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Sensor suitable for measuring soil dielectric properties in frequency domain frequency stepping system and production method thereof

A technology of frequency stepping and dielectric characteristics, applied in the field of sensors, can solve the problems that are not fully applicable to the field of soil detection, and achieve the effects of reducing signal attenuation, avoiding volume increase, and high measurement accuracy

Pending Publication Date: 2018-09-21
TIANJIN TELI PUER TECH
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  • Claims
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Problems solved by technology

[0020] Existing TDR instruments and other soil measuring instruments use many types of sensors, but none of them are fully suitable for the field of soil detection in the frequency domain frequency stepping system; therefore, the research and development of various sensors supporting it is to develop its application functions premise and guarantee

Method used

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  • Sensor suitable for measuring soil dielectric properties in frequency domain frequency stepping system and production method thereof
  • Sensor suitable for measuring soil dielectric properties in frequency domain frequency stepping system and production method thereof
  • Sensor suitable for measuring soil dielectric properties in frequency domain frequency stepping system and production method thereof

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Embodiment

[0073] Figure 10 When measuring 33.74% tidal soil with a three-pin probe with an input impedance of 50Ω, because the measured impedance is close to the input impedance, the reflection coefficient is too low to cause other signal noise interference (the first peak on the left is caused by the BNC connector of the coaxial cable reflection), causing multiple peaks to appear, which affects the accuracy of the measurement.

[0074] Figure 11 When the input impedance is adjusted to 20Ω, the screenshot of the same soil sample is measured. It can be seen that the measurement result is accurate, but the signal attenuation is too large.

[0075] Figure 12a with Figure 12b It is a real-time screenshot of the actual measurement of impedance converters with different lengths for fluvo-aquic soil with a volume moisture content of 10.87% (manual drying method). Figure 12a The length of the impedance converter is 3.5cm, Figure 12b The length of the impedance converter is 12cm.

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Abstract

The invention discloses a sensor suitable for measuring soil dielectric properties in a frequency domain frequency stepping system and a production method thereof. According to the method, a central needle of a probe body is connected with a coaxial cable inner conductor copper core through an impedance converter composed of a macromolecule low-conductivity material and a variable-diameter outer conductor, and other needle bodies are parallel to the central needle body and evenly distributed on the circumference of a circumscribed circle of which the circle center is the center needle body andthe diameter is S. The sensor suitable for measuring the soil dielectric properties in the frequency domain frequency stepping system and the production method thereof have the advantages that by adjusting the outer diameter and length of the impedance converter, a characteristic impedance of the impedance converter is optimally matched with an input impedance of a measuring instrument, so that blind spots are prevented from occurring in a normal region, the signal attenuation is reduced, and requirements under different conditions are satisfied; in addition, according to different measurement and precision requirements, an appropriate impedance converter length is determined, thereby overcoming the defect that adjacent too close reflections are distinguished difficulty, and ensuring higher measurement accuracy; on the other hand, the defect of volume increase of the sensor caused by excessive lengthening of the impedance converter is also avoided.

Description

technical field [0001] The invention relates to a sensor; in particular, it relates to a sensor suitable for measuring soil dielectric properties in a frequency domain frequency step system and a manufacturing method thereof. Background technique [0002] Time Domain Reflectometry (TDR), as a conventional instrument method for effective in-situ measurement, has been measuring the dielectric properties of soil such as dielectric constant, electrical conductivity, and impedance in recent years, and thus determines the volumetric moisture content, salt content, Soil properties such as compactness have been widely used. Its technical core - to measure the propagation speed of electromagnetic waves in soil, there are usually two ways: time-domain non-carrier frequency pulse system and frequency-domain frequency step system. [0003] The principle of time domain reflectometry (Time Domain Reflectometry, TDR) was produced in the 1930s, and was originally used to detect and locate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/221
Inventor 陆明傅增水杨世欣王晨光刘惠斌卢玉邓智博
Owner TIANJIN TELI PUER TECH
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