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 invention relates to a frequency domain optical coherence tomography (Fourier-Domain Optical Coherence Tomography, FD-OCT for short), in particular to a parallel complex frequency domain optical coherence tomography system and method with sinusoidal phase modulation. Background technique [0002] Optical Coherence Tomography (Optical Coherence Tomography, OCT) is an optical tomography technology developed in recent years. It can perform high resolution on high-scattering media such as tiny structures within a few millimeters of depth within biological tissues. Non-invasive imaging has broad application prospects in the fields of biological tissue imaging and medical imaging diagnosis. [0003] The frequency domain optical coherence tomography system (FD-OCT) is a new type of OCT system, which obtains the tomogram of the object by detecting the interference spectrum and performing the inverse Fourier transform on it. Compared with the earlier time domain o...

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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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