Microplastic detection device and method based on ratio of three-dimensional contour chain code to bright spot perimeter

A three-dimensional profile and detection device technology, applied in the direction of measuring devices, optical devices, chemical instruments and methods, etc., can solve the problem of underestimating the abundance of microplastics

Active Publication Date: 2019-11-22
DALIAN MARITIME UNIVERSITY
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  • Application Information

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Problems solved by technology

Raman spectroscopy can compensate for this deficiency but underestimate the abundance of microplastics in the sample

Method used

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  • Microplastic detection device and method based on ratio of three-dimensional contour chain code to bright spot perimeter
  • Microplastic detection device and method based on ratio of three-dimensional contour chain code to bright spot perimeter
  • Microplastic detection device and method based on ratio of three-dimensional contour chain code to bright spot perimeter

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Embodiment

[0046] When the device of the present invention is in use, the microplastic sample is first placed on the microfluidic chip 4, the microfluidic chip 4 is placed on the stage, and part of the coherent light emitted by the light emitting diode passes through the light hole component 2 and the light transmission component 3 The diffraction image formed on the sample placed on the stage is irradiated and collected by the image collection component 5 . The device selects a light emitting diode as the light source component 1, and the light emitted by the light emitting diode in the light source component 1 is partially coherent light, which can effectively suppress coherent speckle noise and interference. Partially coherent light emitted by the LED light source in the light source assembly 1 diverges into a beam of spherical waves after passing through the aperture in the aperture assembly 2, and the divergent spherical waves propagate to the sample surface through a suitable propag...

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Abstract

The invention provides a microplastic detection device and method based on a ratio of a three-dimensional contour chain code to a bright spot perimeter. The device includes a light source assembly, alight through hole assembly, a light propagation assembly, a microfluidic chip, an image acquisition assembly, and an image processing assembly that are connected successively. According to the method, a coaxial lensless digital holographic microscope system records a microplastic holographic image; numerical reconstruction is carried out on the holographic image to restore a three-dimensional real morphology in a microplastic sample; with the three-dimensional real morphology, a three-dimensional contour corresponding to the microplastic maximum diameter is obtained, a slope between adjacentpixels at the contour is calculated, and the slope is converted into a 8-chain code; and the microplastics is detected and distinguished by calculating a ratio of a slope chain code string sum to theperimeter of the bright spot at the center of the hologram. According to the invention, the microplastic detection device has characteristics of simple structure, high portability and simple operation. Problems of difficult detection of microplastics, complicated device structure, and inconvenient use in the prior art are solved.

Description

technical field [0001] The present invention relates to the technical field of detecting and distinguishing microplastics in the ocean, in particular, to a microplastic detection device and method based on the ratio of the three-dimensional contour chain code of the hologram to the perimeter of the central bright spot Background technique [0002] Microplastics generally refer to plastic particles or fragments with a diameter of less than 5 mm. There are many types and quantities of microplastics from daily life. Toothpaste with abrasive particles, facial cleanser, washing powder, massage shower gel, etc. all contain microplastics. The microfibers that flow out of the washing machine wastewater are also microplastics, and clothes made of synthetic fibers produce more microplastics. Microplastics enter the ocean through various channels, such as rice grain-sized plastic particle raw materials used in industry, plastic debris formed by physical action of large pieces of plast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01N21/27G01N21/01B01L3/00
CPCB01L3/5027G01B11/2441G01N21/01G01N21/27G01N2021/0112
Inventor 王俊生邹将
Owner DALIAN MARITIME UNIVERSITY
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