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
Thermomagnetic residual offset in integrated Hall plates
Tập 2 - Trang 763-766 vol.2
Integrated Hall plates show self-induced offset due to the current flow in its current leads. The magnetic field surrounding the current leads causes a magnetic offset signal, while their resistive heating causes thermoelectric offset voltages. This paper reports experimental results on these two effects. They are obtained using a novel test structure enabling one to separate the two contributions......
#Current measurement #Thermoelectricity #Testing #Voltage measurement #Temperature #Magnetic field measurement #Thermoelectric devices #Magnetic fields #Resistors #Probes
Magnetic angular encoder using an automatic offset compensation technique
Tập 2 - Trang 767-770 vol.2
Quality and resolution of integrated microsystems using Hall sensors dedicated to an angular encoder are strongly dependent on the accuracy of relative position of Hall sensors and on the offset of electronic frontend circuitry. In this paper, we describe a CMOS microsystem built on two integrated circuits. This contactless encoder microsystem gives three sine and square signals with a phase shift......
#Magnetic sensors #Voltage #Permanent magnets #Calibration #CMOS integrated circuits #Feedback #Assembly #Engines #Permanent magnet motors #Micromotors
Active structural error suppression in MEMS vibratory gyroscopes
Tập 2 - Trang 1089-1094 vol.2
Due to restrictive tolerancing, structural imperfections that reduce the performance of fabricated micro devices are typical. While feedback control is normally used to compensate for these imperfections, we show that this is insufficient for suppressing errors without interfering with device performance. The only alternatives are costly and time consuming post processing or the implementation of ......
#Micromechanical devices #Gyroscopes #Feedback control #Electrodes #Electrostatics #Aerospace engineering #Error correction #Force control #Actuators #Optical device fabrication
Embedded micromachined fibre optic Fabry-Perot pressure sensors in aerodynamics applications
Tập 2 - Trang 1707-1712 vol.2
Small size, high bandwidth pressure sensors are required for instrumentation of probes and test models in aerodynamic studies of complex unsteady flows. Optical fibre pressure sensors promise potential advantages of small size and low cost in comparison with their electrical counterparts. We describe miniature Fabry-Perot cavity pressure sensors constructed by micromachining techniques in a turbin......
#Fiber optics #Fabry-Perot #Optical fiber sensors #Optical sensors #Aerodynamics #Turbines #Blades #Testing #Bandwidth #Instruments
Detection and sizing of micro bubbles in streaming fluids with ultrasound
Tập 1 - Trang 528-531 vol.1
The detection of micro bubbles in fluids is of great practical interest in many medical and biotechnological applications, particularly with the extracorporeal circulation. A self calibrating system is presented which allows a continuous detection and determination of the micro bubble size distribution of tube flows in a range between 10 and 250 /spl mu/m in diameter. The measuring system is based......
#Ultrasonic imaging #Ultrasonic variables measurement #Size measurement #Application software #Computerized monitoring #Condition monitoring #Heart #Lungs #Research and development #Filters
A Pt/Ga/sub 2/O/sub 3//SiC Schottky diode based hydrocarbon gas sensor
Tập 2 - Trang 1115-1119 vol.2
This paper presents the propene gas sensing performance of Pt/Ga/sub 2/O/sub 3//SiC based Schottky diodes. The metal oxide semiconducting Ga/sub 2/O/sub 3/ thin films were doped with Zn and prepared by the sol-gel process. The thin films were deposited onto the SiC by the spin coating technique and a Pt layer was deposited on the top of the metal oxide forming the Schottky diode. The sensor respon......
#Silicon carbide #Schottky diodes #Hydrocarbons #Gas detectors #Temperature sensors #Hydrogen #Zinc #Platinum #Semiconductivity #Semiconductor thin films
SOI CMOS gas sensors
Tập 2 - Trang 1379-1384 vol.2
In this paper we review the development of CMOS compatible gas sensors, introduce the recent concept of SOI smart gas sensors, and discuss in detail the advantages/disadvantages of micromachined SOI technology compared to bulk technology. We begin by discussing the concept of integrated sensors and the need for low-cost, reliable and battery-operated gas-sensing systems. We continue with a review ......
#Gas detectors #CMOS technology #Temperature sensors #Intelligent sensors #Thermal sensors #Silicon #Biomembranes #Chemical sensors #Automotive engineering #Electrodes
Neural network aided estimation of near-surface material properties using planar type micromagnetic sensors
Tập 2 - Trang 747-752 vol.2
The impedance of a coil in proximity of any metal surface is a complex function of many parameters including near-surface properties (such as conductivity, permeability, liftoff etc.) of the material. The transfer impedance (i.e., the ratio between the sensing voltage and the exciting current) of the planar type micromagnetic sensors consisting of exciting and sensing coil is used for the estimati......
#Neural networks #Material properties #Micromagnetics #Surface impedance #Coils #Conductivity #Permeability #Conducting materials #Inorganic materials #Voltage