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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 9, Issue 6 - Nov 2000
Volume 9, Issue 5 - Sep 2000
Volume 9, Issue 4 - Jul 2000
Volume 9, Issue 3 - May 2000
Volume 9, Issue 2 - Mar 2000
Volume 9, Issue 1 - Jan 2000
Selecting the target year
A study on the low-frequency of acoustic sensor using single mode FBG (Fiber Bragg Grating).
Kim, Kyung-Bok ; Kwack, Kae-Dal ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 396~403
The low- frequency acoustic sensor using the recently developed FBG has an excellent merits which the existing fiber-optic sensor has and also it has an excellent signal sensing effect in the environment of low-frequency(
). Furthermore, we can expect the utilization of low-frequency signal defection instead of existing microphones in the environment of electric noise and also it can be developed as the high-sensibility multiplexing through the sensor array system.
An Application of Solenoid Eddy Current Sensor for Nondestructively Inspecting Deterioration of Overhead Transmission Lines due to Forest Fires
Kim, Sung-Duck ; Kim, Young-Dal ; Jeong, Dong-Hwa ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 404~415
This paper describes several performances and nondestructive inspection for deterioration due to forest fires in overhead transmission lines. After discussing corrosion mechanism such as atmospheric and galvanic corrosion for aged ACSR conductors and its detection for them are presented. Through impedance analysis of a solenoid coil, it is shown that the eddy current sensor may be available to inspect severe fault or local corrosion. As the solenoid coil changes its impedance when the test conductor is inserted into the coil, it can be possible to measure deterioration degree caused by forest fires. Tensile strength, extension rate and sensor impedance are tested for some samples degraded by artificial fire. As increasing blazed period to some extent, the strength of aluminum strand begins to be reduced remarkably, while galvanized steel strand holds the similar strength to the initial value, despite of appearing a little loss of zinc layer. In general, it is shown that the sensor impedance would be increased while the tension load of conductor is reduced and the extension rate is contrarily increased. Therefore, the sensor output could exhibit the changes of mechanical performances, and would be used to detect such deterioration caused by forest fire in ACSR conductors built on the ridge of mountains. Finally, it was verified that the solenoid coil could be applicable to obtain any crucial inform for serious deterioration due to forest fires.
A New Technique for Improvement of Dynamic Range in Fiber Optic Acoustic Sensor using Sagnac Interferometers
Nam, Sung-Hyun ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 416~423
A new demodulation technique which can be used for the fiber optic acoustic sensor system using Sagnac interferometer is described. The theoretical limitation in dynamic range of the quadrature demodulation technique can be removed by the proposed BPSK(Binary Phase Shift Keying) demodulation technique. Full demodulation of input acoustic signal is possible with just simple electronics by eliminating the necessity of the high frequency phase modulation. This technique is suitable for digital signal processing of fiber optic sensor systems and can be applicable for other interferometers.
Design and fabrication of a comb-type differential pressure sensor with silicon beams embedded in a silicone rubber membrane
Park, Jeong-Yong ; Kong, Sung-Soo ; Seo, Chang-Taeg ; Shin, Jang-Kyoo ; Koh, Kwang-Rak ; Lee, Jong-Hyun ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 424~429
A novel differential pressure sensor has been developed with silicon beams embedded in a silicone rubber membrane. The transducer is usable for most applications involving exposure to harsh media. A piezoresistive differential pressure sensor using silicone rubber membrane has been fabricated on the selectively diffused (100)-oriented n/n+/n silicon substrates by a unique silicon micro-machining technique using porous silicon etching. The pressure sensitivity is about
and the non-linearity is less than 0.1%.
Effect of Ultra-thin Catalyst Deposited upon
Thin Film on CO Sensitivity
Lee, Hye-Jung ; Song, Jae-Hoon ; Kwon, Soon-Nam ; Kim, Tae-Song ; Kim, Kwang-Ju ; Jung, Hyung-Jin ; Choi, Won-Kook ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 430~439
-based thin film sensor with 500-600 nm thick was fabricated for the detection of CO gas by rf magnetron sputtering. In order to improve both sensitivity to CO gas and selectivity to hydrogen gas containing -CH, ultra-thin transition metal Co catalyst was sputtered over
thin film and annealed at
. Sensitivity to CO was maximum at the thickness of Co 2.1 nm and
, and that to
was at the thickness of Co 1.4 nm and
. From the x-ray photoelectron spectroscopy (XPS) result, ultra-thin Co was existed into CoO covered with
particles, and thus p-n junction of
-CoO(p-type) was thought to be formed. In this p-n junction type sensors, sensing mechanism with reducing gases can be explained by the variation of depletion layer thickness formed in the interface.
Development of Classification System for Material Temperature Responses Using Neuro-Fuzzy Inference
Ryoo, Young-Jae ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 440~447
This paper describes a practical system to classify material temperature responses by composition of curve fitting and neuro-fuzzy inference. There are problems with a classification system which utilizes temperature responses. It requires too much time to approach the steady state of temperature response and it has to be filtered to remove the noise which occurs in experiments. Thus, this paper proposes a practical method using curve fitting only for transient state to remove the above problems of time and noise. Using the neuro-fuzzy system, the thermal conductivity of the material can be inferred on various ambient temperatures. So the material can be classified via its inferred thermal conductivity. To realize the system, we designed a contact sensor which has a similar structure with human finger, implemented a hardware system, and developed a classification software of curve fitting and neuro-fuzzy algorithm.
The Implementation of The Multi-Subject, Multi-Channel Optical Telemetry System for Physiological Signals
Park, Cha-Hun ; Park, Jong-Dae ; Seo, Hee-Don ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 448~454
This paper describes the implementation of a multi-subject, multi-channel optical telemetry system for the short range measurement of electrocardiograms (EKGs) a system which receives command signals and transmits physiological signals to the external system using LED (Light Emitting Diode) and PD (Photodiode). This system decreases the dependency of power supply voltage to the CMOS IC chips and a new enforced synchronization technique using infrared bi-directional communication has also been proposed. The telemetry IC with the size of
has the following functions: receiving of command signal, initialization of internal state of all functional blocks, decoding of subject selection signal, time division multiplexing of 4-channel modulated physiological signals, transmission of modulated signals to external system, and auto power down control.
Crystal Structure and Optical Absorption of ZnO Thin Films Grown by Electrodeposition
Choi, C.T. ; Seo, J.N. ;
Journal of Sensor Science and Technology , volume 9, issue 6, 2000, Pages 455~460
Zinc oxide(ZnO) thin films were cathodically deposited on ITO glass from an aqueous zinc nitrate electrolyte. Three main fabrication parameters were taken into account : deposition potential, solution concentration and growth temperature. Different layers of ZnO thin films grown by varying the three parameters were studied by X-ray diffraction, scanning electron microscope and optical absorption spectroscopy. The prepared ZnO thin films were shown as a hexagonal wurtzite structure on the X-ray diffraction patterns and the good quality of ZnO thin films were obtained by potentiostatic cathodic deposition at -0.7V vs. Ag/AgCl reference electrode onto ITO glass from aqueous 0.1 mol/liter zinc nitrate electrolyte at