Humidity sensor

Abstract

The invention relates to a humidity sensor which comprises a circuit board, a humidity sensitive element, an inner layer encapsulating compound, inner layer filter paper, an outer layer encapsulating compound, a metal casing and outer layer filter paper; the humidity sensitive element is arranged on the circuit board; the inner layer encapsulating compound coats the circuit board and enables the humidity sensitive element to be exposed out of the inner layer encapsulating compound, and the inner layer filter paper is adhered to the humidity sensitive element; the outer layer encapsulating compound coats the inner layer encapsulating compound, and enables the humidity sensitive element to be exposed out of the outer layer encapsulating compound; the metal casing wraps the outer layer encapsulating compound, an opening is formed in the metal casing, the humidity sensitive element is positioned right below the opening, the outer layer filter paper is adhered to the opening part of the opening, and is positioned above the inner layer filter paper, and the humidity sensor can achieve the dustproof, waterproof and low temperature resisting effects through the structure.

Description

technical field [0001] The invention relates to a sensor, in particular to a humidity sensor. Background technique [0002] Traditional humidity sensors are used in industrial and agricultural production, meteorology, environmental protection, national defense, scientific research, aerospace and other departments, often need to measure and control the environmental humidity. But among conventional environmental parameters, humidity is the most difficult parameter to measure accurately. [0003] The humidity sensor collects the moisture data in the air through the humidity sensor, feeds back to the central processor through the digital analog signal, and takes a series of measures such as dehumidification and humidification according to the humidity of the detected environment to make the environment reach an ideal state. [0004] The current general design is: in order to accurately detect the humidity in the air, when detecting the ambient humidity, the humidity sensor sho...

AI Technical Summary

Problems solved by technology

[0004] The current general design is: in order to accurately detect the humidity in the air, when detecting the ambient humidity, the humidity sensor should be exposed to the environment to be tested for a long time, because the linearity and pollution resistance of the humidity sensor are poor, and it is easy to be polluted. Affect its measurement accuracy and long-term stability, coupled with low temperature, water vapor freezing and other factors, the traditional humidity sensor is extremely easy to damage

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