SENSORS, 2002 IEEE
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New surface acoustic wave gas sensor of the mass-sensitive type sensitive to the thermal properties of gases
Tập 1 - Trang 372-375 vol.1
The basic principles of a new surface acoustic wave (SAW) gas sensor are described. Being essentially a sensor of the mass-sensitive type, the proposed device possesses certain features of the thermometric SAW sensors and is not only sensitive to the vapors of volatile substances, but capable of detecting gases by their thermal properties as well. This principles consists of making a certain delay......
#Surface acoustic waves #Acoustic waves #Gas detectors #Gases #Temperature sensors #Sensor phenomena and characterization #Thermal sensors #Sensor systems #Surface acoustic wave devices #Acoustic sensors
Dynamic link labels for energy efficient MAC headers in wireless sensor networks
Tập 2 - Trang 1520-1525 vol.2
Sensor data typically consists of packets with small payloads due to which the MAC header is a significant and energy-expensive overhead. We present a scheme that replaces conventional MAC addresses with dynamically assigned short link labels that are spatially reused. This would be useful in self-configuring sensor networks. We also present an encoded representation of these labels for use in dat......
#Energy efficiency #Intelligent networks #Wireless sensor networks #Sensor phenomena and characterization #Distributed algorithms #Scalability #Batteries #Payloads #Routing #Telecommunication traffic
Current sensor in PCB technology
Tập 2 - Trang 779-784 vol.2
A novel DC/AC current sensor works on the fluxgate principle. The core in the form of a 7/10 mm ring made of electrodeposited Permalloy is sandwiched into the middle of the printed circuit board (PCB), while the sensor excitation winding is also integrated in the copper layers of the PCB. In order to lower the sensor power consumption, the excitation winding was tuned by a parallel capacitor. The ......
#Sensor phenomena and characterization #Integrated circuit technology #Printed circuits #Copper #Capacitive sensors #Energy consumption #Capacitors #Frequency #Linearity #Hysteresis
Low-cost magnetic torque sensor principle
Tập 2 - Trang 901-904 vol.2
The torque is measured in a contactless technique without special treatment of the shaft, using the magneto-elastic effect of ferromagnetic materials. Strain or stress due to moments lead to a change of magnetic properties of the material (hysteresis deformation, permeability changes). Magnetoelastic sensors are distinguished by robustness and good reproducibility. However, inhomogeneities of the ......
#Magnetic sensors #Magnetic materials #Saturation magnetization #Shafts #Magnetic hysteresis #Stress #Torque measurement #Magnetic field induced strain #Magnetic properties #Permeability
Determination of the sensitivity behaviour of an acoustic and thermal flow sensor by electronic characterisation
Tập 2 - Trang 1298-1303 vol.2
The Microflown is an acoustic and thermal flow sensor that measures the sound particle velocity instead of sound pressure. For most applications the Microflown should be calibrated, which is usually performed acoustically in a standing-wave-tube. Here it is shown that the sensor's sensitivity and frequency behaviour can be determined electronically as well, and an electronic method for determinati......
#Thermal sensors #Acoustic sensors #Wires #Equations #Frequency #Acoustic devices #Sensor phenomena and characterization #Acoustic measurements #Temperature sensors #Temperature distribution
SnO/sub 2/ sensors with variable operating temperature for CO detection: selectivity enhancement
Tập 1 - Trang 361-365 vol.1
SnO/sub 2/ sensors are widely used for the detection of air contaminants such as CO. Nevertheless, their application encounters many problems, first of all the effect of interfering gases. The low selectivity is in fact a well-known problem of these sensors. Moreover, the high operating temperature of metal oxide sensors implies in general high power consumption. In this work we present a study ai......
#Gas detectors #Temperature sensors #Ethanol #Sensor phenomena and characterization #Sensor arrays #Gases #Energy consumption #Measurement techniques #Temperature measurement #Pulse measurements
Commercialization of harsh environment microsystems - existing challenges
Tập 2 - Trang 1105-1108 vol.2
This paper describes the existing challenges being experienced by the Glennan Microsystems Initiative in its goal to commercialize microsystems technology for application in harsh environments. The Glennan Microsystems Initiative develops, applies and commercializes microsystems technology for harsh environments. This Initiative integrates and augments substantial microsystems resources that curre......
#Commercialization #Space technology #NASA #Manufacturing industries #Chemical sensors #Research and development #Bridges #Silicon carbide #Microsensors #Government
A comparison of layered metal-semiconductor optical position sensitive detectors
Tập 2 - Trang 836-840 vol.2
Position sensitive detectors, or PSDs, utilise the lateral photovoltaic effect to produce an electrical output that varies linearly with the position of a light spot incident on a semiconductor junction. In fabricating PSDs, two key elements are optimised, the sensitivity and the linearity of the electrical output. Sensitivity can be optimised by varying properties of the junction layers, particul......
#Optical sensors #Optical detectors #Position sensitive particle detectors #Linearity #Optical films #Photovoltaic effects #Conductivity #Schottky barriers #Titanium #Aluminum
Relative humidity sensors based on porous polysilicon and porous silicon carbide
Tập 1 - Trang 499-502 vol.1
RH sensors have been made using porous polysilicon and porous SiC, both of which can also be made porous by electrochemical anodisation in HF, similarly to single crystal silicon. We show that polysilicon can be incorporated into a humidity sensor enabling a reduction (compared to single-crystal porous Si) of the effect of temperature on humidity measurements. We show that porous SiC can also be i......
#Silicon carbide #Temperature sensors #Grain boundaries #Hafnium #Temperature measurement #Humidity measurement #Electrodes #Microstructure #Doping #Current distribution
Horizontal Hall effect sensor with high maximum absolute sensitivity
Tập 2 - Trang 785-790 vol.2
Sensitivity of conventional Hall sensors is strongly limited by the well known short-circuit effect. Many researches were devoted to reduce offset and noise but few works were carried out to improve sensitivity. Here, a new shape of integrated horizontal Hall device is presented. This particular shape has been developed to minimize the short-circuit effect of the sensor, allowing one to shrink the......
#Hall effect devices #Current supplies #Voltage #Contact resistance #Shape #Strips #CMOS technology #Manufacturing processes #Electrons #Charge carrier density