A hygrometer is an apparatus that measure humidity. Modern electronic devices use temperature of condensation or change in electrical capacitance to measure humidity difference. Humidity sensors are employed to provide an indication of moisture levels in the environment. To measure moisture level, various technologies are used. A capacitive type moisture sensor consisting of nanoporous thin fil...

The humidity sensing characteristics of different sensing materials are important properties in order to monitor different products or events in a wide range of industrial sectors, research and development laboratories as well as daily life. The primary aim of this study is to compare the sensing characteristics, including impedance or resistance, capacitance, hysteresis, recovery and response ...

This paper presents a method for the remote interrogation of batteryless humidity sensors based on statistical estimations and three-dimensional beam scanning techniques. As a proof-of-concept demonstration, a Van-Atta reflectarray sensor is interrogated with a 24 GHz Frequency-Modulated ContinuousWave transceiver at various reading ranges. The extension of the proposed approach to passive or m...

Graphite oxide has been investigated as a possible room-temperature chemiresistive sensor of ammonia in a gas phase. Graphite oxide was synthesized from high purity graphite using the modified Hummers method. The graphite oxide sample was investigated using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetry and differential scanning calorimet...

This paper proposes non-fragile compliant humidity sensors that can be fabricated inexpensively on various types of nano-porous polymer membranes such as polycarbonate, cellulose acetate, and nylon membranes. The sensor contains a pair of interdigitated electrodes deposited on the nano-porous polymer membranes. The resistance and/or capacitance between these electrodes vary at different humidit...

Due to the necessity of the automation and control of processes in agriculture, as well as to the crescent interest for the environmental monitoring, efforts have been demanded in the development of more versatile, reliable sensors and sensor systems with smaller cost [1,2]. In this sense, the search of new materials, the modeling study of sensor and the development of new measurement technique...

Polyvinylidene fluoride (PVDF) is considered to be one of the most promising candidates for next-generation wearable sensors; however, sensing ability PVDF worth expanding beyond its ferroelectricity. In this work, used as matrix material humidity detection by adding two other ingredients: lithium chloride (LiCl) and polyvinyl alcohol (PVA), optimal concentrations LiCl PVA are found systematic ...

The kinetic behaviour of humidity sensors based on a cross-linked interpenetrated polyelectrolyte was investigated. Various parameters were changed in order to study their effect on the response to a humidity variation. The influence of the way of preparation of the polymer and of the sensing layer thickness are reported and discussed.