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Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer

A time-resolved, reflective surface technology, applied in the direction of instruments, utilization of re-radiation, and re-radiation of electromagnetic waves, which can solve problems such as high cost, difficult adjustment, and complex system.

Inactive Publication Date: 2014-04-30
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Abstract
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  • Application Information

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Problems solved by technology

Using such a structure to realize spatial phase-shift surface imaging VISAR requires the use of four extremely large cross-section thin-core optical fiber image transmission bundles and one CCD camera with a large photosensitive area and high number of pixels. The system is complex, difficult to adjust, and costly. expensive

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  • Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer
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  • Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer

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Embodiment Construction

[0032] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0033] like figure 2As shown, the ultra-high time-resolution surface imaging VISAR optical path in the present invention adopts two interferometric velocimetry cavities, and the ultrashort pulse light emitted by the pulsed laser source L is focused on the surface of the sample T to be measured by the imaging lens I after passing through the input interferometric cavity VISAR1, The diffusely reflected light on the surface of the sample T to be measured is collected by the imaging lens I and split into the mirror M by the beam splitter B, and then reflected into the output interference cavity VISAR2, where it interferes to form comb-shaped interference fringes, and then the CCD Camera C records this comb pattern. The pulse width of pulsed lasers can range from picoseconds to hundreds of picose...

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Abstract

The invention discloses an ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer which comprises a pulse laser source, an input interference velocity measurement cavity, an output interference velocity measurement cavity, a beam splitter, a reflecting mirror, an imaging lens and CCD cameras. Pulses transmitted by the pulse laser source enter the input interference velocity measurement cavity, the pulses output by the input interference velocity measurement cavity are focused to a target surface to be tested through the imaging lens, the pulses reflected back from the target surface to be tested are collected through the imaging lens and are split to the reflecting mirror, then the pulses are reflected to the output interference velocity measurement cavity, and comb-type interference fringes output by the output interference velocity measurement cavity are recorded by the CCD cameras. Through the implementation of the ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer, ultrahigh time resolution can be achieved, space phase shifting face imaging can be achieved based on the ultrahigh time resolution, four interference fringe images can be recorded simply through the two CCD cameras, and higher velocity resolution can be achieved.

Description

technical field [0001] The invention belongs to the technical field of laser interference testing, and in particular relates to an ultra-high time resolution space phase shift surface imaging arbitrary reflection surface velocity interferometer capable of realizing time and space resolution velocity measurement. Background technique [0002] At present, the laser interferometry technology based on imaging principle is mainly wired imaging arbitrary reflective surface velocity interferometer (VISAR) and sub-frame imaging arbitrary reflective surface velocity interferometer. They are the development of traditional point VISAR technology, and replace the "bull's eye" ""-shaped ring pattern, use a scanning camera or a framing camera to record the change process of one-dimensional or two-dimensional comb-shaped interference fringes over time, and the recording image surface has an object-image relationship with the target surface, which can realize spatial resolution. Line imagin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/58G01S7/481
CPCG01S7/481G01S17/58
Inventor 刘寿先彭其先陈光华李泽仁邓向阳雷江波王德田刘俊袁树云
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS