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Material moisture content measuring device based on microwave cavity physical wave and measuring method thereof

A measuring device and technology for moisture content, applied in the field of microwave applications, can solve the problems of unmeasured sample detection, space microwave reflection, transmission and scattering, large volume, etc., and achieve the effect of good portability and fast non-destructive measurement

Pending Publication Date: 2022-08-05
JILIN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the moisture content measurement devices based on microwave space technology are large in size and fixedly installed in the production line to continuously measure a large number of products. They cannot detect the samples to be tested anytime and anywhere, which limits their application scenarios.
At the same time, after the microwave interacts with the measured sample, the space microwave will produce reflection, transmission and scattering phenomena, and the multiple reflections of electromagnetic waves will reduce the measurement accuracy of water content

Method used

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  • Material moisture content measuring device based on microwave cavity physical wave and measuring method thereof
  • Material moisture content measuring device based on microwave cavity physical wave and measuring method thereof
  • Material moisture content measuring device based on microwave cavity physical wave and measuring method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] like figure 1 As shown, a material moisture content measurement device based on microwave cavity detection includes a sample to be tested 1, a front panel 2, a display output unit 14, a device casing 3, a temperature sensor 4 located inside the device casing 3, a horn antenna 5, Slotted waveguide 6, microwave resonant cavity 7, detection probe 8, coaxial line 9, microwave power detector 10, guide rail unit 11, sliding platform 12 and control unit 13; wherein, the front panel 2 is fixedly installed on the device casing A temperature sensor 4 is also provided on the front-end panel 2 inside the device casing 3; the horn antenna 5, the slotted waveguide 6 and the microwave resonant cavity 7 are connected end-to-end in sequence, and one end of the detection probe 8 Vertically fixed on the sliding platform 12, the sliding platform 12 is slidably connected to the guide rail unit 11, the guide rail unit 11 is composed of a sliding rail and a motor connection, the sliding platf...

Embodiment 2

[0075] This embodiment describes the specific structures of the slotted waveguide and the detection probe. like figure 2 As shown, a specific combined structure of the slotted waveguide 6 and the detection probe 8 has a narrow long slot in the middle of the lower surface of the waveguide cavity, the slot length L1 is 50mm, and the slot width is 1mm. The detection probe 8 penetrates deep into the slot to measure the microwave signal inside the slotted waveguide 6 . The detection probe 8 realizes the movement measurement inside the waveguide cavity through the movement of the sliding platform 12 . The distance between the detection probe 8 and the initial position of the left slot is D. When the voltage measured at a certain point is the minimum value of the traveling standing wave, the corresponding moving distance D is D. m .

Embodiment 3

[0077] In this example, wheat is used as the measurement object to illustrate the specific measurement method of the measuring device. The initial moisture content of the wheat after natural drying is 9%, and 6 wheat samples with different moisture contents are finally obtained by adding water to the samples and stirring continuously. , the moisture content varies from 9% to 28.4%.

[0078] A measurement method of a material moisture content measurement device based on microwave cavity detection, the specific steps are as follows:

[0079] S1, microwave space wave signal continuous measurement;

[0080] The control unit 13 controls the motor in the guide rail unit 11 to rotate, so that the detection probe 8 is gradually moved closer to the wheat. Acquisition, comparison by the control unit 13, recording the maximum voltage V max , the minimum value V min and the moving distance D of the detection probe 8 corresponding to the minimum value m , calculate the voltage standing...

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Abstract

The invention discloses a material moisture content measuring device based on microwave cavity physical waves and a measuring method thereof, and belongs to the technical field of microwave application. Comprising a front end panel, a device shell, a temperature sensor, a horn antenna, a slotted waveguide, a microwave resonant cavity, a detection probe, a coaxial line, a microwave power detector, a guide rail unit, a sliding platform, a control unit and a display output unit, the horn antenna, the slotted waveguide and the microwave resonant cavity are sequentially connected end to end, microwave detection on the interior of the cavity is achieved through movement of the detection probe located in the cavity of the slotted waveguide, and the temperature of a measured sample is measured through the temperature sensor installed on the edge of the front end panel. Establishing an inversion formula with temperature compensation to realize real-time measurement of the water content of the material; according to the invention, the portability and the measurement precision of the microwave moisture content measurement device are improved, so that the measurement result is not influenced by the material temperature and the accumulation condition, and rapid nondestructive measurement of materials such as grains, building materials, medicines, chemical products and the like can be realized.

Description

technical field [0001] The invention belongs to the technical field of microwave applications, and in particular relates to a material moisture content measurement device based on microwave cavity detection and a measurement method thereof. Background technique [0002] In the processing and manufacturing industries such as grain, paper, soil, fertilizer, textile and petroleum, the moisture content of raw materials has an important impact on the performance quality and production efficiency of products. The moisture content of materials can be measured directly or indirectly. Among them, the direct measurement method mainly adopts the wet-based method, and the moisture content is calculated by measuring the specific gravity of the difference between the weight of the sample before drying and after drying; the measurement speed of the wet-based method is faster. It is slow and needs to destroy the material, and is generally used for moisture calibration in the laboratory. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04
CPCG01N22/04
Inventor 李陈孝何贤赵晨宇任圆徐艳蕾
Owner JILIN AGRICULTURAL UNIV
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