OCT conjugated mirror image removal device and method capable of eliminating multicolor errors

A conjugate and error technology is applied in the field of OCT conjugate mirror removal devices to achieve the effects of improving system error tolerance, eliminating the influence of multi-color errors, and improving error tolerance

Pending Publication Date: 2018-12-07
FUZHOU UNIV
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This inevitably creates a contradiction in the choice of light source bandwidth

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  • OCT conjugated mirror image removal device and method capable of eliminating multicolor errors
  • OCT conjugated mirror image removal device and method capable of eliminating multicolor errors
  • OCT conjugated mirror image removal device and method capable of eliminating multicolor errors

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Embodiment Construction

[0030] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0031] Aiming at the problem that the traditional phase-shifting method will be affected by the polychromatic error produced by the broadband light source and cannot be perfectly removed when removing the conjugate image, an OCT conjugate image removal method that can eliminate the polychromatic error is proposed. The method proposed in the patent of the present invention does not use the fixed phase shift corresponding to the central wavelength to calculate the signal reconstruction of the interference signal, but uses the wavelength of the broadband light source to correct the fixed phase shift, and calculates a set of The amount of phase shift that changes. Because the corrected phase shifts are error-free, the reconstructed interference signal is not affected by the polychromatic error of the broadband light source. Performing fast Fourier...

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Abstract

The invention provides an OCT conjugated mirror image removal device and method capable of eliminating multicolor errors. The device includes a CCD camera, a ruling grating, an upper computer, a piezoelectric ceramic, a beam splitter, a sample, an objective lens, a GRIN fiber collimator, and a super radiance light emitting diode. Through adoption of the device and the method, signal reconstructionis performed on an interference signal, fixed phase shift amount is corrected by utilizing the wavelength of a broadband light source, and a set of varying phase shift amount is calculated, and because the corrected phase shift amount is error-free, the reconstructed interference signal is not affected by the multicolor errors of the broadband light source. Rapid Fourier transform is performed onthe interference signal to eliminate a conjugated mirror image, and the detection depth of a system is doubled. Without increasing the amount of data of traditional phase shifting methods, the effectof the multicolor errors of the broadband light source is completely removed, and the error tolerance of the system is improved.

Description

technical field [0001] The invention relates to an OCT conjugate image removal device and method capable of eliminating polychromatic errors. Background technique [0002] Most of the traditional phase shifting methods use the data acquisition card to control the voltage output to drive the piezoelectric ceramics for phase shifting. Interference information with different phase differences relative to the center wavelength of the light source is obtained by this method. In the process of signal reconstruction, the phase shift at each wavelength is replaced by the fixed phase shift at the center wavelength. The conjugate image rejection ratio obtained by performing fast Fourier transform on the reconstructed interference signal is greatly affected by the polychromatic error caused by the bandwidth of the light source. The increase in the bandwidth of the detection light source can improve the longitudinal resolution of the OCT system. This inevitably creates contradictions...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45
CPCG01N21/45
Inventor 钟舜聪林杰文张秋坤
Owner FUZHOU UNIV
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