Two Surface acoustic wave (SAW) resonators were fabricated on langasite substrates with Euler angle of (0°, 138.5°, 117°) and (0°, 138.5°, 27°). A dipole antenna was bonded to the prepared SAW resonator to form a wireless sensor. The characteristics of the SAW sensors were measured by wireless frequency domain interrogation methods from 20 °C to 600 °C. Different temperature behaviors of the se...

An acoustic relative humidity sensor for air-steam mixtures in duct flow is designed and tested. Theory, construction, calibration, considerations on dynamic response and results are presented. The measurement device is capable of measuring line averaged values of gas velocity, temperature and relative humidity (RH) instantaneously, by applying two ultrasonic transducers and an array of four te...

ZnO and ZnO: Mn nanocrystals were synthesized via reverse micelle method. The structural properties of nanocrystals were investigated by XRD. The XRD results indicated that the synthesized nanocrystals had a pure wurtzite (hexagonal phase) structure. Resistive gas sensors were fabricated by providing ohmic contacts on the tablet obtained from compressed nanocrystals powder and the installation ...

Metal-ceramic coaxial cable Fabry-Pérot interferometric (MCCC-FPI) sensors have been developed using a stainless steel tube and a stainless steel wire as the outer and inner conductors, respectively; a tubular α-alumina insulator; and a pair of air gaps created in the insulator along the cable to serve as weak reflectors for the transmitting microwave (MW) signal. The MCCC-FPI sensors have been...

The DRAM cells consist of one or several MOSFET devices and the subthreshold leakage current through the MOSFET strongly depends on the temperature variation. Therefore, it is obvious that the leakage of a memory cell is highly related to temperature variation. The temperature of the circuit can be measured indirectly by using leakage sensors which can be applied to various VLSI circuits becaus...

In this contribution we deal with technology potential of the low temperature co-fired ceramic (LTCC) in association with design, development and production of organometallic thick film gas sensors. Customer demands to the gas sensors array and to the joint construction of the sensing part with evaluating ASIC led to the exploitation of LTCC potential in the production technology. The presented...

Temperature distribution is a critical indicator of the health condition for Liquefied Petroleum Gas (LPG) storage tanks. In this paper, we present a large-scale wireless temperature monitoring system to evaluate the safety of LPG storage tanks. The system includes wireless sensors networks, high temperature fiber-optic sensors, and monitoring software. Finally, a case study on real-world LPG s...

A review is given on sensors fabricated by silicon micromachining technology using the thermal domain for the measurement of fluid flow. Attention is paid especially to performance and geometry of the sensors. Three basic types of thermal jlow sensors are discussed: anemometers, calorimetric flow sensors and time of flight flow sensors. Anemometers may comprise several heaters and temperature s...

This paper reports on the design and analysis of a novel thermal single-axis microelectromechanical gyroscope. The gyroscope consists of a heated, pressure driven liquid flowing in a microchannel and two temperature sensors that detect the temperature difference between the two opposite walls of the channel. When an external rotation is applied, the resulting Coriolis acceleration acting on the...

Qualitatively, the temperature of an object is determined by the sensation of heat or cold felt by touching an object. Technically, temperature is a measure of the average kinetic energy of the particles in a sample of matter, expressed in units of degrees on a standardized scale. You can measure temperature in many different ways that vary in cost of equipment and accuracy. Thermocouples are o...