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Method for measuring complex dielectric constant of weak-loss medium

A technology of complex dielectric constant and medium, which is applied in the field of measurement of complex dielectric constant of weak loss medium, can solve the problems that irregular medium samples cannot be measured, and the measurement uncertainty of low loss medium is large, so as to achieve easy operation and calculation simple effect

Inactive Publication Date: 2014-04-02
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the NRW transmission / reflection method also has the following problems: it has thickness resonance and multi-valued properties, requires extremely thin dielectric samples, cannot measure irregular dielectric samples, and has large uncertainties in the measurement of low-loss dielectrics.

Method used

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  • Method for measuring complex dielectric constant of weak-loss medium
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Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1 A method for measuring the complex permittivity of a weakly lossy medium. The steps and conditions are as follows:

[0029] (1) Such as figure 1 As shown, the measuring device used is composed of a network analyzer 1, a microwave narrowband antenna 2, a plastic foam board dielectric sample box 3, a wave absorbing material 4, a precision lifter 5, and a hydraulic lifter 6. The network analyzer 1 and the microwave narrowband antenna 2 Connection; the absorbing material 4 is placed on the precision elevator 5; the precision elevator 5 is placed on the hydraulic elevator 6, and the two form a height adjustment device; the precision elevator 5, model BS60-1, travel range ) Is 60mm, resolution (Resolution) is 0.01mm, and load (Load) is 20 Kg. Used for precise adjustment of the height of the medium sample platform to ensure the accuracy of phase measurement. Measuring frequency f 5.4GHz, under the condition of 0.01mm distance resolution, the phase measurement accurac...

Embodiment 2

[0046] Example 2 Select the medium sample 7 as a fresh water standard medium sample with a known dielectric constant; (3) Place the fresh water standard medium sample in the plastic foam board medium sample box 3; the rest are as in Example 1.

Embodiment 3

[0047] Example 3 The standard sample 7 is selected as a polytetrafluoroethylene standard medium sample with a known dielectric constant; the rest are as in Example 2.

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Abstract

The invention provides a method for measuring complex dielectric constant of a weak-loss medium. The complex dielectric constant of soil is a key parameter for associating soil attribute with microwave radiating capacity. The relationship between the soil attribute and the microwave radiating capacity can be built by accurately measuring the complex dielectric constant of the soil medium. According to the method provided by the invention, a transmission reflecting method and a free space wave method are combined; a measuring system is formed by a network analysis meter and a microwave narrow-band antenna; a semi-infinite space required by the free space method is simulated by a wave-absorbing material; the reflection coefficient of the surface of the measured medium is measured on the basis of metal plate calibration; the complex dielectric constant of the soil medium is calculated according to a double-layer plane medium transmission reflecting method principle. The complex dielectric constants of three standard mediums such as lunar soil, polytetrafluoroethylene and flesh water are simulated by the method provided by the invention, and the measuring result coincides with the theoretical model value. Compared with the existing method, the method provided by the invention has the advantages of easiness in operation and simplicity in calculation, and is an effective method for measuring the dielectric constant of the soil.

Description

Technical field [0001] The present invention involves a measuring method of a weak loss medium. Background technique [0002] Microwave remote sensing is interpreted, interpreted or reversed the nature and state of the surface target received from the scattering / radiation energy received by the remote sensor.In the study of quantitative remote sensing, no matter what kind of mathematical physical model is established for the remote sensing target, and what kind of calculation method is used, and what kind of calculation method is used, it is required to know the accurate dielectric characteristics of the remote sensing target, otherwise everything will not be performed.Therefore, in -depth research on the target compound dielectric constant is the basic work of a microwave remote sensing quantitative counter -discovery, and the key to how much information can be obtained from the microwave remote sensing data.The soil dielectric constant is one of the key parameters of the microw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 郑兴明赵凯姜涛张世轶孙建
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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