Pneumatic optical wavefront ultra-high frequency measurement system and method

Abstract

The invention provides a pneumatic optical wavefront ultra-high frequency measurement system. The pneumatic optical wavefront ultra-high frequency measurement system comprises a first dual-cavity laser device and a second dual-cavity laser device, a first semi-transparent mirror opposite to a light outlet of the first dual-cavity laser device, a first reflector opposite to the light outlet of the second dual-cavity laser device, a first CCD (charge coupled device) camera and a second CCD camera, a synchronous controller, a computer system, a second semi-transparent mirror, a second reflector, a background image, a convex lens and a pore, wherein the first CCD camera and the second CCD camera are arranged in parallel; the computer system is connected to the first CCD camera, the second CCD camera and the synchronous controller; the second semi-transparent mirror is opposite to the lens of the second CCD camera; the second reflector is opposite to the lens of the first CCD camera; the backlight image, the convex lens and the pore are respectively arranged at two opposite sides of a wind tunnel experiment module; the backlight image and the second dual-cavity laser device are arranged at the same side; and the first CCD camera, the second CCD camera, the first dual-cavity laser device and the second dual-cavity laser device are connected to the synchronous controller respectively. The invention also relates to a measurement method. According to the method, the shot background image is subjected to analysis calculation by the computer, so that ultra-high frequency measurement of whole-field pneumatic optical wavefront distortion is achieved.

Description

technical field [0001] The invention relates to the field of aerospace, in particular to an aero-optical wavefront ultra-high frequency measurement system used in the fields of supersonic imaging guidance, aerial photography, airborne telescope and the like. Furthermore, the invention also relates to a method comprising the above-mentioned measuring system. Background technique [0002] The aero-optical wavefront measurement technique can be used to study the aero-optical effects encountered in the fields of supersonic imaging guidance, aerial photography and airborne telescopes. There are many existing measurement methods, such as: interferometry, small aperture beam technology and Malley probe measurement method. The commonly used Malley probe measurement method uses a position sensor to measure the deflection of the beam at a very high frequency, which can only measure a single point wavefront and cannot perform full-field measurement. The Malley probe measurement metho...

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However, in the actual flow field, the convective velocity is unsteady, and the flow field structure also develops and changes, so the assumption of frozen flow is not strictly correct

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