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Construction method of microwave transmission model of wheat moisture based on comsol

A construction method, wheat technology, applied in the direction of using microwaves to test moisture content, etc., can solve the problems of low measurement accuracy, low signal strength, high and low density, and environmental temperature measurement results, and achieve the effect of improving accuracy

Active Publication Date: 2022-04-08
HENAN UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

Capacitance measurement has low cost and simple structure. The disadvantage is that it is greatly affected by the variety, temperature, and density of grain, and the measurement accuracy is low and the stability is poor.
The resistance method grain moisture measuring instrument is cheap and simple in structure; the disadvantage is that the sampling requirements are high, the signal strength is low, and the contact state between the sensor and the grain will affect the measurement accuracy. It is not suitable for the determination of micro-water content and high water content.
The near-infrared method is a non-contact measurement without pretreatment, fast measurement speed and wide application range; the disadvantage is that factors such as grain shape, density and ambient temperature will affect the measurement results
Compared with traditional detection methods, microwave detection methods are less sensitive to the environment, have strong penetrating ability, are non-invasive, have no damage to the detection objects, and can detect continuously and rapidly online; however, microwave detection methods have not been widely used in food Moisture content detection

Method used

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  • Construction method of microwave transmission model of wheat moisture based on comsol
  • Construction method of microwave transmission model of wheat moisture based on comsol
  • Construction method of microwave transmission model of wheat moisture based on comsol

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0036] The specific method of the present invention based on the COMSOL wheat moisture microwave transmission model construction method embodiment, the steps are as follows:

[0037]Step 1: Set the size of each module in the global definition of the COMSOL simulation software according to the structural parameters of the physical map, set the shape of each module in the component, and establish the 3D simulation model of the transmitting antenna, receiving antenna, air, wheat modules, and container; The axis type set for the simulation model is the z axis, and the working plane is the xy plane. Among them, the structural parameters of the 3D simulation model include the distance between the two antenna models and the container model, the length, width, and height of the container model, and the angular unit of the model. In this embodiment, the...

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Abstract

The invention relates to a method for constructing a COMSOL-based microwave transmission model of wheat moisture. The method includes establishing a 3D simulation model, adding material attributes, adding an electromagnetic wave source field, dividing the grid of the 3D simulation model, defining a frequency range, and calculating the 3D simulation model. And obtain the frequency-S parameter one-dimensional graph; Change the water content of wheat, observe the frequency-S parameter curve of moisture content after changing, record its change law; Form the law between the wheat water content and the frequency-S parameter curve; Measure the frequency-S parameter curve of the wheat to be measured, so as to determine the moisture content of the wheat to be measured; under the premise of not destroying the state of the wheat, the present invention uses a microwave detection method to explore the relationship between the moisture content of wheat and the frequency-S parameter curve of microwave The law can improve the accuracy of wheat moisture content measurement; at the same time, it can quickly build its moisture content database for different grain moisture content of different characteristic parameters, thereby promoting the formulation of grain moisture standards in the grain industry.

Description

technical field [0001] The invention relates to a method for constructing a microwave transmission model of wheat moisture based on COMSOL. Background technique [0002] Grain moisture content is an important quality index of grain storage safety, timely grasping of grain moisture content can prevent grain mildew caused by excessive moisture content. The traditional methods of grain moisture detection mainly include capacitance method, resistance method and near-infrared method. Capacitance measurement has low cost and simple structure. The disadvantage is that it is greatly affected by the variety, temperature, and density of grain, and the measurement accuracy is low and the stability is poor. The resistance method grain moisture measuring instrument is cheap and simple in structure; the disadvantage is that the sampling requirements are high, the signal strength is low, the contact state of the sensor and the grain will affect the measurement accuracy, and it is not suit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N22/04
CPCG01N22/04
Inventor 秦瑶刘硕王其富蔡成欣杨卫东肖乐段珊珊
Owner HENAN UNIVERSITY OF TECHNOLOGY
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