Double reentrant resonant cavity on-line measuring device for measuring grain moisture content

A measuring device and technology of moisture content, applied in resonators, using microwaves to test moisture content, waveguide devices, etc., can solve the problems of equivalent model defects, small number of samples, etc., achieve uniform field distribution, improve practicability, and facilitate fill effect

Active Publication Date: 2018-12-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

The resonant cavity of this method only detects the moisture content of a single grain, and the number of samples detected a

Method used

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  • Double reentrant resonant cavity on-line measuring device for measuring grain moisture content
  • Double reentrant resonant cavity on-line measuring device for measuring grain moisture content
  • Double reentrant resonant cavity on-line measuring device for measuring grain moisture content

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[0032] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below in conjunction with specific embodiments.

[0033] The measuring device is composed of two reentrant resonant cavities on the left and right, which are mutually coupled and connected, and the two resonant cavities are respectively a sample cavity and a test cavity, and the outer shell is metallic copper. A cylindrical sample barrel made of polytetrafluoroethylene is placed in the center of the sample cavity; a pair of coupling structures are symmetrically arranged on the outside of the test cavity on the right, and the coupling structure extends into the test cavity through a probe to realize the resonance cavity and Coupling between measuring instruments; left and right reentrant resonant cavities are interconnected by electric field coupling between interconnecting holes.

[0034] Specifically, the size parame...

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Abstract

The invention discloses a double reentrant resonant cavity on-line measuring device for measuring the grain moisture content, and belongs to the technical field of microwave application. The double reentrant resonant cavity on-line measuring device comprises a reentrant sample cavity and a reentrant testing cavity which are coupled mutually and are in butt joint. A sample barrel is arranged in thecenter of the sample cavity, and two coupling structures are symmetrically arranged on the outer side of the testing cavity. The coupling structures stretch into the testing cavity through probes, and thus the testing cavity and a measuring instrument are coupled. According to the double reentrant resonant cavity on-line measuring device, the testing efficiency and the testing precision can be improved, the influences of the sample stacking density on the testing result can be eliminated, and the practicability of the measuring device is improved.

Description

technical field [0001] The invention belongs to the field of microwave application technology, and in particular relates to a high-precision grain moisture content detection device based on complex dielectric constant testing, which is composed of a high-Q value double-entry resonant cavity. Background technique [0002] Grain moisture content is one of the important indicators of grain quality evaluation, and its detection is of great significance to grain storage, purchase, transportation, processing and other links. Excessive moisture content of grain can easily lead to germination and mildew of grain, which is not conducive to its storage and transportation. The low moisture content of grain will affect its nutritional value and reduce the germination rate of seeds. Therefore, the detection of high-precision grain moisture content plays a vital role in improving grain quality and economic benefits. [0003] The detection of grain moisture content usually adopts the ove...

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Application Information

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IPC IPC(8): G01N22/04H01P7/06
CPCG01N22/04H01P7/06
Inventor 胡标孙振海汪海洋周翼鸿李天明李浩
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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