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Compensative filtering apparatus in multi-sequence laser shadowgraph

A technology for compensating filter devices and laser shadows. It is applied to filters for photography, cameras, optics, etc. to achieve uniformity, improve imaging uniformity, and eliminate interference fringes.

Active Publication Date: 2016-03-23
中国空气动力研究与发展中心超高速空气动力研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a device that realizes 2-8 sequential imaging of ultra-high-speed target change processes, and solves the problems of imaging spot uniformity and stray light filtering in the sequence imaging of ultra-high-speed target change processes

Method used

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  • Compensative filtering apparatus in multi-sequence laser shadowgraph
  • Compensative filtering apparatus in multi-sequence laser shadowgraph
  • Compensative filtering apparatus in multi-sequence laser shadowgraph

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Embodiment 1

[0024] The layout diagram of the compensation filter device in the sequence imaging optical path is as follows image 3 As shown, the beam (901) from the collimating system (10) in the multi-sequence laser shadow imaging is split by the first beam splitter (601) into a first sequence of beams (903) and a second sequence of beams (904) In the first sequence of beams (903), the first collimator (701) is placed first, and then the first compensation filter device (101) and the first imaging CCD (801) are placed. The second series of beams (904) are then divided into a third series of beams (905) and a fourth series of beams (902) by the second beam splitter (902), and the second collimator is placed first in the third series of beams (905) Mirror (702), and then place a second compensation filter device (102) and a second imaging CCD (802).

[0025] Wherein, the placement position of the compensation filter device in the other sequence beams is similar to the first sequence beam (9...

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Abstract

The invention belongs to the field of ultrahigh-speed transient imaging and relates to a compensative filtering apparatus in multi-sequence laser shadowgraph. The apparatus comprises a density wedge filter, an imaging objective lens and a filter lens, wherein for the density wedge filter, the clear aperture is 25mm, the material is BK7, and the optical density change range is 0.08-2.0 at the wavelength of 532nm; the imaging objective lens is 118mm in focus distance and 25mm in clear aperture; and the filter lens is 25.4mm in clear aperture, 532nm in central wavelength, 10nm in band width, 1.5mm in thickness and 75% in transmissivity during normal incidence, and is obliquely arranged at an angle of 10-30 degrees in a manner of being perpendicular to the direction of an optical axis. According to the apparatus, stray light generated in a light path is removed after the filter lens is arranged on the imaging objective lens; and the filter lens is obliquely arranged at the angle of 10-30 degrees in the manner of being perpendicular to the direction of the optical axis, so that interferometric fringes in the light path can be removed for improving imaging uniformity.

Description

Technical field [0001] The invention belongs to the field of ultra-high-speed transient imaging, and specifically relates to a compensation filter device in multi-sequence laser shadow photography. Background technique [0002] With the development of my country's aerospace technology, weapon equipment, and basic disciplines, research involving ultra-high-speed aerodynamics, ultra-high-speed collisions, explosions and shocks, combustion and chemical reactions, and other fields continue to deepen. In these researches, many phenomena are ultra-high-speed transient processes with a duration of only microseconds or even nanoseconds. A camera system is needed to clearly and continuously image and record this process in order to grasp the physical phenomena. Nature. This type of camera system requires 10 million frames per second (ie, the shortest exposure imaging time is 100ns), and can perform sequential imaging of ultra-high-speed transient changes. It must also ensure that the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B39/00G03B11/00G02B1/00G02B1/14G02B1/11
CPCG03B11/00G03B39/00G02B1/00G02B1/11
Inventor 谢爱民黄洁宋强文雪忠柯发伟李晶姜林柳森
Owner 中国空气动力研究与发展中心超高速空气动力研究所
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