Design and Fabrication of an Inexpensive Capacitive Humidity Sensor for Smart Sub-Station Automation

Advancements in Trace and Low Humidity Sensors Technologies Using Nanomaterials: A Review

“…It is straightforward to incorporate poly(vinyl alcohol) (PVA) as a film because of its excellent adhesion to polyimide. A low humidity sensor was created by Biswal et al 36 It is generally advised to keep the water content level below 200 ppm (ppm) to reduce the effects of moisture on the characteristics of polymers. In order to measure the amount of moisture in polymers, Dos Santos et al 119 created a capacitive humidity sensor with remarkable accuracy.…”

“…The effort of developing and producing humidity sensors with superior stability and sensitivity in the low humidity range are complex endeavor, owing to a multitude of circumstances. Several factors contribute to the challenges faced in this context, including inadequate sensitivity, excessive noise, complexities in signal digitization, and the influence of additional variables such as harsh ambient conditions and temperature. − The aforementioned aspects add to the intricacy of the measuring process, hence posing challenges in attaining the intended level of stability and sensitivity in humidity sensors. The measurement of yield is an essential parameter in assessing the adequacy of sensor manufacturing processes.…”

“…Additionally, it denotes the total expenditure associated with the sensor. The available literature indicates that only a few research groups have conducted experiments specifically focused on low/trace humidity sensors. ,,,, The manufacturing process of low humidity sensors poses significant challenges, leading to frequent instances of elevated costs. The cost of a commercial trace moisture sensor, which measures moisture levels between 0 and 1000 ppm, is approximately 50 times more compared to a relative humidity sensor.…”

Design and Fabrication of PVA-SnO2 Based Humidity Sensors

“…Of particular interest is SnO 2 , which is known to be versatile and has been used in many sensor applications, including humidity-sensing materials [20]. Besides metal oxides, polymers have also been commonly used in humidity sensing, such as polyimide [21], polymethyl methacrylate (PMMA) [22], and polyvinyl alcohol (PVA) [23]. This polymer material can be found easily in nature.…”

Compact QEPAS humidity sensor in SF6 buffer gas for high-voltage gas power systems

“…Furthermore, it is hard to distinguish dew or frost ice when the mirror surface temperature stays between − 20 ℃ and 0 ℃, due to the appearance of the supercooling effect. Another commonly used method is a capacitive polymer sensor, which is quick measuring and much cheaper than chilled mirror technology [26] . On the downside, the short service life, poor selectivity, and limited operating temperature range limit its performance in practical application.…”