A full-field deformation measurement device for high-speed aircraft thermal surface based on optical method

Abstract

The invention provides an optical method based high-speed aircraft hot surface full-field deformation measuring device. The optical method based high-speed aircraft hot surface full-field deformation measuring device comprises a double-layer quartz lamp heating array, a thin-wall high-speed aircraft shell, a square transparent window, speckle particles, a thermocouple sensor, a signal amplifier, a temperature control computer, a driving power supply, a CMOS (Complementary Metal Oxide Semiconductor) camera, a lens, a narrow-band-pass optical filter and an image processing computer. In order to solve the problem of signal blockage caused by a high temperature radiant heat source between the CMOS camera and the surface of the high-speed aircraft shell, the vertical double-layer quartz lamp heating array is designed and the square transparent window with small area is formed, so that the optical camera lens can obtain images of the hot surface of the high-speed aircraft through the transparent window. The interference light ray of the quartz lamp heating array is shielded by selecting the narrow-band-pass optical filter with specific wave length, so that speckle images with high quality and no degeneration on the hot surface of the high-speed aircraft is obtained; a digital image correlation method is utilized for analyzing the speckle images under different temperatures to realize full measurement on the displacement field and the strain field of the hot surface of the high-speed aircraft in a high temperature environment.

Description

technical field [0001] The invention relates to an optical method-based full-field deformation measurement device for a hot surface of a high-speed aircraft. Especially when conducting thermal strength tests of high-speed aircraft such as missiles, non-contact optical methods can be used to measure the full-field deformation of the front surface of high-speed aircraft. It provides an important test method for thermal strength analysis and safety and reliability design of high-speed missiles and high-speed aerospace vehicles. Background technique [0002] Hypersonic aircraft can achieve global long-distance and rapid arrival, implement effective high-altitude and high-speed penetration, and complete rapid and precise strikes. Due to its extremely important military application value and great strategic significance, hypersonic vehicles have become the focus of research by major aerospace powers in the world. [0003] In order to achieve the strategic goal of quickly reachin...

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Problems solved by technology

As a result, the intensity of light emitted by the infrared radiation heat source array is greater than that emitted by the heated body, so the problem of aliasing interference caused by high-temperature light sources must be solved

Due to the above reasons, so far, there have been no relevant reports in the domestic and foreign literature on the successful measurement of the thermal surface deformation of high-speed aircraft structures using optical measurement methods in a high-temperature thermal radiation environment.

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