Axial resolution measurement method of OCT system
A measurement method and resolution technology, applied in the field of optical detection, can solve problems such as inability to measure quickly, unsuitable for axial resolution measurement, complicated operation, etc., and achieve the effect of convenient measurement method, low cost and easy operation
Active Publication Date: 2020-12-11
SUZHOU MICROPORT ARGUS MEDICAL CORP
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Problems solved by technology
[0003] The current measurement methods for measuring axial rate resolution are often complicated to operate, cannot be measured quickly, and are not suitable for measuring the axial resolution of OCT in industrial applications.
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[0041] Carry out axial resolution measuring method for an OCT system (Argus OCT System Insight-100), described method comprises the steps:
[0042] (1) The central wavelength of the OCT system is 1310nm, the sweep bandwidth is 105nm, the sweep frequency is 50KHz, and the number of sweep sampling points is 2048. The incident light emitted by the weakly coherent light source is divided into reference light and sampling light with a ratio of 10:90 through a 10:90 beam splitter. The reference light enters the reference arm equipped with a plane reflector; the reference arm is equipped with a plane reflector, and the reference light Reflected by the flat mirror back to the OCT system. The sampling light enters the sampling arm, wherein the port of the sampling arm is connected with a fiber optic lens, and the optical path length of the reference arm is equal to the optical path length of the sampling arm of the OCT system. The sampling light is irradiated onto the sampling plane m...
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The invention provides an axial resolution measurement method of an OCT system. The method comprises the following steps: dividing weak coherent light into reference light and sampling light, reflecting the reference light back to the OCT system through a reflector of a reference arm, and reflecting the sampling light back to the OCT system through an optical fiber lens and a sampling object, wherein the sampling light and the reference light which are reflected back to the system interfere with each other in the OCT system to form an interference light signal; converting the interference light signal into an electric signal, and processing the electric signal to obtain an FFT frequency spectrum; and enabling the sampling object to move away from the optical fiber lens by a displacement delta z, and changing a serial number corresponding to the peak value of the FFT frequency spectrum into delta N, wherein the ratio of the delta z to the delta N is the axial resolution of the OCT system. The method for obtaining the axial resolution of the OCT system is convenient, effective and low in cost, and the measurement method can be used for OCT systems with different wavelengths and frequencies and has universal applicability.
Description
technical field [0001] The invention relates to a method for measuring the axial resolution of an OCT system, which is suitable for the technical field of optical detection. Background technique [0002] In recent decades, the field of biomedical science has developed rapidly, and the research of life science has changed from traditional qualitative research to quantitative research, which puts forward high requirements for optical detection technology. The concept of Optical Coherence Tomography (OCT) has been developed rapidly in the past ten years since it was first proposed at the Massachusetts Institute of Technology in 1991. As an emerging optical detection technology, OCT can observe the tissue structure below the surface of the organism without damage, and has the high resolution required for histopathological analysis. It is expected to become an important means of biological optical imaging research. In order to meet the needs of more and more extensive basic rese...
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IPC IPC(8): A61B5/00
CPCA61B5/0066A61B5/0033
Inventor 王正义侯利平明良裕冯庆宇吴振英
Owner SUZHOU MICROPORT ARGUS MEDICAL CORP