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
Electronic interface modules for solid-state chemical sensors
Tập 1 - Trang 344-349 vol.1
Plug and play modules for interfacing three common types of solid-state chemical sensors are presented The self-contained (integrated circuit) modules detect a baseline signal from a sensor and auto-zero the signal to compensate for baseline variations, both immediately after fabrication and periodically during the lifetime of the sensor The signal compensation technique is based on the governing ......
#Solid state circuits #Chemical sensors #Polymer films #Chemical analysis #Performance analysis #Sensor phenomena and characterization #Nonvolatile memory #Application specific integrated circuits #Plugs #Signal detection
Just add sensor - integrating analog and digital signal conditioning in a programmable system on chip
Tập 1 - Trang 665-668 vol.1
Programmable mixed signal microcontrollers offer opportunities for the design of very low cost smart sensors.. A number of examples are shown which illustrate the performance and flexibility of the PSoC microcontroller in sensor applications.
#Sensor systems #Electrical resistance measurement #Pulse width modulation #Central Processing Unit #Intelligent sensors #Resistors #Communication system control #Clocks #Current measurement #Registers
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
An adaptive fuzzy-logic procedure for ranking logical sensory performance
Tập 2 - Trang 1317-1322 vol.2
Multiple sensors are necessary for mobile robot operation in unknown environments. The multitude of sensors must be fused. For reliable fusion it is important to determine the performance of each sensor. A sensor ranking procedure based on an adaptive fuzzy logic algorithm for sensor fusion was developed. The procedure assumes unknown a-priori sensory performance and ranks the sensors according to......
#Sensor fusion #Fuzzy logic #Performance evaluation
Stress free quad beam optical silicon accelerometer
Tập 2 - Trang 1064-1068 vol.2
An optical accelerometer is presented in this paper. The working principle is based on the variation of the output light intensity versus the acceleration. The variation is due to the misalignment of ARROW waveguides defined on the accelerometer mass and frame. The accelerometer consists of a quad beam structure with four lateral beams to increase the sensitivity. The technology for the fabricatio......
#Optical beams #Stress #Silicon #Accelerometers #Optical sensors #Optical waveguides #Fabrication #Acceleration #Optical surface waves #Micromachining
Silicon micromechanical structures fabricated by electrochemical process
Tập 1 - Trang 575-579 vol.1
Silicon (Si) micromechanical structures were fabricated by means of sacrificial layers defined with porous silicon (PS) and masked by hydrogen ion implantation with adequate thermal annealing. The fabrication process to remove the PS layers with diluted KOH at room temperature does not cause damage in remaining Si microstructures which have less than 1 /spl mu/m thickness controlled by the anodiza......
#Silicon #Micromechanical devices #Electrochemical processes #Hydrogen #Ion implantation #Annealing #Fabrication #Microstructure #Temperature control #Thickness control
Signal architecture for a Distributed Magnetic Local Positioning System
Tập 2 - Trang 1497-1504 vol.2
This paper presents the Distributed Magnetic Local Positioning System, which can be used by a mobile robot to measure absolute position and attitude, even in the cluttered environment of an office building or warehouse. The system is based on extremely low frequency magnetic fields, which have excellent characteristics for penetrating line-of-sight obstructions. Multiple beacons distributed throug......
#Magnetic field measurement #Buildings #Frequency #Additive white noise #Mobile robots #Position measurement #Noise reduction #Gaussian noise #Low-frequency noise #Magnetic noise
A single-chip pH sensor fabricated by a conventional CMOS process
Tập 1 - Trang 350-355 vol.1
A pH sensor fabricated on a single chip by an unmodified commercial CMOS process is described The sensor comprises a circuit for making differential measurements between ISFET and REFET both biased by the same reference electrode. The ISFET has a floating electrode structure and uses the silicon nitride passivation layer as the pH sensitive material. It is found to have a large threshold voltage c......
#CMOS process #Electrodes #FETs #Circuits #Semiconductor device measurement #Silicon #Threshold voltage #Biosensors #Dielectrics and electrical insulation #Hydrogen
Energy trapping in mesa-shaped quartz crystal microbalance
Tập 2 - Trang 1154-1159 vol.2
In this paper, the energy trapping problem in AT-cut quartz mesa structures is studied. Results show that the mesa structure is able to trap thickness-shear vibration energy within a much smaller area compared with a conventional electroded plate. The optimum sizes of these mesa structures are obtained through this study.
#Electrodes #Structural beams #Coupled mode analysis #Vibrations #Equations #Power engineering and energy #Motion analysis #Elasticity #Voltage