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Optical system based on double-pulse digital speckle transient measurement

A digital speckle and optical system technology, applied in optics, measuring devices, optical components, etc., can solve the problems of poor signal-to-noise ratio of speckle images, uneven light intensity on the surface of illuminated objects, etc., achieve uniform light intensity distribution, eliminate The effect of uneven spot and high laser energy

Inactive Publication Date: 2013-03-20
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of uneven light intensity on the surface of the object irradiated by the traditional speckle measurement system and the poor signal-to-noise ratio of the speckle image, and realize the acquisition of the instantaneous vibration profile

Method used

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  • Optical system based on double-pulse digital speckle transient measurement

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Embodiment 1

[0019] An optical system based on double-pulse digital speckle transient measurement of the present invention includes a light source 1, an optical transmission system 2, and a photoelectric receiving system 14, such as figure 1 Shown; Described optical path transmission system 2 is made of attenuation sheet 3, the first sheet of long-focus lens 4, metal pinhole 5, the second sheet of long-focus lens 6, the first sheet of broadband dielectric reflector 7, beam expander 8, A collimating mirror 9, a second broadband dielectric mirror 10 and a dichroic prism 11 are formed; the photoelectric receiving system 14 is composed of an eyepiece 12 and a CCD camera 13;

[0020] The light source 1 adopts a double-pulse laser, and the coherence length is greater than 0.5m. The laser generates high-energy laser pulses, and the double-pulse interval and repetition frequency are continuously adjustable.

[0021] The working mode of the CCD camera 13 is a double exposure mode, and the imaging ...

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Abstract

The invention relates a transient speckle measurement optical system based on a double-pulse laser, and belongs to the field of dynamic mechanical quantity laser measurement. The system comprises a light source, a light path transmission system and a photoelectric receiving system; the light source emits double-pulse laser, the energy of the laser is adjusted by an attenuation piece, and the space filtering is carried out for speckles of the laser by a space filtering mirror group which consists of a first long focal length lens, a metal pinhole and a second long focal length lens; the light beam passes through a second reflector after the space filtering is expanded and collimated by a first reflector, an expanded beam lens and a collimating lens, and is divided into a path of measurement light and a path of reference light through a beam splitter prism to be incident on a measured surface and a reference surface respectively; the two paths of scattered light are gathered after passing through the beam splitter prism, and are interfered mutually; and the interfered light beam is imaged on the receiving surface of a CCD (Charge-Coupled Device) camera by an eyepiece. The system obtains speckle images of transient vibration of an object structure surface in an adjustable time interval; and the signal to noise ratio of the obtained speckle images is high.

Description

technical field [0001] The invention relates to a digital speckle interferometry technology, in particular to a transient speckle measurement optical system based on a double-pulse laser, and belongs to the field of dynamic mechanical quantity laser measurement. Background technique [0002] Digital speckle interferometry obtains the vibration information of each point on the measured surface through the collection and demodulation of the full-field speckle interference pattern, which can be used in the full-field vibration, displacement and strain measurement. This technology has non-contact, high resolution, Real-time and other advantages play an extensive and important role in the development and production of military products. [0003] The Chinese utility model patent number is "CN92226915.7", and the name is "a portable electronic speckle interferometer optical head". The electronic speckle interferometer optical head disclosed in this utility model uses a semiconducto...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26G01H9/00G02B27/48
Inventor 张大治温聚英王晶晶薛景锋
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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