SENSORS, 2002 IEEE
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
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
The wavelength sensor using optical directional coupler
Tập 1 - Trang 83-85 vol.1
This paper proposes a wavelength sensor based on an optical directional coupler. The finite-difference time-domain (FDTD) method is used to calculate of the light intensity propagating thorough the structure, and to find the appropriate dimensions of the structure. The device with the width and thickness of 0.4 /spl mu/m/spl times/0.6 /spl mu/m, which corresponds to the coupling length of 40 /spl ......
#Optical sensors #Directional couplers #Optical propagation #Finite difference methods #Optical refraction #Optical variables control #Time domain analysis #Optical coupling #Refractive index #Signal resolution
OMNIVIEWS: direct omnidirectional imaging based on a retina-like sensor
Tập 1 - Trang 27-30 vol.1
Traditionally the acquisition of real time panoramic images has been performed by the usage of lenses or mirrors coupled with standard image sensors, which give distorted images. In this paper we will present a system composed of a mirror and a log polar sensor, which is able to provide directly understandable images.
#Image sensors #Cameras #Mirrors #Lenses #Optical distortion #Surveillance #Intelligent sensors #Navigation #Optical sensors #Hardware
Examination of thin porous mono- and multilayer structures containing an underlayer of porous silicon
Tập 1 - Trang 572-574 vol.1
The paper is devoted to examination of porous silicon properties and structures obtained by molecular beam epitaxy (MBE) methods by methods of ellipsometric porosity measurement. These methods allow one to gain general porosity allocation of pores on the sizes, and also to explore adsorption and optical properties of a material. Also application of an ellipsometric porosity measuring method is des......
#Nonhomogeneous media #Silicon #Optical films #Molecular beam epitaxial growth #Substrates #Physics #Optical materials #Sensor phenomena and characterization #Etching #Optical buffering
GaPO/sub 4/ crystals for sensor applications
Tập 1 - Trang 589-593 vol.1
The piezoelectric crystal material gallium (ortho) phosphate GaPO/sub 4/ can be considered to be the "high tech brother of quartz". The high thermal stability up to 970/spl deg/C and its high sensitivity make GaPO/sub 4/ a very attractive choice for a wide range of high temperature applications. Furthermore it shows no pyroelectricity, no outgassing and a high electric resistivity to guarantee hig......
#Temperature sensors #Thermal stability #Crystalline materials #Piezoelectric materials #Temperature distribution #Pyroelectricity #Electric resistance #Electric variables measurement #Piezoelectric films #Thickness measurement
Sensor applications at Kennedy Space Center (KSC)
Tập 2 - Trang 1713-1717 vol.2
Transducers used at KSC, in support of processing and launch of flight vehicles and payloads, are designed and tested to meet specific program requirements. Any equipment, transducer or support instrumentation in direct contact or in support to flight vehicle operations is considered ground support equipment (GSE) and required to meet strict program requirements (i.e. Space Shuttle Program, Space ......
#Transducers #Ground support #Instruments #Space shuttles #Payloads #Testing #Land vehicles #Road vehicles #Space stations #Space vehicles
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
Esbus - a sensor bus based on the SPI serial interface
Tập 2 - Trang 1516-1519 vol.2
A local sensor bus for transmitting data from several digital smart sensors to an Internet interface was tested. The master/slave type bus is based on the three-wire SPI (serial peripheral interface) bus, which is built into most microcontrollers. At the sensor end, after A/D conversion of the analog sensor signals and further processing of the digitized data, the data is formatted into standard 8......
#Intelligent sensors #Temperature sensors #Internet #Master-slave #Sensor phenomena and characterization #Testing #Microcontrollers #Signal processing #Code standards #Analog computers
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