The transient response of capacitive thin-jïlm polymer humidity sensors to step changes in humidity and temperature as a function of air velocity was investigated. Two duct-mounted humidity sensors (designated Candidate X and Candidate Y) from two manufacturers, each with thin-film capacitive humidity sensing elements and temperature output, were used in the study. The transient performance of ...

In this study, the electrical characteristics and surface reactions of three different kinds of In2O3 based gas sensors were investigated under CO exposure in dry and humid air by using DC electrical resistance measurements and Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). For the first time one gains insight into the surface reactions during the exposure to CO and humid...

Quartz crystal microbalance (QCM) electrodes modified with nano-thin films were used to develop a system for measuring significant environment changes (smoke, humidity, hazardous material release). A layer-by-layer approach was used for the deposition of sensitive coatings with a nanometer thickness on the electrode surface. The QCM electrode was modified with self-assembled alternate layers of...

An non-contact type application on the permanent magnet and linear Hall-effect sensors gauging rotary system is introduced in this paper. For such a contactless system, there will be low wear exhaust. This leads to a longer life span in association, and in particular, high reliability to achieve continuous use. The main component of the angular gauge depends on the Hall voltage under the rotati...

The application of triangulation laser displacement sensors to the continuous in-situ monitoring of the response of wooden cultural objects to variations in temperature and relative humidity in their environment is reported. The sensors are robust, fast, and precise, provide non-contact measurements, and are capable of operating in the field. They have been applied to monitor the response of th...

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

In this paper, we investigate the humidity sensing properties of an organic dye material (E)-2-(4-(2-(3,4-dimethoxybenzeylidene)hydrazinyl)phenyl)ethane-1,1,2-tricarbonitrile (DMBHPET). The sensors were fabricated by making pairs of aluminum electrodes on glass substrates. The gap between the electrodes was 40 lm. The active layer was deposited in the gap using the drop casting technique. The r...

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...

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.

Poly(3-methylthiophene) (PMeT) thin films were electrochemically deposited on quartz crystal microbalance QCM transducers to investigate their volatile organic compound (VOC) sensing properties depending on ambient conditions. Twelve different VOCs including alcohols, ketones, chlorinated compounds, amines, and the organosphosphate dimethyl methylphosphonate (DMMP) were used as analytes. The re...