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Apparatus and analysis method for determination of moisture in materials

A device and technology of water content, applied in the direction of using microwave to test water content, etc., can solve the problems of phase distortion and low sensitivity

Inactive Publication Date: 2007-02-14
THERMO GAMMA METRICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of these spurious waves is to distort the phase measured by all types of transmission measurements
Another source of error can come from limitations in the receiver itself
For example, receivers become less sensitive at high attenuation, causing the measured phase to not be a true representation of the phase of the actually received wave

Method used

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  • Apparatus and analysis method for determination of moisture in materials
  • Apparatus and analysis method for determination of moisture in materials
  • Apparatus and analysis method for determination of moisture in materials

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Embodiment Construction

[0044]The preferred embodiment of the invention is a method employing a dual discrete frequency free space transmission device for making continuous measurements of the phase shift and attenuation at each frequency of electromagnetic waves propagating through a material under study. The present preferred embodiment develops the discovery of an analytical technique, hereafter referred to as method (I), which involves the use of two phases of measurement which provide excellent accuracy in moisture measurement. Specifically, a transformation involving the phases of the two measurements is used to calculate the correction value, thereby reducing the error effect of the spurious waves on the receiver and obtaining a more accurate absolute phase shift. Second, the preferred embodiment develops a compensation technique, hereinafter referred to as method (II), when calibrating the device to improve the accuracy of the measurements. By means of this method (II), distortions in the aux...

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Abstract

There is disclosed a method of estimating moisture content in a material involving directing a first frequency (f1) signal and a second frequency (f2) signal through a material, determining a first absolute phase shift (phi1), of said frequency signal and a second absolute phase shift (phi2) of said second frequency signal, transforming phi1 to a first corrected absolute phase shift (phi1c) and phi2 to a second corrected absolute phase shift (phi2c) in accordance with an expected relationship between phi1 and phi2, and estimating moisture content from phi1c and phi2c.

Description

technical field [0001] The present invention relates to a method and apparatus for determining the moisture content in a material. Background technique [0002] Moisture content is a critical production parameter in many production processes. A wide range of materials are studied for their moisture content, including food, chemicals, ores, concentrates, coal, oil, and gas. It has been recognized for some time that the use of the interaction of electromagnetic waves with the material under study can provide a means of determining moisture. Microwave-based methods rely on the observed high correlation between water content and one or more parameters in wave phase shift, reflection, or attenuation. This correlation exists in a considerable number of materials. Fundamentally, the correlation arises because free water exhibits much larger dielectric constant values ​​than water-entrained materials. The effective dielectric constant can be derived from the dielectric tensor, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N22/04
CPCG01N22/04
Inventor 戴维·G·米利亚克
Owner THERMO GAMMA METRICS