Abstract
We have demonstrated a highly sensitive moisture sensor that can detect water molecules, in addition to water droplets, and therefore, can predict dew condensation with high accuracy and high speed before the formation of water droplets, showing a better performance than a commercial hygrometer. Additionally, the dependence of the output response from the sensor on factors, such as the cooling rate of the sensor’s surface and the vapor pressure in the chamber, that affect the performance of the moisture sensor has been clarified. The output response showed a clear dependence on the variation in cooling rate, as well as the vapor pressure. The higher the cooling rate and vapor pressure, the higher the output response. The output response showed a linear response to the change in the above-mentioned parameters. The higher sensitivity and accuracy of the moisture sensor, as a function of the physical parameters, such as cooling rates, vapor pressure, enables the sensor to perform in advanced detection applications. The sensor can be modified to the actual target regarding the surface nature and the heat capacity of the target object, making it more suitable for wide applications.
Highlights
There are numerous applications where sensors are widely used, such as air conditioners and humidifiers, industrial process control, medical science, food production, agriculture, weather bureaus, meteorological, and marine monitoring [1,2,3,4,5,6,7,8,9,10,11,12]
We have studied the relationship between the output response from the sensor and factors, such as cooling rate of the sensor’s surface and vapor pressure in the chamber, that affect the performance of the moisture sensor, and clarified the effect of the cooling rate of sensor’s surface on the current response of the moisture sensor corresponding to the stacking of adsorbed water molecules
The water molecules presumably started to appear on the cooled sensor surface and formed thin films bridging the two dissimilar electrodes to generate a galvanic current [18]
Summary
There are numerous applications where sensors are widely used, such as air conditioners and humidifiers, industrial process control, medical science, food production, agriculture, weather bureaus, meteorological, and marine monitoring [1,2,3,4,5,6,7,8,9,10,11,12]. They require precisely controlled humidity levels and rely on accurate and fast humidity sensing. We measured the temperature and humidity precisely using a capacitive hygrometer
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