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Two-channel optical three-dimensional interference method based on underdetermined blind source separation

An underdetermined blind source separation, dual-channel technology, applied in the field of dual-channel optical three-dimensional interference method and system based on underdetermined blind source separation, can solve problems such as the inability to use the inverse matrix and solve the source signal

Inactive Publication Date: 2019-09-20
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0004] In the prior art, since the number of observation signals is less than the number of source signals, the source signal cannot be solved in the form of an inverse matrix; if the noise fluctuation is too strong and the amplitude of the interference signal is small, it is easy to make the two Closer interfering signals are aliased into one signal

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  • Two-channel optical three-dimensional interference method based on underdetermined blind source separation
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  • Two-channel optical three-dimensional interference method based on underdetermined blind source separation

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Embodiment Construction

[0084] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0085] Described in this embodiment is a two-channel laser wavenumber scanning three-dimensional interferometry system, such as figure 1 As shown, the system mainly includes a semiconductor laser, a laser controller, a temperature control module, an optical wedge, a CCD camera, a beam splitter, a computer, a liquid crystal sheet, lens L1, lens L2 and slide glass.

[0086] The key device of the imaging optical path in this embodiment is a CCD camera, and the CCD camera is required to have a large dynamic range, high resolution and fast response speed. Since the slide-type test piece is greatly affected by the environment and temperature, the indoor temperature should be kept constant and stable during the experiment.

[0087] This embodiment provides a glass slide interfer...

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Abstract

The invention discloses a two-channel optical three-dimensional interference method based on underdetermined blind source separation. On the basis of interference data collected by a CCD camera, interference signals between surfaces of tested pieces of glass slides are processed by blind separation and thus interference signal parameters are calculated, wherein the interference signal parameters include an interference signal amplitude frequency and an interference signal phase frequency; according to a two-channel optical three-dimensional Michelson interference experiment, estimation of a mixed matrix is obtained based on a K-means clustering algorithm and source signal recovery is realized by an L1 norm shortest path method; and then laser wave number scanning is performed and four-surface interference signals are obtained by blind separation accurately by using light intensity values collected by the CCD camera, thereby realizing blind separation of the four-surface interference signals. Compared with the ordinary interference measurement method not being capable of identifying all peak locations accurately, the disclosed two-channel optical three-dimensional interference method has the following advantages: with two-channel detection and sampling, blind source separation is performed and locations of all interference signals can be detected even when the signals face the strong noises.

Description

technical field [0001] The invention relates to the technical field of two-channel laser wavenumber scanning three-dimensional Michelson interference, in particular to a two-channel optical three-dimensional interference method and system based on underdetermined blind source separation. Background technique [0002] Interference refers to the superposition of two columns of coherent waves that meet certain conditions. In the superposition area, the vibration at some points is always strengthened, and the vibration at some points is always weakened, that is, the vibration intensity has a stable spatial distribution in the interference area. In the measurement of various parameters, interferometry has high test sensitivity and accuracy, and is a high-precision measurement method. [0003] Blind source separation refers to recovering the source signal only based on the observed mixed signal under the condition that the source signal and the transmission channel process are unk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/2441G01B9/02004G01B9/02084G01B9/02021G01B9/02028G01B9/02032G01B9/02055G01B9/02083G01B9/02044G01J3/2823
Inventor 周延周任燕
Owner GUANGDONG UNIV OF TECH
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