Laser light source speckle measurement method, speckle suppression device and its parameter optimization method

A technology of laser light source and measurement method, which is applied in the direction of fluorescence/phosphorescence, material excitation analysis, etc., and can solve the problems of large deviation and inability to meet the needs of the evaluation of the speckle suppression effect of the light source of the gene sequencer

Active Publication Date: 2021-07-06
GEOPTICS SEQUENCING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Existing laser speckle suppression and speckle contrast measurement technologies and devices are aimed at laser display systems, and are limited by factors such as different optical systems, display surface characteristics, camera lenses, camera positions, exposure time, etc., and the test results are mainly Assess the impact of speckle on the image observed by human eyes. The measurement result deviates greatly from the actual situation, which obviously cannot meet the needs of the evaluation of the speckle suppression effect of the light source of the gene sequencer.

Method used

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  • Laser light source speckle measurement method, speckle suppression device and its parameter optimization method
  • Laser light source speckle measurement method, speckle suppression device and its parameter optimization method
  • Laser light source speckle measurement method, speckle suppression device and its parameter optimization method

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Embodiment 1

[0040] This embodiment provides a laser light source speckle measurement method. The measurement method is used to directly test the speckle contrast of the laser light source, and the test result can be used as a basis for adjusting the speckle contrast of the laser light source. This measurement method can be used to measure the speckle contrast of a laser light source on a gene sequencer or other optical equipment, and this embodiment uses a gene sequencer as an example for illustration.

[0041] Such as figure 1 As shown, the measurement device used in the laser light source speckle measurement method includes a laser generator 1 and a fluorescence imaging camera 2, the fluorescence imaging camera 2 is installed on the optical path of the laser light emitted by the laser generator 1, and the fluorescence imaging camera 2 directly receives the laser light generated The laser emitted by device 1.

[0042] The fluorescence imaging camera 2 in this embodiment is the same as t...

Embodiment 2

[0061] This embodiment provides a speckle suppression device, and the speckle suppression device is mainly used to optimize speckle suppression parameters.

[0062] Such as figure 2 As shown, the speckle suppression device of this embodiment mainly includes a laser generator 1 , a fluorescence imaging camera 2 and a vibration motor 4 .

[0063] The laser generator 1 includes a laser 11 and an optical fiber 12. The laser 11 has several arranged side by side. Each laser 11 is connected to an optical fiber 12. Several optical fibers 12 are bundled and wound together to form a multimode optical fiber. The middle part of the multimode optical fiber The position is wound several times.

[0064] The vibration output end of the vibration motor 4 is connected to the position where the multimode optical fiber is wound several turns, and the vibration motor 4 is used to drive the multimode optical fiber to vibrate to adjust the speckle contrast of the emitted laser.

[0065] The fluor...

Embodiment 3

[0068] This embodiment provides a speckle suppression parameter optimization method. This speckle suppression parameter optimization method is based on the laser light source speckle measurement method in the first embodiment and the speckle suppression device in the second embodiment. The laser light source The laser speckle contrast obtained by the speckle measurement method is used as the basis for optimizing speckle suppression parameters.

[0069] When the above laser light source speckle measurement method is used in a gene sequencer, the definition of illumination uniformity is the same as that of speckle contrast, which is the standard deviation of light intensity divided by the mean value of light intensity. Based on this premise, assuming that the illumination uniformity is required to reach 10%, it can be decomposed into the non-uniformity caused by the illumination optical system and the non-uniformity caused by speckle. The synthesis error of the former is 10%, so...

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Abstract

The invention discloses a laser light source speckle measurement method, a speckle suppression device and a parameter optimization method thereof. The laser light source speckle measurement method comprises the following steps: laser light emitted by a laser generator is irradiated onto a fluorescence imaging camera; the fluorescence imaging camera Receive laser light within the preset exposure time and generate corresponding image information; collect image information and form a Gaussian distribution image containing speckle, where the speckle appears as high-frequency noise; calculate the speckle after processing the Gaussian distribution image contrast. Since the fluorescence imaging camera in the laser light source speckle measurement method is directly used as the receiving screen of the laser speckle, the influence of the projection screen, the observation angle and position of the camera relative to the screen and other factors are eliminated on the basis of ensuring the consistency of the test, so this measurement method It can truly and reliably measure the speckle contrast of the laser light source, and has high measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of laser imaging, in particular to a laser light source speckle measurement method, a speckle suppression device and a parameter optimization method thereof. Background technique [0002] Gene sequencing refers to the analysis of the base sequence of a specific DNA fragment, that is, the arrangement of adenine (A), thymine (T), cytosine (C) and guanine (G). At present, the method of fluorescent labeling is generally used for gene sequencing. The gene sequencer uses an optical system containing a microscope objective to excite and collect the fluorescent signals emitted by the fluorescent markers on the gene sequencing chip. High-throughput gene sequencing imaging systems usually use lasers to excite fluorescent marker areas within the field of view of the objective lens on the sequencing chip, and the excited fluorescent energy is collected by a large-target camera. The laser light source of a gene sequence...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 常松涛杨旺李旭宫晨
Owner GEOPTICS SEQUENCING EQUIP CO LTD
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