Multi-directional measuring apparatus and method for thermal conductivity of soil

Abstract

The invention relates to a multi-directional measuring apparatus and method for the thermal conductivity of soil, belonging to the technical field of soil physics. The multi-directional measuring apparatus comprises temperature sensor probes, a probe seat, a heat pulse probe, internal thread mouths, I-shaped bosses, I-shaped chutes, thermocouples, a heat pulse generator, a hand-held controller and a base plate. According to the depth of soil, the temperature sensor probes with different lengths and the heat pulse probe are selected, rotationally combined with the internal thread (mouths) in the center of the probe seat via threaded probe-fixing rods and an outer threaded rod for the probe respectively, and connected with the hand-held controller via leads. The measuring method comprises the following steps: equipment combination; reading of configurations; setting of parameters; data acquisition; and calculation of thermal conductivity. The multi-directional measuring apparatus and method can directly read the thermal conductivity of soil on site and reduce disturbance of to-be-detected soil, so unfavorable influence to measurement results caused by changes of a sampling environment is avoided, and the measurement precision of the thermal conductivity of the to-be-detected soil is substantially improved.

Description

technical field [0001] The invention relates to a multi-directional soil thermal conductivity measuring device and method, belonging to the technical field of soil physics. Background technique [0002] Thermal conductivity, also known as "thermal conductivity", reflects the thermal conductivity of materials and is an important physical indicator of thermal characteristics. After the soil absorbs a certain amount of heat, part of it is used to heat itself, and part of it is conducted to its adjacent soil layer. The soil has the ability to transfer the absorbed heat to the adjacent soil layer, which is called thermal conductivity. Its size is expressed by thermal conductivity λ, which represents a soil layer with a thickness of 1 cm. When the temperature difference is 1 °C, the cross-section is 1 cm per second. 2 The number of joules of heat passed, unit: J / CM·S·℃; [0003] At present, soil thermal conductivity measurement methods are divided into steady-state method and un...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the present invention provides a multi-directional soil thermal conductivity measurement device and method, which is used to solve the problem of existing probe thermal conductivity probes with fixed length and spacing when facing random materials with complex conditions. The limitations caused by the research, as well as the low accuracy and large error when measuring the thermal conductivity of different orientations and depths, and the inconvenient detection of multiple indicators;

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