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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Sensor Science and Technology
Journal Basic Information
Journal DOI :
The Korean Sensors Society
Editor in Chief :
Volume & Issues
Volume 6, Issue 6 - Nov 1997
Volume 6, Issue 5 - Sep 1997
Volume 6, Issue 4 - Jul 1997
Volume 6, Issue 3 - May 1997
Volume 6, Issue 2 - Mar 1997
Volume 6, Issue 1 - Jan 1997
Selecting the target year
The Study on Characteristics of Platinum Thin Film RTD Temperature Sensors with Annealing Conditions
Chung, Gwiy-Sang ; Noh, Sang-Soo ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 81~86
Platinum thin films were deposited on
substrates by DC magnetron sputtering for RTD (resistance thermometer devices) temperature sensors. The resistivity and sheet resistivity of these films were decreased with increasing the annealing temperature and time. We made Pt resistance pattern on
substrate by lift-off method and fabricated Pt-RTD temperature sensors by using W-wire, silver epoxy and SOG(spin-on-glass). In the temperature range of
, we investigated TCR(temperature coefficient of resistance) and resistance ratio of Pt-RTD temperature sensors. TCR values were increased with increasing the annealing temperature, time and the thickness of Pt thin films. Resistance values were varied linearly within the range of measurement temperature. At annealing temperature of
, time of 240min and thin film thickness of
, we obtained TCR value of
close to the Pt bulk value.
Impedance Analysis and Experimental Study of a Solenoid Eddy Current Sensor to Detect the Cross-sectional Area of Non-ferromagnetic Stranded Conductors
Kim, S.D. ; Shim, J.M. ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 87~94
Impedance analysis of a Solenoid sensor to detect the cross-sectional area of non-ferromagnetic stranded conductors is described in this paper. To inspect electromagnetic characteristics of conductive materials, a nondestructive test eddy current sensor with an encircling coil is chosen. As solving Maxwell equation, normalized impedance response of the sensor within a conducting rod is modeled and the results are expanded to the stranded wires. Geometrical property affecting on stranded structure is considered and a numerical and experimental study is also presented.
Analysis of the Digital Phase Tracking Technique for Fiber-Optic Gyroscope
Yeh, Y.H. ; Cho, S.M. ; Kim, J.H. ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 95~105
A new open-loop signal processing technique of digital phase tracking is known to have a Potential to solve the problems in the open-loop processor such as limited dynamic range, dependence on the optical intensity fluctuations, and dependence on gain fluctuations of signal path. But new problems with digital phase tracking must be solved before it can be a useful signal processing method. In this paper, barriers to the success of the digital phase tracking such as harmonics content, phase difference, amplitude variations of the phase modulation(PM) signal, bandwidth limit of the signal path, and the implementation of the mixer, are pointed out and their effects on the performance of the signal processor are analyzed to calculate the requirements of the signal processor for
An Efficient Coding of Remotely Sensed Satellite Image
Kim, Young-Choon ; Ban, Seong-Won ; Lee, Kuhn-Il ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 106~114
In this paper, we propose an efficient coding method of remotely sensed satellite image using region classification and interband prediction. This method classifies each pixel vector considering spectral characteristics of satellite image data. Then we perform the classified intraband VQ to remove spatial (intraband) redundancy for a reference band image. To remove interband redundancy effectively, we perform the classified interband prediction for the remaining band images. Experiments on LANDSAT TM satellite image show that coding efficiency of the proposed method is better than that of the conventional Gupta's method.
Automatic Tuning Architecture of RC Time-Constant due to the Variation of Integrated Passive Components
Lee, Sung-Dae ; Hong, Kuk-Tae ; Jang, Myung-Jun ; Chung, Kang-Min ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 115~122
In this paper, on-chp atomatic tuning circuit, using proposed integration level approximation technique, is designed to tuning of the variation of RC time-constant due to aging or temperature variation, etc. This circuit reduces the error, the difference between code values and real outputs of integrator, which is drawback of presented dual-slope tuning circuit and eliminates modulations of processing signals in integrated circuit due to fixed tuning codes during ordinary operation. This system is made up of simple integrator, A/D converter and digital control circuit and all capacitors are replaced by programed capacitor arrays in this system. This tuning circuit with 4 bit resolution achieves
of RC time constant error for 50% resistance variation.
High Speed Self-Adaptive Algorithms for Implementation in a 3-D Vision Sensor
Miche, Pierre ; Bensrhair, Abdelaziz ; Lee, Sang-Goog ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 123~130
In this paper, we present an original stereo vision system which comprises two process: 1. An image segmentation algorithm based on new concept called declivity and using automatic thresholds. 2. A new stereo matching algorithm based on an optimal path search. This path is obtained by dynamic programming method which uses the threshold values calculated during the segmentation process. At present, a complete depth map of indoor scene only needs about 3 s on a Sun workstation IPX, and this time will be reduced to a few tenth of second on a specialised architecture based on several DSPs which is currently under consideration.
