Capacitance-process soil water measurement instrument with ultra-high measurement precision based on phase-locked loop technology

A technology for measuring accuracy and soil moisture. It is used in measuring devices, material capacitance, and material analysis by electromagnetic means. It can solve the problems of low measurement accuracy, radiation, stability and poor repeatability of measurement results, and achieve improved resolution. High efficiency, high resolution, high consistency and reproducibility

Pending Publication Date: 2017-12-22
徐州市伟思水务科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are several measurement methods for soil moisture today, including the following: 1. Frequency domain reflection method, 2. Time domain reflection method, 3. Neutron method, 4. Negative pressure method, 5. Resistance method, 6. Capacitance method; In addition to the frequency domain reflection method and the capacitance method, other methods have more or less shortcomings such as the need for intervention, low measurement accuracy, poor stability and repeatability of measurement results, while the neutron method has high measurement accuracy, but there are radiation problems. shortcoming

Method used

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  • Capacitance-process soil water measurement instrument with ultra-high measurement precision based on phase-locked loop technology
  • Capacitance-process soil water measurement instrument with ultra-high measurement precision based on phase-locked loop technology
  • Capacitance-process soil water measurement instrument with ultra-high measurement precision based on phase-locked loop technology

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: this moisture meter comprises: single-chip microcomputer MCU, AD converter, phase-locked loop circuit PLL, voltage-controlled oscillator VCO, varactor diode and fitting capacitance;

[0021] The output terminal of the single-chip MCU is connected with the input terminal of the phase-locked loop circuit PLL, and the phase-locked voltage PD of the phase-locked loop circuit PLL is simultaneously connected with the input terminal of the voltage-controlled oscillator VCO, the negative pole of the varactor diode, the switch K1 and the AD converter. The input end is connected, the output end of the AD converter is connected with the input end of the single-chip MCU; the anode of the varactor diode is grounded; the other end of the switch K1 is grounded through a fitting capacitor.

[0022] The single-chip MCU includes a keyboard, a display and surrounding components, the keyboard is connected to the input end of the single-chip MCU, and the display is connected to...

Embodiment 2

[0032] Embodiment 2: The anode of the varactor diode is connected to the calibration capacitor and grounded at the same time; the other end of the calibration capacitor is connected to one end of the switch K2, and the other end of the switch K2 is connected to the cathode of the varactor diode.

[0033] Relative measurement method:

[0034] figure 2 In the relative measurement method, there are two measurement values, 1. The most basic basic value, such as figure 2 varactor diode, when the external calibration circuit C 校 After the fitting capacitor Cx is disconnected through the switch as shown in the figure, the AD value of the voltage measured on the negative terminal of the varactor diode is the current real-time basic measurement value. 2. The so-called another measured value is when the calibration capacitance C 校 Or after the fitting capacitor Cx is respectively closed through switch 1 or switch 2, then measure the negative terminal of the varactor diode at this t...

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Abstract

The invention relates to a capacitance-process soil water measurement instrument with ultra-high measurement precision based on a phase-locked loop technology, and belongs to a capacitance-process soil water measurement instrument. An output end of a singlechip MCU of the water measurement instrument is connected with an input end of a phase-locked loop circuit PLL; phase-locked voltage PD of the phase-locked loop circuit PLL is simultaneously connected with an input end of a voltage-controlled oscillator VCO, a negative pole of a variable capacitance diode, a switch K1, a switch K2 and an input end of an AD converter; an output end of the AD converter is connected with an input end of the singlechip MCU; a positive pole of the variable capacitance diode is connected with a calibration capacitor and is grounded simultaneously; the other end of the calibration capacitor is connected with the other end of the switch K2; and the other end of the switch K1 is grounded by a fitting capacitor. The capacitance-process soil water measurement instrument with ultra-high measurement precision based on the phase-locked loop technology has the advantages that water of soil or other similar application is measured in a non-invasive, single sensing or stereoscopic multi-layered sensing mode, ultra-high stability of measurement is realized, the resolution ratio, reliability and precision of measurement are greatly improved, and the shortcomings that an existing measuring method is poor in measuring precision and center lines drift severely are overcome fundamentally.

Description

technical field [0001] The invention relates to a capacitance-method soil moisture measuring instrument, in particular to a capacitance-method soil moisture measuring instrument with ultra-high measurement precision based on phase-locked loop technology. Background technique [0002] Moisture is an important part of soil. It not only affects the physical properties of soil, but also is an important factor of soil fertility. It is also the basic condition for the survival of all crops. The understanding and research and development of soil moisture are important in theory and production. Its significance, and its application fields such as: 1. For agricultural activities such as tillage, irrigation and fertilization, this soil moisture meter can be used to measure the water content in the soil in advance, so as to achieve real-time online, intelligent irrigation according to water demand, and maximize Save water for agricultural irrigation. 2. When carrying out some engineer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/223
Inventor 张永立贺新民叶志刚崔家宽陈光祖杨浩
Owner 徐州市伟思水务科技有限公司
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