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Mini type parallel three needle transmission line impedance method soil water content detector

A soil moisture and transmission line technology, used in soil material testing, material impedance, material inspection products, etc., can solve the problems of easy breakage of probes, high power consumption, and high price, so as to improve detection accuracy, reduce technical requirements, and reduce energy consumption. Low battery effect

Inactive Publication Date: 2004-07-21
江苏瑞迪生科技有限公司
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Problems solved by technology

[0003] The time domain reflectometer has high measurement accuracy and the technology used is very advanced, but the ultra-high frequency makes the length of the transmission cable limited by the on-site measurement plane space and depth space, and consumes more power during use. The overall equipment price Expensive; the frequency domain reflectometer with four-probe structure is difficult to insert into the soil, and the probes are easy to break when it is used in various soils, especially clay soils, when the moisture is relatively low and dry.

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  • Mini type parallel three needle transmission line impedance method soil water content detector
  • Mini type parallel three needle transmission line impedance method soil water content detector
  • Mini type parallel three needle transmission line impedance method soil water content detector

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Embodiment Construction

[0013] Such as figure 1 , figure 2 , image 3 As shown, the signal source 1 passes through the matching resistor 2 and the transmission line 3 to the detector. The detector is composed of a coaxial transmission line matcher 4 and three probes 5. One of the three probes 5 is connected to the coaxial transmission line matcher. The center end of 4 is the signal source, and the other two probes 5 are connected to the outer end of the coaxial transmission line matcher 4, which is the ground wire. The three probes 5 are inserted into the soil to be measured in parallel arrangement; the signal source 1 is generated by a quartz crystal oscillator The voltage signal with stable frequency and amplitude is sent to the detector, and the detector returns an electrical signal as an impedance, and passes through the transmission line 3 to the input terminal of the signal processing circuit 6, and is shaped and amplified by the operational amplifier to obtain the corresponding relationship ...

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Abstract

A detector applies three probes arranged in parallel, coaxial transmission line with quarter wavelength and signal processing circuit set with phase compensation circuit for carrying out phase difference compensation to measure and determinate dielectric constant of soil moisture in order to obtain moisture content in soil. The detection accuracy can be up to 1% volume moisture content, probe can be buried use and can support continuous data acquisition.

Description

technical field [0001] The invention relates to a detection device for miniature soil moisture measurement. Background technique [0002] Before the present invention was made, there were many instruments, equipment and devices for measuring moisture in soil, such as time domain reflection, frequency domain reflection, voltage standing wave, transmission line impedance method, capacitance method, etc., and its working principle is all based on soil and measured medium The dielectric constant was measured. Since the dielectric constants of air, dry soil and water are 1, 4 and 81 respectively, the difference is obvious, so that the determination of moisture in soil has a reliable theoretical basis. There is a good correspondence, so the determination of the water content of soil and other media can be achieved. The measurement of soil moisture content is widely used in the monitoring of dam leakage, piping, road subgrade construction, etc., and is also widely used in the mon...

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Application Information

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IPC IPC(8): G01N27/02G01N33/24
Inventor 高国治
Owner 江苏瑞迪生科技有限公司