Improvement of reliability of an ISFET pH-meter by employing multiple sensors
Chang, Kee-Seok ; Cho, Byung-Woog ; Kim, Chang-Soo ; Choi, Sang-Bok ; Sohn, Byung-Ki ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 131~136
The ISFET(ion sensitive field effect transistor), a semiconductor ion sensor, has many advantages over conventional ion sensors. Various single-sensor type ISFET pH-meters have been developed. However, they could not be applied in fields because their performances are directly affected by the sensor condition. With only one sensor, the system could be easily damaged from environmental factors, and reliability of it is decreased. Therefore, a 4-channel PH-meter system is proposed to improve the reliability of ISFET pH-meter. It has 4 ISFETS as ion sensor, and a software which contains a new calibration and measurement algorithm appropriate to the system. The reliability of the system was proved by measuring hydrogen ion concentration in the pH standard solutions and buffer solutions.
A 10-bit 40-MS/s Low-Power CMOS Pipelined A/D Converter Design
Lee, Sea-Young ; Yu, Sang-Dae ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 137~144
In this paper, the design of a 10-bit 40-MS/s pipelined A/D converter is implemented to achieve low static power dissipation of 70 mW at the
or +5 V power supply environment for high speed applications. A 1.5 b/stage pipeline architecture in the proposed ADC is used to allow large correction range for comparator offset and perform the fast interstage signal processing. According to necessity of high-performance op amps for design of the ADC, the new op amp with gain boosting based on a typical folded-cascode architecture is designed by using SAPICE that is an automatic design tool of op amps based on circuit simulation. A dynamic comparator with a capacitive reference voltage divider that consumes nearly no static power for this low power ADC was adopted. The ADC implemented using a
n-well CMOS technology exhibits a DNL of
LSB, INL of +1/-0.75 LSB and SNDR of 56.3 dB for 9.97 MHz input while sampling at 40 MHz.
Design Automation of High-Performance Operational Amplifiers
Yu, Sang-Dae ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 145~154
Based on a new search strategy using circuit simulation and simulated annealing with local search, a technique for design automation of high-performance operational amplifiers is proposed. For arbitrary circuit topology and performance specifications, through discrete optimization of a cost function with discrete design variables the design of operational amplifiers is performed. A special-purpose circuit simulator and some heuristics are used to reduce the design time. Through the design of a low-power high-speed fully differential CMOS operational amplifier usable in smart sensors and 10-b 25-MS/s pipelined A/D converters, it has been demonstrated that a design tool developed using the proposed technique can be used for designing high-performance operational amplifiers with less design knowledge and less design effort.
Properties of ZnO Films on r-plane Sapphires Prepared by Ultrasonic Spray Pyrolysis
Ma, Tae-Young ; Moon, Hyun-Yul ; Lee, Soo-Chul ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 155~162
Zinc oxide(ZnO) thin films were deposited on r-plane sapphires from a solution containing zinc acetate. The films were obtained in a hot wall reactor by the pyrolysis of an aerosol produced by an ultrasonic generator. The crystallinity, surface morphology and composition of the films have been studied using the x-ray diffraction method(XRD) scanning electron microscopy(SEM) and Auger electron spectroscopy (AES) respectively. The influences of the substrate temperature on the crystallinity of the films were studied. Strongly (110) oriented ZnO films were obtained at a substrate temperature of
. The resistivity was increased to above
with copper doping and vapor oxidation.
Dependence of the Electrical and Optical Properties of CdS Thin Films on Substrate and Annealing Temperatures
Park, Ki-Cheol ; Shim, Ho-Seob ; Kim, Jeong-Gyoo ;
Journal of Sensor Science and Technology , volume 6, issue 2, 1997, Pages 163~171
CdS thin films for window material of solar cell were prepared by close spaced vapor transport deposition system and annealed at different temperatures. The structural, electrical, and optical properties of as-deposited and annealed CdS films were investigated as functions of substrate and annealing temperatures. The CdS thin films were grown perpendicularly to the substrate along the (002)plane with hexagonal structure regardless of the preparation conditions The resistivity of the CdS film deposited was increased gradually from
. The optical transmittance at the substrate temperature of
was about 80% in the the visible spectrum. The resistivity increased monotonically, and the optical transmittance was decreased substantially with annealing temperature due to the increased defect density in the CdS film.