Cylindrical capacitance detecting device for detecting ocean microplastic

A capacitance detection, cylindrical technology, applied in the direction of capacitance measurement, measuring device, measuring electric variable, etc., can solve the problem of large error, achieve the effect of small detection device, accurate counting and measuring size, and simple production

Inactive Publication Date: 2019-09-20
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using common instruments to analyze visual inspection is one of the most basic methods, but its error is relatively large, and it is suitable for some large-sized microplastic particles

Method used

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  • Cylindrical capacitance detecting device for detecting ocean microplastic
  • Cylindrical capacitance detecting device for detecting ocean microplastic
  • Cylindrical capacitance detecting device for detecting ocean microplastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, a cylindrical capacitive detection device with a distance between two cylindrical capacitive plates set to 300 microns is used, and the excitation unit is connected to the cylindrical capacitive detection unit embedded in the microfluidic detection chip through an insulated wire. The detection microchannel in the microfluidic detection chip passes through the middle of the two cylindrical capacitance plates and is close to the microchannel. When detecting microplastic particles in seawater, the microplastic particles are first driven into the detection device through the sample inlet, flow through the cylindrical capacitor plate through the microchannel, and finally go from the microchannel to the sample outlet. The cylindrical capacitor plate and the LCR are precise The LCR precision meter provides the excitation voltage and frequency, and finally reads the data on the computer. At the same time, the capacitor plate is connected to the microscope to ...

Embodiment 2

[0049] The difference between this embodiment and Embodiment 1 is that in this embodiment, a cylindrical capacitive detection device with a distance between two cylindrical capacitive plates set to 200 microns is used, and the excitation unit is connected by an insulated wire and embedded in a microfluidic device. Detect the cylindrical capacitive detection unit in the chip. The detection microchannel in the microfluidic detection chip passes through the middle of the two cylindrical capacitance plates and is close to the microchannel. When detecting microplastic particles in seawater, the microplastic particles are first driven into the detection device through the sample inlet, flow through the cylindrical capacitor plate through the microchannel, and finally go from the microchannel to the sample outlet. The cylindrical capacitor plate and the LCR are precise The LCR precision meter provides the excitation voltage and frequency, and finally reads the data on the computer. A...

Embodiment 3

[0051] The difference between this embodiment and Embodiment 1 is that in this embodiment, a cylindrical capacitive detection device with a distance between two cylindrical capacitive plates set to 200 microns is used, and the excitation unit is connected by an insulated wire and embedded in a microfluidic device. Detect the cylindrical capacitive detection unit in the chip. The detection microchannel in the microfluidic detection chip passes through the middle of the two cylindrical capacitance plates and is close to the microchannel. When detecting microplastic particles in seawater, the microplastic particles are first driven into the detection device through the sample inlet, flow through the cylindrical capacitor plate through the microchannel, and finally go from the microchannel to the sample outlet. The cylindrical capacitor plate and the LCR are precise The LCR precision meter provides the excitation voltage and frequency, and finally reads the data on the computer. A...

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Abstract

The invention belongs to the technical field of ocean microparticle detection, and discloses a cylindrical capacitance detecting device for detecting ocean microplastic. The device comprises a microfluidic detecting chip, a cylindrical capacitance detecting unit embedded in the microfluidic detecting chip, and an exciting unit; the exciting unit is connected with the cylindrical capacitance detecting unit through an insulation lead; the cylindrical capacitance detecting unit comprises two cylindrical capacitance polar plates with the same structures; the two cylindrical capacitance polar plates are arranged in an aligned mode; and a microchannel in the microfluidic detecting chip penetrates between the two cylindrical capacitance polar plates, and is tightly bonded on the microchannel. The cylindrical capacitance polar plates are excited by high-frequency alternating current through the exciting unit; and when microplastic particles in seawater pass through the cylindrical capacitance polar plates, as the relative dielectric constant of the water is higher than the relative dielectric constant of the microplastic, negative capacitance signal pulse is generated, the sizes and the shapes of the microplastic are judged according to the amplitude magnitude and the frequency of the generated signal pulse, and the problems of low detecting speed, low detecting precision and complex detecting equipment in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of detecting microplastics in water, in particular, to a cylindrical capacitive detection device for detecting marine microplastics. Background technique [0002] Plastic is the main component of garbage in oceans, rivers and other waters, accounting for about 60% to 80% of the total garbage, and even 90% to 95% in some areas, and it is increasing every year. It is reported that the world produces more than 300 million tons of plastic every year, of which about 10% of the plastic will enter oceans, rivers, etc., but in fact, every piece of plastic we consume may end up in these waters. Microplastics refer to plastic fragments, fibers or particles with a particle size of less than 5 mm and greater than 0.1 μm. The problem of microplastic pollution in oceans and other waters has become a global hot issue. According to research, plastic pollution in the Mediterranean Sea is mainly caused by human activities s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C39/10B29C39/22G01R27/26
CPCB29C39/10B29C39/22G01R27/2605G01R27/2617
Inventor 张洪朋白晨朝纪玉龙陈海泉沈岩
Owner DALIAN MARITIME UNIVERSITY
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