Wavelength calibration method based on light source spectrum characteristic wavelength

A technology of spectral characteristics and calibration methods, applied in spectrometry/spectrophotometry/monochromator, radiation pyrometry, measurement optics, etc., can solve the problems of high experimental cost and requirements, and failure to achieve universality , to achieve the effect of precise mapping

Inactive Publication Date: 2019-01-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Although its calibration accuracy is high, this method uses 5 additional Bragg gratings with the same reflectivity and narrow bandwidth, so its experimental cost and requirements are high, and it has not achieved good universality

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  • Wavelength calibration method based on light source spectrum characteristic wavelength
  • Wavelength calibration method based on light source spectrum characteristic wavelength
  • Wavelength calibration method based on light source spectrum characteristic wavelength

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] A wavelength calibration method based on the spectral characteristic wavelength of the light source proposed by the present invention can be applied to the spectral domain optical coherence tomography system (SD-OCT), such as figure 1 Shown is the device diagram of the SD-OCT system built in this embodiment, including laser light source 1, optical isolator 2, coupler 3, reference arm module 4, sample arm module 5, fast spectrometer 6 and host module 7. The light emitted by the laser light source 1 passes through the optical isolator 2 and then enters the coupler 3 . The light reflected back by the reference arm module 4 and the sample arm module 5 enters the coupler 3 , interferes in the coupler 3 and is input into the fast spectrometer 6 . The fast spectrometer 6 is used to detect interference spectrum signals. One end of the host mod...

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Abstract

The invention discloses a wavelength calibration method based on light source spectrum characteristic wavelength, and belongs to the technical field of the spectrum calibration. The method is used forperforming wavelength calibration on light emitted by a laser source in a spectral domain optical coherence tomography system, and comprises the following steps: step one, constructing a rapid spectrometer to collect interference light in the spectral domain optical coherence tomography system, wherein the rapid spectrometer comprises a collimator, an optical grating, a focusing lens and a lineararray CCD camera, the interference light produces diffraction at the optical grating after passing through the collimator, thereby producing diffracted light, the diffracted light is detected by thelinear array CCD camera after being focused through the focusing lens; step two, extracting wavelength values of wave crest and wave trough in a diffracted light spectrum detected by the linear arrayCCD camera as characteristic wavelengths, and cording a pixel point corresponding to each characteristic wavelength; and step three, performing polynomial fitting on each characteristic wavelength and the pixel point corresponding to the characteristic wavelength to obtain a fitting curve as the wavelength calibration curve. The wavelength calibration method disclosed by the invention does not need an additional wavelength calibration source and has high precision.

Description

technical field [0001] The invention belongs to the technical field of spectrum calibration, and relates to a wavelength calibration method based on the spectral characteristic wavelength of a light source, and is especially suitable for spectral domain optical coherence tomography. Background technique [0002] Optical coherence tomography (OCT) technology is a high-resolution biomedical imaging method that can perform two-dimensional cross-sectional and three-dimensional imaging of biological tissue structures by measuring the backscattered light of biological tissues. Due to its characteristics of non-invasive, non-contact, in vivo imaging, real-time imaging and high resolution, OCT has gradually been widely used in many fields and has a good development prospect. [0003] In the past decade, with the development of light source and detector technology, Fourier domain optical coherence tomography (FD-OCT), which is the second generation of OCT technology, has also develop...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J9/02G01J3/02
CPCG01J3/0297G01J9/0246
Inventor 罗锐汪平河史国华李和平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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