Dual-probe differential device for online measuring water content of microwave and measuring method

A moisture content, dual-probe technology, applied in the field of microwave applications, can solve problems such as the decrease of transmission attenuation resolution, the influence of microwave transmission transmission, dynamic measurement errors, etc., and achieve strong stability, continuous data acquisition and calculation output, and simple device structure Effect

Pending Publication Date: 2018-08-28
JILIN AGRICULTURAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the online measurement of moisture content by the microwave method is divided into two methods: transmission and reflection. The transmission method is limited by the energy transmission attenuation. When the thickness of the material to be measured on the production line is large or the moisture content is high, the resolution of the transmission attenuation decreases exponentially. At the same time, different materials of the conveyor belt will have a great impact on microwave transmission; the reflection method only needs to determine an interface of the material to be tested, and the measurement result is not affected by the thickness of the material and the material of the conveyor belt. The irregular distribution of surface particles seriously interferes with microwave scattering, resulting in large errors in dynamic measurement

Method used

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  • Dual-probe differential device for online measuring water content of microwave and measuring method
  • Dual-probe differential device for online measuring water content of microwave and measuring method
  • Dual-probe differential device for online measuring water content of microwave and measuring method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a dual-probe differential microwave online water content measurement device includes a servo motor unit 1, a screw guide unit 2, a sliding platform 3, a probe holder 4, a first double microwave probe 5, and a second double microwave probe 6 and a signal display control unit 9; wherein, the servo motor unit 1 is fixed on the top of the screw guide rail unit 2, and the motor signal line of the servo motor unit 1 is connected to the signal display control unit 9. When a control signal is input, The electric energy is converted into kinetic energy by the motor of the servo motor unit 1, and the ball screw of the traction screw guide unit 2 rotates; the sliding platform 3 is installed on the screw guide unit 2, and as the ball screw rotates, the sliding platform 3 can Move freely up and down along the linear guide rail; the probe holder 4 is installed and fixed on the sliding platform 3, and the first double microwave probe 5 and the second double ...

Embodiment 2

[0057] A method for measuring a device for measuring moisture content on-line with a dual-probe differential microwave, the specific steps are as follows:

[0058] S1. The measuring device is initialized and reset;

[0059] According to the actual transmission height of the material 7 under test, the device first initializes and resets, so that the horn antenna port of the microwave probe close to the material 7 under test is close to the surface of the material 7 under test;

[0060] S2. Determine the best measurement sensitivity position of the microwave probe;

[0061] The rotation of the servo motor unit 1 is controlled by the signal display control unit 9, so that the heights of the first double microwave probe 5 and the second double microwave probe 6 gradually rise, and the signal output of the microwave probe changes periodically, and the signal display control unit 9 compares the measurement data Collect and compare, when the output signal of the microwave probe clos...

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Abstract

The invention belongs to the technical field of microwave application, and specifically relates to a dual-probe differential device for online measuring the water content of microwave and a measuringmethod. The device consists of microwave probe units, a probe fixed seat, a sliding platform a lead screw guide rail unit, a servo motor unit and a signal display control unit. The dual-microwave probes are mounted on the probe fixed seat in the material conveying direction, the vertical height difference is 1/4 of microwave length, the dual-microwave probes are integrally fixed on the sliding platform in the lead screw guide rail unit, the servo motor is connected with the lead screw guide rail unit to control the movement of the sliding platform, the signal display control unit is used for controlling the servo motor to rotate so that the dual-microwave probes are positioned at the positions of phase position extreme points respectively; dual-probe data are collected through synchronousdelay for carrying out differential inversion operation processing so as to obtain water information of a measured material. According to the dual-probe differential device, the measurement accuracy is improved, and rapid non-damage detection for water content of materials such as cereals, gravels and chemicals on a conveyor belt can be realized.

Description

technical field [0001] The invention belongs to the field of microwave application technology, and in particular relates to a device and a measurement method for on-line measurement of moisture content by a dual-probe differential microwave. Background technique [0002] In grain storage and transportation, food processing, coal mining, fertilizer production and other industries, the moisture content of materials has a very important impact on product performance, quality and production efficiency. For example, in the process of food storage and transportation, too high moisture content will easily cause germination and mildew, and too low moisture content will destroy the internal structure, resulting in brittle particles and loss of nutrients; in the construction industry, the ratio of concrete sand and water distribution Among them, the moisture content directly affects the construction quality of buildings, bridges and other facilities. Therefore, at the moment when hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04
CPCG01N22/04
Inventor 李陈孝张涛宋乾韩冰
Owner JILIN AGRICULTURAL UNIV
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