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Due to the growing demand for humidity control systems, there is a need for small, cheap, accurate and reliable sensors for air relative humidity (RH) measurements. In this paper, a resonant air relative humidity sensor is presented. The sensor is based on a quartz crystal coated on both surfaces with a hygroscopic polymer. Due to the adsorption of water molecules, the polymer mass increases accordingly...
Liquids density measurements are highly required in both research and industrial applications, from process control in petrochemical industry to product monitoring in food processing. Commercial devices are often expensive or unwieldy; therefore, in a previous work, a cheap and handy resonant sensor, based on a piezoelectric bimorph, was introduced. The operating principle is based on the variation...
Due to the widespread use of portable devices, there is a strong focus on possible methods of interaction between man and the device, in order to exchange information. Capacitive touchscreens are commonly used on the front of smartphones or tablets; nevertheless, for some applications it can be useful to have a pointing solution on the back of the device, so that fingers do not cover the visible area...
Density is a characteristic property of a substance related to its mass and its volume. On-line density sensors play an important role in several industrial applications, for example in the monitoring of liquid products. In this work a resonant sensor to measure the density of liquids is proposed. The sensor active element is a piezoelectric bimorph, extensively used in buzzers and telephone receivers...
Nanostructured materials, due to their peculiar physical and chemical properties, constitute the new class of functional supports for specific innovative applications. There is a strong competition between synthetic, man-made nanostructured materials and those coming directly from nature: the first ones can be precisely tailored by properly design and fabrication; the second ones are directly available...
Density is one of the characteristic properties of a substance and on-line density sensors are of interest in many industrial fields. In this paper, a piezoelectric density sensor is proposed and analyzed with FE methods and experimentally. The active element of the proposed density sensor is a cheap piezoceramic bimorph, widely used in buzzers and telephone receivers; the bimorph is clamped all around...
Diatomite is a natural fossil material of sedimentary origin, composed by fragments of diatom siliceous skeletons. Due to its chemical inertness, thermal stability, high surface area, non-toxicity and biocompatibility, diatomite is considered an ideal material for the preparation of diatomite silica drug delivery nanocarriers. In this work, the properties of diatomite nanoparticles (DNPs) as potential...
A trackpad is a pointing device, featuring a tactile sensor, able to translate the motion and position of a user's finger, or a stylus, to a relative position on the device screen. In this work, we analyze the possibility to use the back cover of tablets or smartphones as trackpad, capable of detecting the presence and position of a finger on their external surface. In order to convert the smart device...
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