Anti-condensation, anti-dust and interference-free humidity sensor

Abstract

The invention relates to an anti-coagulation, dustproof and interference-free humidity sensor, which comprises a surface water offset optical path (1), a surface water offset optical path light source (2), a surface water offset optical path light source sealing cover (3), a monitoring optical path (4), a monitoring optical path light source (5), a monitoring optical path light source sealing cover (6), an in-optical-distance dust compensation optical path (7), an in-optical-distance dust compensation optical path light source (8), an in-optical-distance dust compensation optical path light source sealing cover (9), a sensor packaging shell (10) and a surface water offset optical path two-end fixing element (11). According to the anti-coagulation, dustproof and interference-free humidity sensor provide by the invention, a water film and dust interference on the surface of a probe and dust interference in the environment can be eliminated.

Description

technical field [0001] The invention relates to the technical field of humidity sensors, in particular to an anti-condensation, anti-dust and interference-free humidity sensor. Background technique [0002] Humidity sensors can be divided into: resistive, capacitive, frequency, etc. according to the electrical quantity output by the component; according to the material, it can be divided into: ceramic, organic polymer, semiconductor, electrolyte, etc.; according to whether it has affinity with water molecules Relevant is divided into: water affinity type humidity sensor and non-water affinity type. [0003] The characteristic that water molecules are easy to adsorb on the surface of objects and penetrate into the interior of solids is called water molecule affinity. After water molecules are attached to or immersed in moisture-sensitive functional materials, the electrical properties of functional materials will be changed through physical adsorption or chemical adsorption. ...

AI Technical Summary

Problems solved by technology

There are many types of humidity sensors, each with their own advantages and disadvantages, but there is a common problem: after a period of high humidity or after being wet by rain, the surface of the sensor probe will condense, and after the ambient humidity drops, the water film on the surface of the probe will not Dry, the data monitored by the sensor is still in a high humidity state, and there is a large error with the actual ambient humidity

[0006] At present, there are two problems with the humidity sensor. 1. In the high-humidity environment, the inside of the hygroscopic material or the surface of the non-hygroscopic material is adjusted in a saturated humidity environment. If there is moisture, if the humidity of the ambient air begins to decrease at this time, but because the moisture inside or on the surface of the probe cannot be dried immediately, there is a large lag, so the measured humidity will be obviously high; if the ambient humidity is relatively high at this time If it starts to rise quickly, the decrease and increase of the ambient humidity cannot be objectively reflected on the sensor.

2. The accumulation of dust on the surface of the sensor will cause the moisture absorption distortion of the humidity-sensitive probe, or cause the microwave, infrared, etc. to monitor the distortion through the absorption loss in the air

These two problems will lead to a large error of the humidity sensor under certain conditions, affecting the use effect

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