Deep soil thermal parameter monitoring sensor and detection method

Abstract

The invention relates to a deep soil thermal parameter monitoring sensor and a detection method. The deep soil thermal parameter monitoring sensor mainly comprises a DC voltage-stabilizing voltage source, an insulated heating wire, a spherical probe, a temperature measurement module, a monitoring device, a balancing resistor, and a data collection unit. The DC voltage-stabilizing voltage source is used for supplying power to a heating circuit. The insulated heating wire is used for heating the probe. The probe is in the form of a hollow spherical shell made of copper-zinc alloy, and is embedded into the soil to measure the thermal parameters of the soil based on the heat transfer condition of the surrounding soil. The temperature measurement module comprises a thermal resistor as a temperature sensor and the thermal resistor is arranged on the inner surface of the spherical shell of the probe. The thermal resistor is used for measuring the temperature change on the surface of the probe. The monitoring device is composed of a resistance voltage divider and a sampling resistor and is used for monitoring the voltage and the current at the two ends of the insulated heating wire. The balancing resistor is used for stabilizing the output voltage and the temperature change before the measurement. The data collection unit is used for collecting the temperature on the surface of the probe, the voltage and the current at the two ends of the insulated heating wire. The deep soil thermal parameter monitoring sensor is convenient in measurement, rapid and portable. The deep soil thermal parameter monitoring sensor can be directly buried deep underground to monitor the thermal parameters of the soil surrounding a cable in real time.

Description

【Technical field】 [0001] The invention relates to soil thermal parameter measurement technology and its application field, in particular to a portable sensor for real-time monitoring of deep soil thermal parameters around cables. 【Background technique】 [0002] In recent years, the thermal probe method has become more and more widely used in measuring soil thermal parameters. The thermal probe method can calculate the temperature of the measured soil by measuring the temperature change curve of the probe buried in the soil and the corresponding mathematical model. thermal parameters. [0003] However, there are still technical problems to be solved urgently in the actual use of the above measurement methods: [0004] (1) In the traditional thermal probe measurement, the established thermal probe model is based on the idealized assumption that its length is much larger than the probe diameter, which is often not satisfied in practice; [0005] (2) The surface of the thermal...

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Problems solved by technology

[0004] (1) In the traditional thermal probe measurement, the established thermal probe model is based on the idealized assumption that its length is much larger than the probe diameter, which is often not satisfied in practice;

[0005] (2) The surface of the thermal probe cannot be guaranteed to be an ideal isothermal surface, which affects the accuracy of the measurement;

[0006] (3) During the measurement process, th

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