuring deformation of object in smoke under flame smoke environment

Abstract

The invention provides a method for measuring deformation of an object in smoke under a flame smoke environment, and belongs to the technical field of structural deformation measuring and optical measuring mechanics measurement. The method comprises the steps of irradiating the surface through a laser source or a narrow-band light source to separate a measured object surface with high temperature reflector speckle pots; shooting the surface of the object to be measured through a CCD camera with a filter film on a lens by passing through the flame smoke to obtain a fuzzy image of the speckle pots on the object surface; recovering the clear original image of the speckle pots on the surface of the measured object without being fuzzed by the flame smoke by the phase recovering algorithm; calculating the object surface deformation according to the variation of the shape and appearance of the speckles on the object surface during heat deforming, so as to measure the deformation strain of the surface of the measured object and the displacement in the whole field on real time. With the adoption of the method, the object deformation can be measured in the whole field on real time by passing through the flame smoke; the real-time whole-field deformation measurement can be performed for the object which is deformed and even damaged due to stressing or heating in the flame smoke environment.

Description

technical field [0001] The invention relates to a method for measuring deformation of an object passing through smoke in a flame and smoke environment, and belongs to the technical fields of structural deformation measurement and photomechanical measurement. Background technique [0002] Restoration of blurred images through scattering media has been a long-term research issue. Through some image processing methods, people try to recover the clear original image of objects passing through scattering media through some image processing methods. A lot of research work has been done in the field of biological tissue imaging research. Since the 1970s, the restoration of blurred images through phase recovery algorithms has become a research hotspot, seeking a method to restore the clear original image of objects from the blurred images obtained by laser light or narrow-band light emitted by objects through non-uniform scattering media. In the following 30 years, many methods and...

AI Technical Summary

Problems solved by technology

However, the digital image correlation method is very sensitive to the brightness fluctuation of the illumination speckle of the light source, and in some test environments due to environmental interference, such as the flame and smoke wrapped in the test piece in a high-temperature heating environment, the surface scatter of the test piece captured by the camera is very sensitive. The speckle image is distorted or even blurred, and the digital image method cannot be used for deformation calculation directly using the blurred image.

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