Preparation and detection method of humidity sensor

Abstract

The invention relates to a preparation and detection method of a humidity sensor. The preparation method is characterized by comprising the following steps of adding a dispersing agent to water, performing ultrasonic dispersion to enable the dispersing agent to be uniformly dispersed in water, adding a carbon nano tube, and continuing to perform ultrasonic treatment to obtain a carbon nano tube aqueous solution, wherein the doping amount of the dispersing agent is the same as that of the carbon nano tube; adding cement to the carbon nano tube aqueous solution, uniformly stirring to obtain a mixture, putting the mixture into a die, perpendicularly inserting four stainless steel electrodes into the die at equal intervals, dismounting the die, and performing standard maintenance to obtain a humidity sensor element; and putting the humidity sensor element into a concrete shell, and isolating the humidity sensor element through a waterproof layer. The detection method of the humidity sensor comprises the following steps: drawing a standard resistivity-humidity curve according to a change relation between the resistivity of the humidity sensor and different humidities; and detecting the resistance of the humidity sensor, thus obtaining the humidity of the environment in which the humidity sensor is positioned, according to the standard curve. The humidity sensor is highly compatible with concrete, can monitor the humidity in the concrete in real time, and is high in sensitivity.

Description

technical field [0001] The invention relates to a humidity sensor and a preparation method thereof. The cement composite material doped with carbon nanotubes is used as a raw material. Background technique [0002] In mass concrete engineering, due to cement hydration or other factors, the humidity difference between the inside and outside of the concrete will cause deformation and cracking of the concrete, which will seriously affect the durability of the mass concrete. Therefore, the real-time monitoring of the humidity inside the mass concrete plays an important role in improving the durability. [0003] At present, the commonly used real-time monitoring technologies for the internal humidity of mass concrete include: piezoelectric strain sensing technology, optical fiber sensing technology, acoustic emission technology, etc. Among them, the piezoelectric strain sensing technology and optical fiber sensing technology generally embed the sensing element inside the materia...

AI Technical Summary

Problems solved by technology

Among them, the piezoelectric strain sensing technology and the optical fiber sensing technology generally embed the sensing element inside the material, which is likely to cause incompatibility between the sensing element and the material, which not only increases the difficulty of material structure design and manufacturing, but also improves the manufacturing efficiency. and maintenance costs, and has the limitation of only local monitoring; although the acoustic emission monitoring technology does not damage the material structure, it is expensive, easily affected by the outside world, and has high requirements for the test environment

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