Frequency domain photics coherent chromatography imaging method and system with large detecting depth

Abstract

A frequency domain optical coherent tomography method with large detection depth and a system are provided. The system adopts a folding spectrum detection method to realize the spectrum detection of broadband with high resolution. The thought is that a broadband spectrum with the bandwidth of Delta Lambada is folded into a plurality of narrow wavelength windows of Delta Lambada 1, Delta Lambada 2-, delta Lambada n. High resolution detection is realized on every spectrum band. Then, all spectrum bands are synthesized into a broadband through splicing. The folding of the spectrum bands is realized through a combined diffraction grating. A rotating sub-grating regulates the incident angle im of the incident light to every grating, which leads to that the diffraction light direction of the relative wavelength window Delta Lambada m of every sub-grating is distributed within the same range. Then, the diffraction lights of all spectrum bands are focused on the detection surface of a spectrum detection array through a toroidal focusing mirror. Through the spectrum folding, the invention increases the effective detection pixel number N of the spectrum detection and improves the detection depth of the optical coherent tomography system and the signal-noise ratio of chromatogram.

Description

technical field [0001] The invention relates to optical coherence tomography, in particular to a frequency-domain optical coherence tomography method and system with a large detection depth. Background technique [0002] Optical coherence tomography (OCT) is an optical imaging technology developed in recent years. High-rate imaging has important application prospects in the fields of biological tissue imaging and medical detection. [0003] Frequency domain optical coherence tomography (Fourier Domain Optical Coherence Tomography, referred to as FD-OCT) is a new type of OCT system, which obtains the tomogram of the object by detecting the interference spectrum and inverse Fourier transforming it. Optical coherence tomography (Time Domain Optical Coherence Tomography, referred to as TD-OCT) has the advantages of no need for depth direction scanning, fast imaging speed and high detection sensitivity, and is more suitable for real-time imaging of biological tissues. [0004] ...

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Problems solved by technology

[0009] In order to overcome the shortcomings of the above-mentioned prior art, such as limited light source intensity and reduced detection speed, the present invention proposes a frequency-domain optical coherence tomography method and system to improve the detection depth and tomographic signal of the optical coherence tomography system. Noise ratio, simplify the system, and avoid errors caused by mechanical movement

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