SENSORS, 2002 IEEE

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A gazing point distance detection system for accommodation assisting glasses
SENSORS, 2002 IEEE - Tập 2 - Trang 905-910 vol.2
T. Fujita, S. Sato, M. Idesawa
Proposes a gazing point distance detection system which is one of the important key issues in order to realize accommodation assisting glasses, automatic focusing glasses which can assist eye focusing for aged persons who suffer from presbyopia. The new system has a tunnel type light path device which consists of very narrow tunnels with the opening of a vertically long rectangle. The tunnels are ...... hiện toàn bộ
#Glass #Lenses #Vision defects #Focusing #Aging #Automatic control #Gravity #Iris #Manufacturing #Position sensitive particle detectors
Sub-micron range thickness measurements using a novel scanning heterodyne optical interferometer
SENSORS, 2002 IEEE - Tập 2 - Trang 1080-1084 vol.2
N.A. Riza, M.A. Arain
Introduces a novel and highly accurate method of thickness measurement using a compact, high performance, scanning heterodyne optical interferometer. The instrument has the potential to measure thickness at an Angstrom resolution over a micron continuous thickness range. The instrument uses acousto-optic devices to implement rapid scanning for thickness measurements of the test medium. As the read...... hiện toàn bộ
#Optical interferometry #Thickness measurement #Optical mixing #Optical beams #Laser beams #High speed optical techniques #Optical refraction #Optical variables control #Instruments #Acoustic testing
Optical fiber sensor using tailored porous sol-gel fiber core
SENSORS, 2002 IEEE - Tập 1 - Trang 71-73 vol.1
S. Tao, C.B. Winstead, R. Jindal, J.P. Singh
Novel techniques for fabricating a porous sol-gel fiber, doping chemical reagent into the fiber, and constructing an optical fiber chemical sensor using the porous fiber as a transducer, have been invented. A moisture sensor employing a CoCl/sub 2/ doped porous sol-gel fiber as a transducer has been constructed as an example. The test result of the moisture sensor verified a conclusion from theore...... hiện toàn bộ
#Optical fiber sensors #Optical fiber communication #Optical fiber testing #Chemical sensors #Transducers #Moisture #Optical fibers #Light sources #Humidity #Coatings
Thermally activated ageing of polysilicon
SENSORS, 2002 IEEE - Tập 1 - Trang 602-606 vol.1
M. Ehmann, F. Schubert, P. Ruther, O. Paul
Thermally induced resistance changes and long term stability of polysilicon resistors were characterized for temperatures up to 1400 K. For this purpose, a new test microstructure was developed which is based on a micro hotplate with a central polysilicon resistor as the material under test and two polysilicon heaters for temperature cycling of the membrane. This test system allows the separate me...... hiện toàn bộ
#Aging #Thermal resistance #Resistors #Materials testing #Resistance heating #Temperature dependence #Switches #Cooling #Thermal stability #Microstructure
An Internet-based, inverse-GPS system for monitoring and tracking mobile aquatic sensors
SENSORS, 2002 IEEE - Tập 2 - Trang 1734-1739 vol.2
J. Howell, J. Frolik
This paper presents a novel, Internet-based system designed for continual monitoring and tracking of mobile aquatic sensors. A general overview of current positioning and tracking techniques is presented. The paper then details the two facets of the proposed system: (1) the sensors and signal processing for positioning and monitoring; and (2) the Internet-based tracking. The signal processing syst...... hiện toàn bộ
#Internet #Monitoring #Sensor systems #Signal processing algorithms #Databases #Data mining #Face #Hardware #Signal processing #Web pages
The design of a real time VLSI optical centroid processor
SENSORS, 2002 IEEE - Tập 1 - Trang 5-10 vol.1
Boon Hean Pui, B. Hayes-Gill, M. Clark, M. Somekh, Chung See, S. Morgan, A. Ng
A real time VLSI optical centroid processor has been developed as part of a larger Shack-Hartmann wavefront sensor system for applications in adaptive optics. The implementation of the optical centroid detection system was demonstrated successfully using a hardware emulation system. Subsequently, the design has been implemented as a single-chip solution. This has advantages in terms of power consu...... hiện toàn bộ
#Optical design #Very large scale integration #Adaptive optics #Optical sensors #Real time systems #Sensor systems #Optical detectors #Hardware #Emulation #Energy consumption
Optical and electrical gas sensing properties of In/sub x/O/sub y/N/sub z/ films
SENSORS, 2002 IEEE - Tập 1 - Trang 623-626 vol.1
M. Ando, H. Steffes, R. Chabicovsky, M. Haruta, G. Stangl
In this paper we describe the optical and electrical gas sensing properties of In/sub x/O/sub y/N/sub z/ films promoted by an ultra-thin gold overlayer. We have fabricated In/sub x/O/sub y/N/sub z/ films with a nanocrystalline porous structure by RF-sputtering in Ar/N/sub 2/ followed by an annealing process. Gold particles with 20-30 nm diameter on top of the In/sub x/O/sub y/N/sub z/ films have b...... hiện toàn bộ
#Optical films #Optical sensors #Temperature sensors #Absorption #Wavelength measurement #Gold #Hydrogen #Temperature measurement #Fluid flow measurement #Temperature distribution
Low-cost magnetic torque sensor principle
SENSORS, 2002 IEEE - Tập 2 - Trang 901-904 vol.2
H. Ruser, U. Troltzsch, M. Horn
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 ...... hiện toàn bộ
#Magnetic sensors #Magnetic materials #Saturation magnetization #Shafts #Magnetic hysteresis #Stress #Torque measurement #Magnetic field induced strain #Magnetic properties #Permeability
Dynamically reconfigurable vision with high performance CMOS active pixel sensors (APS)
SENSORS, 2002 IEEE - Tập 1 - Trang 21-26 vol.1
B. Pain, Chao Sun, C. Wrigley, Guang Yang
A high-performance computational imager based on integration of CMOS active pixel imager array with on-chip signal processing and control via a new column-parallel architecture is presented. Unlike CCDs and other CMOS imagers, the sensor is capable of providing simultaneous image data from three flexible, partially overlapping, dynamically reconfigurable regions of interest (ROIs) with different s...... hiện toàn bộ
#CMOS image sensors #Pixel #Intelligent sensors #Target tracking #CMOS process #Array signal processing #Process control #Computer architecture #Spatial resolution #Power dissipation
Micro-electro-mechanical digital-to-analog converter based on a novel bimorph thermal actuator
SENSORS, 2002 IEEE - Tập 2 - Trang 1036-1041 vol.2
Qingquan Liu, Qing-An Huang
A novel micro-electro-mechanical digital-to-analog converter based on a bimorph thermal actuator (bimorph MEMDAC) is proposed in the paper. Driven by four-bit digital voltage of 5 V, it can produce out-of-plane deflection. Compared to the conventional bimorph thermal actuators driven by analog voltages, it could be controlled precisely by digital voltages. Finite element analysis, in which a three...... hiện toàn bộ
#Digital-analog conversion #Actuators #Voltage #Resistors #Finite element methods #Silicon #Heating #Micromechanical devices #Electronic circuits #Thermal resistance
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