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OCT system sensitivity measuring method and device

A technology of system sensitivity and measurement method, applied in the field of OCT system sensitivity measurement method and measurement device, can solve problems such as non-representation of noise performance, and achieve the effect of convenient measurement method, easy operation and low cost

Active Publication Date: 2021-05-07
WUHAN AGESI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the photoelectric conversion in the OSA and beam profiler is actually different from the photoelectric receiver in the OCT system, so the obtained signal-to-noise ratio does not represent the noise performance of the entire OCT system

Method used

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  • OCT system sensitivity measuring method and device
  • OCT system sensitivity measuring method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0094] A kind of OCT system sensitivity measurement method, comprises the steps:

[0095] Step 1: The scanning light source sends out a light signal;

[0096] Step 2: dividing the optical signal into an initial sampling optical signal and an initial reference optical signal;

[0097] Step 3: The initial reference optical signal enters the reference arm;

[0098] Step 4: The initial sampling optical signal enters the sampling arm, and the sampling optical signal undergoes two fixed attenuations in the sampling arm (the fixed attenuation is the first attenuation), and the attenuation of the two fixed attenuations is 2×35dB, that is, the first The attenuation is 35dB, and at the same time, after reaching the plane mirror through the fiber optic lens, it is reflected back to the fiber optic lens, and the emissivity of the plane mirror is 80%;

[0099] Step 5: The output reference optical signal reflected from the reference arm interferes with the output sampling optical signal r...

Embodiment 2

[0102] Embodiments 2 and 3 are different from Embodiment 1 in that the first attenuation and the emissivity of the plane mirror in Embodiment 2 and Embodiment 3 are different. The first attenuation in Example 2 is 37.5 dB, and the reflectivity of the plane mirror is 90%. In Example 3, the first attenuation is 40 dB, and the reflectivity of the plane mirror is 100%.

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Abstract

The invention discloses an OCT system sensitivity measuring method. The method comprises the following steps that: a scanning light source emits an optical signal; the optical signal is divided into an initial sampling optical signal and an initial reference optical signal; the initial reference light signal enters a reference arm; the initial sampling optical signal enters a sampling arm, and the sampling optical signal is attenuated for 2N + 1 times in the sampling arm; an output reference light signal reflected from the reference arm and an output sampling light signal reflected from the sampling arm interfere with each other to form an interference light signal; the interference light signal is converted into an electric signal; and the electric signal is converted into an FFT frequency spectrum, a signal-to-noise ratio is obtained through the FFT frequency spectrum, and the OCT system sensitivity is calculated. The OCT system sensitivity is equal to the sum of the attenuation amount of the sampled optical signals and the signal-to-noise ratio, the OCT system sensitivity is S, the attenuation amount of the sampled optical signals is FA, and the signal-to-noise ratio is SNR, namely S = FA + SNR; the attenuation amount of the sampling optical signal is equal to 2N * the first attenuation amount + the second attenuation amount; and n > = 1. The invention further provides an OCT system sensitivity measuring device.

Description

technical field [0001] The present application relates to the technical field of optical interference tomography, in particular to an OCT system sensitivity measurement method and a measurement device. Background technique [0002] Optical interference tomography (OCT) is a biomedical imaging technique similar to ultrasound. It obtains cross-sectional images and three-dimensional images of biological tissues by measuring the backscattered light or reflected light of the sample. It has the advantages of non-invasiveness, high resolution, and in-vivo imaging. It has been widely used in ophthalmology, dermatology, and cardiovascular. Clinical diagnosis and research in internal medicine, etc. [0003] Early OCT systems were mainly based on time-domain OCT. In order to improve the imaging speed of the OCT system, the researchers proposed the frequency-domain OCT system. Compared with time-domain OCT, frequency-domain OCT has higher sensitivity. Sensitivity reflects the abilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/02G01M11/0207
Inventor 王正义明良裕侯利平冯庆宇吴振英
Owner WUHAN AGESI TECH CO LTD
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