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Multi-frequency electromagnetic measurement method for density and moisture content of grain

A measurement method, electromagnetic wave technology, applied in the direction of measuring devices, specific gravity measurement, analysis of materials, etc.

Active Publication Date: 2013-05-01
REMOTE SENSING APPLIED INST CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages and disadvantages, and no method can measure the density and moisture of grain at the same time

Method used

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  • Multi-frequency electromagnetic measurement method for density and moisture content of grain
  • Multi-frequency electromagnetic measurement method for density and moisture content of grain
  • Multi-frequency electromagnetic measurement method for density and moisture content of grain

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Embodiment Construction

[0026] Specific implementation examples

[0027] The specific method of the present invention is as follows: take a grain sample of a certain weight from the grain pile, put it into a container of a certain volume, change the density of the grain by vibrating the container, change the moisture of the grain by drying or humidifying, and use an impedance analyzer, Moisture measuring instruments and thermometers measure the relationship between dielectric constant and frequency under different densities, moisture, and temperatures.

[0028] Multivariate statistical regression is performed on the measured data to determine the parameters a, b, c, and d of the relational model formula (1).

[0029] ϵ r ′ = [ 1 + ( a - b log 10 ...

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Abstract

The invention discloses a method of simultaneously measuring density and moisture content of grain based on a multi-frequency electromagnetic measurement technology. The method comprises the following steps of: firstly, measuring dielectric constants of a grain sample at different densities, moisture contents, temperatures and frequencies by a capacitance method, and establishing a relational model between the dielectric constants and the density and the moisture content; correcting model parameters according to the dielectric constant measured by an electromagnetic wave velocity method and the moisture content measured by an oven drying method, and establishing a parameter database of various grain varieties; and finally, substituting the electric constants of the grain in a grain bulk measured by the electromagnetic wave velocity method at two frequencies into the model, and solving the density and the moisture content of the measured grain. According to the measurement method provided by the invention, efficiency of detecting amount and quality of the grain can be improved, investment of labor power, material resources and financial capacity can be reduced and grain security can be ensured.

Description

technical field [0001] The invention relates to a method for measuring grain density and moisture in a grain depot, in particular to a method for using the characteristic that the dielectric constant is affected by grain density and moisture, inserting a small broadband short-wave antenna in parallel into the grain pile, and transmitting and receiving multiple frequency A method for measuring grain density and moisture using electromagnetic waves. Background technique [0002] Grain density is an important data for calculating grain weight. The current density measurement method is a sampling measurement analogy estimation method: take samples to measure the grain density, such as a volumetric container or a large container of 0.25 to 1 cubic meter, carefully fill the grain to weigh the net weight, and then divide it by the volume of the container to obtain the sample density; The average density of the grain pile is calculated by multiplying the sample density by the corre...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/24G01N9/36
Inventor 吴炳方吴方明杨雷东
Owner REMOTE SENSING APPLIED INST CHINESE ACAD OF SCI