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Online monitoring system based on dielectric property dynamic change

A dielectric characteristic and monitoring system technology, applied in the direction of dielectric property measurement, measurement of electrical variables, measurement devices, etc., can solve problems such as expensive, complex operation, complex structure, etc., to achieve accurate data, wide application range, and trustworthy Effect

Inactive Publication Date: 2017-08-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the sensors used in these online monitoring technologies are complex in structure, complex in operation, and expensive.

Method used

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  • Online monitoring system based on dielectric property dynamic change
  • Online monitoring system based on dielectric property dynamic change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: Take Radix Astragali as an example to illustrate the specific operation steps:

[0044] (1) Use network analyzer coaxial cable equipment to measure the dielectric loss factor of Astragalus membranaceus under different moisture conditions (fixed frequency is 2450MHz) with temperature changes. Taking moisture content and temperature as independent variables and dielectric loss factor ε" as dependent variable, the software is used to carry out binary regression fitting on the test data, and the dielectric loss ε" and moisture content and temperature of Astragalus membranaceus at a frequency of 2450 MHz are obtained. Mathematical model for the main influencing factors:

[0045] ε' 2450 =29.32+0.2827w+0.1586t+0.0032w 2 -0.0008t 2 -0.0036wt

[0046] ε″ 2450 =20.4901-0.0053w+0.0459t-0.0021w 2 -0.000031t 2 +0.0004wt

[0047] (2) Input the mathematical relationship model between the dielectric loss factor of Radix Astragali and temperature and moisture re...

Embodiment 2

[0050] Embodiment 2: take the ginkgo fruit as an example to illustrate the specific operation steps:

[0051] (1) Use network analyzer coaxial cable equipment to measure the dielectric loss factor of ginkgo fruit under different water conditions, which varies with temperature (fixed frequency is 915MHz). Taking water content and temperature as independent variables, and dielectric loss factor ε" as dependent variable, the software is used to carry out binary regression fitting on the experimental data, and the dielectric loss ε" and water content, water content, and Mathematical model with temperature as the main influencing factor:

[0052] ε' 915 =41.5351+0.1023w+0.1012t+0.0042w 2 -0.0003t 2 -0.0039wt

[0053] ε″ 915 =22.3817+0.0829w+0.1478t-0.0023w 2 +0.0007t 2 -0.0014wt

[0054] (2) Input the mathematical relationship model between the dielectric loss factor of ginkgo fruit and temperature and moisture respectively in the industrial computer in advance.

[0055] (...

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Abstract

The invention relates to an online monitoring system based on dielectric property dynamic change. The dynamic change value of the material dielectric property is monitored in real time through advanced input of a mathematical model; the dielectric property dynamic change online detection is performed. According to the whole process, firstly, a dielectric constant of the materials at a certain frequency, a dielectric consumption factor and a mathematical relationship model of water and temperature distribution are input; a mathematical model base of the dielectric constant and dielectric consumption factor change along with the temperature and the water is built; the online monitoring on the dynamic change value of the dielectric characteristics in the processing process is realized through the online real-time monitoring of the water and the temperature.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring in the microwave treatment process. It relates to an on-line monitoring system based on the dynamic change of dielectric properties. The system can reflect the dynamic changes of various indexes of materials in real time through on-line monitoring, so as to reflect the degree of progress of the microwave treatment process. Background technique [0002] In recent years, there have been some researches on the monitoring of dielectric properties in the world, and domestic related researches have also increased year by year. For example, parallel plate electrode technology is widely used in the detection of physical and chemical indicators of agricultural raw materials, and it has been seen in many research reports due to its high precision, convenience, speed and non-destructive characteristics. The electrical parameters of food raw materials, such as impedance Z, equivalent capacitance C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22G01R27/26
CPCG01N27/221G01R27/2623G01R27/2694
Inventor 宋春芳姜雨婷马晓彤刘汇洋
Owner JIANGNAN UNIV
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