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Method for heterodyne temporal series speckle interferometry of object deformation

A time series, speckle interference technology, applied in the field of laser speckle interferometry, can solve the problems of blocking laser light, small clear aperture, reduced measurement area, etc., to simplify the detection system, improve the storage speed, and improve the accuracy.

Active Publication Date: 2010-07-07
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, this method also has certain disadvantages: 1. Rotating 1 / 2 wave plate belongs to mechanical rotation, the stability is not high, and the vibration generated by mechanical rotation has a certain impact on the entire optical system; 2. When rotating the wave plate, it will produce A certain deflection makes it impossible for the plane where the 1 / 2 wave plate is located to be perpendicular to the incident light during the rotation, which will have a certain impact on the phase during the measurement process; 3. The method used by C.Joenathan is a laser The outgoing light first passes through the spatial filter and then the frequency shifter. Since the laser beam passes through the spatial filter, the beam will expand, while the 1 / 2 wave plate and 1 / 4 wave plate have a small aperture due to the limitation of manufacturing technology. The expanded laser light is blocked, reducing the measurement area

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  • Method for heterodyne temporal series speckle interferometry of object deformation
  • Method for heterodyne temporal series speckle interferometry of object deformation
  • Method for heterodyne temporal series speckle interferometry of object deformation

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Embodiment Construction

[0018] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0019] Such as figure 1 As shown: the light source is a He-Ne laser 1, and the output frequency is linearly polarized light of ω, which is coupled into the lithium niobate polarization controller 2. The polarization controller obtains orthogonal linearly polarized light with two frequencies by applying an external voltage. And the heterodyne modulation frequency is changed by changing the voltage. The Jones vector for orthogonal linearly polarized light with two frequencies is:

[0020] E ‾ = A 2 expi ( ω + ...

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Abstract

The invention discloses a method for heterodyne temporal series speckle interferometry of object deformation, belonging to the laser speckle interferometry field. The method combines the temporal series speckle interferometry with the heterodyne interferometry, directly presents the phase function of a time-varying field and introduces frequency difference in order to guarantee the deformation measuring precision. The invention simplifies the object deformation detection system and is better adaptable to the memory speed of high speed CCD through a lithium niobate polarization controller.

Description

technical field [0001] The invention relates to the field of laser speckle interferometry, in particular to a method for measuring object deformation by heterodyne time series speckle interferometry. Background technique [0002] When the laser is irradiated on the surface of an object with diffuse reflection properties, according to the Huygens principle, every point on the surface of the object can be regarded as a point light source, and the light reflected from the surface of the object will coherently superimpose in space, and interference will occur in the entire space. The formation of randomly distributed bright and dark spots is called laser speckle. The speckle phenomenon generally exists in the optical imaging process and changes with the deformation or movement of the object. Initially, people mainly studied how to reduce the impact of speckle. However, during the research process, it was found that speckle has certain rules before and after object deformation, ...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 高瞻陈筱磊林泽鸣
Owner BEIJING JIAOTONG UNIV
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