Testing device for inhibiting dithering of speckle image under aerobic environment with high temperature of 1200 DEG C

Abstract

The invention discloses a testing device for inhibiting dithering of a speckle image under an aerobic environment with high temperature of 1200 DEG C. The device comprises a light-weight high-temperature ceramic plate, an orthogonal quartz lamp heating array, a light-pervious window, a light-weight ceramic thermal-insulation frame, speckle particles, a panel test piece, a quartz glass square frame, a thermal-insulation light-pervious channel, a light-pervious hole, an MOS camera, a band pass filter, a lens and an image processing computer. In a high-temperature heat test, the temperature rises, the density of hot air decreases, the hot air moves upward, and the difference in upper and lower air densities in a heating area causes an unsteady change in the refractive index of the air to cause dithering of an image, so that the correlation analysis of a digital image fails. In order to obtain a clear image of surface deformation before heating, the invention comprehensively adopts multi-level multi-segment space sealing and area isolation measures to inhibit dithering of the hot air in an effective transfer path of optical information, thereby obtaining a clear speckle image of surface deformation of the part before being heated in an aerobic environment with high temperature and the full field deformation of the heated surface.

Description

technical field [0001] The invention relates to a test device for suppressing speckle image shaking in a 1200°C aerobic high-temperature environment. Especially when the non-contact optical method is used for high-temperature deformation measurement, the vibration of hot air can be suppressed, and a clear speckle image of the hot surface can be obtained, and then the high-temperature deformation data of the whole field can be obtained, which provides a basis for the thermal strength analysis and safety reliability design of high-speed aircraft. Important experimental testing means. Background technique [0002] When a high-speed aircraft flies in the atmosphere at a high Mach number, it rubs against the air violently to produce serious aerodynamic heating. The harsh aerodynamic thermal environment causes the temperature of the outer surface of the aircraft to rise sharply, and the mechanical properties of the materials and structures of the aircraft change. The thermal stra...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: when measuring high temperature deformation based on non-contact optical method in an aerobic high temperature environment, suppress the influence of hot air shaking in the optical path on the image, and obtain a clear 1200°C hot surface speckle image and full field high temperature deformation

Images