Double-probe heat-pulse thermal-property measure apparatus capable of realizing spacing in-field self correcting and method

Abstract

The invention belongs to the technical field of measure, and especially relates to a double-probe heat-pulse thermal-property measure apparatus capable of realizing spacing in-field self correcting and a method. The double-probe heat-pulse thermal-property measure device capable of realizing spacing in-field self correcting comprises a pedestal, and a temperature probe and a heating probe both fixedly disposed on the pedestal, and is characterized in that the length / internal diameter of the temperature probe and the heating probe is larger than 25, two temperature-measuring elements are arranged in the temperature probe along the axial direction of the temperature probe, and the two temperature-measuring elements and the heating probe are all connected with an external-connection device. By employing the two temperature-measuring elements, the provided measure apparatus and the measure method help to reduce the specific heat measurement error caused by bending deformation of the probes in practical application. Additionally, the apparatus is simple in structure, low in cost, convenient to use and rapid and accurate for measurement.

Description

technical field [0001] The invention belongs to the technical field of measurement, and mainly relates to a double-needle thermal pulse thermal characteristic measuring device and a measuring method capable of self-correcting the probe spacing of bending deformation on the spot. Background technique [0002] At present, the methods for measuring the thermal properties of materials such as soil, rock, food, and combustible ice are mainly single-needle thermal pulse method and double-needle thermal pulse method. The single-needle thermal pulse method can only measure the thermal conductivity of the substance, but cannot directly obtain the specific heat and thermal diffusivity of the substance to be measured. The double-needle thermal pulse method can measure thermal conductivity, thermal diffusivity and specific heat at the same time. At present, the double-needle thermal pulse method is mostly used in actual measurement and application. [0003] The measurement device of th...

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Problems solved by technology

[0010] However, in practical applications, especially in the field, due to stress effects such as expansion and contraction of the substance to be measured, alternating freeze-thaw cycles, and obstruction by other substances, it is easy to cause the probe inserted into the substance to be measured to bend, such as freezing and thawing. The soil is easy to swell and shrink in winter; there are stones, roots and other debris in the soil, which can easily cause the probe to bend and deform

After the probe is bent, the distance between the probes changes, which eventually leads to a large error in the measured thermal characteristics

Studies have shown that a 2% deviation in the probe spacing will result in a 4% error in the measurement of the specific heat of the substance to be analysed.

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