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Cost-effective linear scanning optical coherence tomography device

A technology of optical coherence tomography and light interference, which is applied in measuring devices, material analysis through optical means, scientific instruments, etc.

Pending Publication Date: 2021-10-19
HONG KONG APPLIED SCI & TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Line generators are used to generate linear beams

Method used

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  • Cost-effective linear scanning optical coherence tomography device
  • Cost-effective linear scanning optical coherence tomography device
  • Cost-effective linear scanning optical coherence tomography device

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Embodiment Construction

[0038]As used herein, "linear beam" refers to a beam whose cross-section has the shape of a rectilinear line, wherein the cross-section is perpendicular to the direction of propagation of the beam. A section has a "section length" and a "section width," where the section length is longer than the section width. Typically, the section width is negligible compared to the section length. For example, linear beams that can be used to line-scan the human retina in OCT can have cross-sectional widths as low as a few micrometers and cross-sectional lengths that can be several millimeters or longer.

[0039] As used herein, the "beam size" of a light beam refers to the maximum one-dimensional length between any two points on the periphery of the beam cross-section, where the cross-section is perpendicular to the direction of propagation of the beam. Note that the cross-sectional length of a linear beam is capped by the beam size of the linear beam. For linear beams with negligible s...

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Abstract

The implementation cost of a line scanning optical coherence tomography (OCT) device is reduced by minimizing the size of the scanning mirror and using a light source with lower intensity uniformity requirements. And the scanning mirror reflects the detection light beam to different parts of the sample so as to carry out line scanning on the sample. Before the light beam reaches the reflector, the linear compression lens compresses the section length of the detection light beam, so that the reflector is miniaturized, and only the compressed light beam is reflected. When a linear beam of the probe beam is generated, a cascade of the collimating lens, the Powell lens, and the focusing lens generates a linear beam from an original beam of the point light source. The slit further filters the linear beam to remove its peripheral portion such that the intensity of the linear beam is substantially uniform even if an asymmetric divergent light source is used.

Description

[0001] List of abbreviations [0002] 2D: two-dimensional [0003] IR: infrared [0004] MEMS: microelectromechanical system [0005] MTF: Modulation Transfer Function [0006] OCT: Optical Coherence Tomography technical field [0007] The present invention relates to a device for imaging a sample by OCT using a line scan, and in particular to such a device realized using a small mirror for controlling the line scan of the sample while allowing to reduce the manufacturing cost of the device. Background technique [0008] OCT is an optical technique for cross-sectional imaging of a sample with micron-scale axial resolution. This technique has found application in non-invasive medical imaging, particularly in retinal imaging. When scanning a sample with OCT, raster scanning (point-by-point scanning) and line scanning can be used. Although OCT devices using line scan (hereinafter referred to as line scan OCT devices) are more complex to implement and thus more expensive, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/31G01N21/01
Inventor 弗拉季斯拉夫·尼基京冯萍萍袁嘉诚谢思凡李新亮
Owner HONG KONG APPLIED SCI & TECH RES INST
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