Sinusoidal phase modulation parallel complex frequency domain optical coherence tomography imaging system and method

Abstract

The invention relates to a sinusoidal phase modulation parallel complex frequency domain optical coherence tomography imaging system and a method. The method and the system are characterized in that on the basis of the parallel frequency domain optical coherence tomography imaging system and method, a reflective space sinusoidal phase modulation device is used for replacing a reference plane reflecting mirror of an interference reference arm, two-dimensional frequency domain interference fringes obtained on a two-dimensional photoelectric detector array are introduced into a space to be subjected to sinusoidal phase modulation, i.e. spatial carriers are introduced into the two-dimensional frequency domain interference fringes; and then, the two-dimensional frequency domain interference fringes containing the spatial carriers are subjected to spatial Fourier transform analysis, two-dimensional complex frequency domain interference fringes are obtained, and finally, the chromatographic profile of samples to be measured is obtained through the inverse Fourier transform in the optical frequency direction. The system and the method have the characteristics that the structure is simple, the imaging speed is high, the sensitivity on the motion blur is low, and the samples to be measured are always in a region with higher sensitivity. The chromatographic profile of samples to be measured can be obtained only through once exposure.

Description

technical field [0001] The present invention relates to frequency-domain optical coherence tomography (Fourier-Domain Optical Coherence Tomography, referred to as FD-OCT), in particular to a sinusoidal phase modulated parallel complex frequency-domain optical coherence tomography system and method. Background technique [0002] Optical coherence tomography (OCT for short) is an optical tomography technology developed in recent years. Non-invasive imaging has broad application prospects in the fields of biological tissue imaging and medical imaging diagnosis. [0003] Frequency-domain optical coherence tomography (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. Compared with the earlier time-domain optical coherence layer Time-Domain Optical Coherence Tomography (TD-OCT) has the advantages of no need for depth direction scanning, fast imaging speed and high detection sen...

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Problems solved by technology

However, with the increase of the horizontal parallel detection range, part of the lateral position of the object to be measured will be in a low-sensitivity area, and the quality of the tomographic image will be reduced; moreover, the inclined plane reflective diffraction grating will cause dispersion of the spatial carrier frequency. Affects frequency domain OCT spurious image removal effect

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