A microwave sensor for detecting dielectric constant of liquid

By designing a microwave sensor with a simple structure, using rectangular metal microstrip lines and annular and rectangular channels of PDMS flexible material layers, the existing liquid dielectric constant detection technology is solved, and fast and accurate liquid dielectric constant measurement and identification are achieved.

CN114675082BActive Publication Date: 2025-03-25HENAN NORMAL UNIV
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Patent Information

Application Number
CN202210186092.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-02-28
Publication Date
2025-03-25
Estimated Expiration
2042-02-28

AI Technical Summary

Technical Problem

The existing liquid dielectric constant detection technology is complex and costly, and traditional identification methods are not convenient to quickly identify the toxicity of colorless liquids.

Method used

A microwave sensor with simple structure is designed, including metal patches, upper and lower substrates, fluid channel layers and metal ground. The vector grid analyzer is connected to the SMA joint through a rectangular metal microstrip line, and the flow detection of liquid is achieved by etching the annular and rectangular channels through a PDMS flexible material layer.

Benefits of technology

It realizes rapid and accurate measurement of the dielectric constant of the liquid, and can identify and distinguish different liquids. It has the characteristics of small size, low manufacturing cost, high sensitivity and convenient detection process.

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Abstract

The present invention discloses a microwave sensor for detecting the dielectric constant of liquid, which comprises a metal patch, an upper substrate, a fluid channel layer, a lower substrate and a metal ground arranged in sequence from top to bottom, wherein the metal patch is formed by connecting a circular patch with a rectangular metal microstrip line arranged in the middle of the groove after radial slotting, the end of the rectangular metal microstrip line is welded with an SMA connector and the SMA connector is connected with a vector network analyzer to form a liquid detection system, the fluid channel layer is a PDMS flexible material layer and the fluid channel is etched in the PDMS flexible material layer, the fluid channel body is an annular channel, and rectangular channels connected to the annular channel are respectively provided on both sides of the annular channel, for realizing that the fluid to be measured flows into the annular channel from the rectangular channel on one side and flows out from the rectangular channel on the other side. The present invention has the function of being able to quickly and accurately measure the dielectric constant of liquid, and also has the function of identifying and distinguishing different liquids.
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