Double-channel full-range complex-spectral-domain optical coherence tomographic system

Abstract

The invention discloses a double-channel full-range complex-spectral-domain optical coherence tomographic system. A 3X3 fiber coupler splits light to form two reference arms and a sample arm. By using the spectral-domain optical coherence tomographic system composed of the two reference arms and the sample arm to detect samples at different depth, detection depth can be increased and imaging quality can be improved. The optical coherence tomographic system can be used for vividly imaging the deep samples by the aid of one light source and one spectrometer. The double-channel full-range complex-spectral-domain optical coherence tomographic system has potential application value for detecting high-scattering biological tissues and industrial samples.

Description

technical field [0001] The present invention relates to a complex frequency domain optical coherence tomography system, in particular to a 3-based The invention discloses a dual-channel frequency-domain optical coherence tomography system of 3 fiber couplers, belonging to the field of optical imaging. Background technique [0002] Frequency-domain optical coherence tomography is a tomographic imaging technique that can provide high resolution, high sensitivity, non-contact, and non-destructive. The detection depth of this technology has always been limited: the Fourier transform of the interference spectrum in image processing has Hamiltonian symmetry, and the image of the reconstructed sample is symmetrical with respect to the equal optical path difference between the reference arm and the sample. In order to avoid the interaction between the real image and the conjugate image Overlapping, only half of the complex space is used for imaging; in addition, the detection dept...

AI Technical Summary

Problems solved by technology

Among them, the first two methods are limited by the capabilities of spectrometers and light sources. The third method can expand the detection depth to twice the depth, but is affected by the dynamic capabilities of phase shifters such as PZT and system noise. The fourth method can be based on the imaging position. Flexible light focusing, but this method requires two independent optical coherence tomography systems, which increases the complexity and cost of the system

In addition, the above methods have not paid attention to the unfavorable factors of sensitivity reduction while expanding the detection depth: the sensitivity decreases with the imaging depth, so the imaging quality rapidly decays with the increase of the detection depth

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