Freezing temperature sensor and measuring method thereof

Abstract

The invention provides a freezing temperature sensor and a measuring method thereof. The invention is suitable for carrying out fixed-point measuring on the freezing temperature of different soil bodies under different pressure conditions. The freezing temperature sensor is mainly composed of an insulating terminal, a copper sheet, a copper lead wire, a heat-sensitive resistor, a heat-sensitive resistor lead-out wire, a reference resistor and a DC voltage source. The DC voltage source, the reference resistor and the copper sheet are connected in series by the copper lead wire. A freezing temperature sensor probe which is arranged at the position to be measured is connected with the copper lead wire and the heat-sensitive resistor lead-out wire by a data collector, and measures the differential pressure value and the temperature of a point to be measured in the soil body in real time. The freezing temperature sensor has the characteristics of simple structure, low cost, simple as well as convenient operation, accurate data, good stability and high reliability.

Description

technical field [0001] The invention relates to a freezing temperature sensor and a measuring method thereof, and is especially suitable for fixed-point measurement of the freezing temperature of different soil bodies under different pressure conditions with different soil properties and water contents. Background technique [0002] Mine shafts in deep topsoil layers are mainly constructed by artificial freezing method, which is used as a frozen wall for temporary support during the construction of the shaft, and its thickness is the main index for freezing method design and engineering safety. At present, the 0°C plane is still used as the criterion of the frozen wall interface. The actual engineering measurement found that the freezing temperature at the interface of the frozen wall is lower than 0°C, which leads to a decrease in the actual thickness of the frozen wall. In order to ensure the construction safety of the freezing method, it is necessary to correctly design ...

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Problems solved by technology

The advantage of this method is that the operation is simple and fast. The disadvantage is that the resistivity of the frozen soil reaches several million ohms. The resistivity measurement error of this order of magnitude is very large. It does not meet the requirements for measuring the freezing temperature; another method is to apply the supercooling principle to determine the freezing temperature

The advantage of this method is that the data is reliable, and the disadvantage is that the operation is complicated, and the supercooling phenomenon can only occur under the appropriate equipment structure size and parameters

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