Soil moisture measurement sensor and measurement method thereof

A technology for measuring sensors and soil moisture, which is applied in the direction of material capacitance, etc., can solve the problems of unguaranteed measurement accuracy, failure to provide calibration characteristics, untimely technical protection, etc., and achieve the effect of convenient debugging, low cost and low price

Active Publication Date: 2009-04-29
北京大恒软件技术有限公司
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Problems solved by technology

[0006] Due to China's vast territory and many types of soil, foreign soil moisture sensors cannot provide the calibration characteristics in various types of soil in China, and often the measurement accuracy cannot be guaranteed. In addition, the price is high, and technical protection is not timely, etc., so it is not suitable for widespread use in China. Promote application

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  • Soil moisture measurement sensor and measurement method thereof
  • Soil moisture measurement sensor and measurement method thereof
  • Soil moisture measurement sensor and measurement method thereof

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Embodiment Construction

[0019] The content of the present invention will be described in detail below in combination with specific embodiments.

[0020] Circuit principle block diagram of the present invention is as figure 1 As shown in , it includes a high-frequency signal source 1, a transmission line equivalent network circuit 2, two detection circuits 3, a differential amplifier circuit 4, and a sensor probe 5. Among them, the high-frequency signal source 1 generates a high-frequency sinusoidal signal of 100MHZ, and this signal is transmitted to the sensor probe 5 through the transmission line equivalent network circuit 2. The sensor probe 5 is composed of four stainless steel probes with a length of 60 mm and a diameter of 3 mm. One is the central probe, connected to one end of the transmission line equivalent network circuit 2, and the other three are peripheral probes arranged in an equilateral triangle, connected to the ground end of the transmission line equivalent network circuit 2, and the...

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Abstract

The invention relates to a sensor for measuring soil moisture and a measuring method thereof. The soil moisture sensor sends out high frequency signals through a high frequency signal source; a detection circuit converts change of a dielectric constant into direct current voltage to output; and the outputted direct current voltage and soil moisture content determine mathematical relation, so as to achieve accurate measure of water content of soil volume; and the measurement accuracy is +/- 2 percent. Because the detector head of the sensor adopts a probe type, the sensor can be embedded in a soil section to measure continuously and can also be matched with a special measuring instrument to measure in a movable circulation mode; as the circuit is relatively simple, the measuring method has low cost which is much lower than that of a TDR soil moisture tester; , and the measuring method is convenient to debug, and ensures consistency of batch production of sensors.

Description

technical field [0001] The invention relates to a soil moisture measuring sensor and a measuring method thereof. Background technique [0002] Soil moisture measurement technology is an important technical guarantee for water saving and drought relief. Soil moisture sensors and measuring instruments are important technical means to realize variable irrigation and moisture (drought) monitoring. [0003] Using the dielectric properties of soil to measure soil water content is an effective, fast, simple and reliable method. Chernyak, a scholar from the former Soviet Union, was the first to make a systematic study on the dielectric properties of soil. In 1964, he published the famous academic work "Research Method of Dielectric Properties of Wet Soil" that attracted worldwide attention. Based on this, the dielectric properties of soil are quickly applied to the measurement technology of soil moisture content, and the specific implementation methods vary widely. Among them, me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
Inventor 王一鸣
Owner 北京大恒软件技术有限公司
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