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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 Development of Ultrasonic Urine Volume Detection Sensor and the Correlation between Urine Volume and Bladder Interwall Distance
Choi, H.H. ; Lee, E.H. ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 256~267
In this paper, we studied the ultrasonic urine volume sensor of urinary alarm system for home use to detect the time of urination as a assistive methodology for the incontinence patients and the correlation between urine volume and bladder interwall distance by using developed sensor. The developed sensor was designed to minimize the measurement error by using ultrasound with 2.25 MHz center frequency which provides higher resolution as well as longer penetration depth. To verify usefulness of the developed sensor, we performed a preliminary experiment of estimating bladder volume from the measured distance between interior and posterior wall of bladder. In the preliminary experiment, bladder volume estimated from the result using a commercial ultrasonography system. The experimental results show there exists god correlation between the actual urine volume and the measured interwall distance of the bladder. In conclusion, the developed ultrasound bladder volume sensor can be applied to an urine alarm system which provides patient the exact time of urination, it will be contribute in health care and welfare society.
Temperature Compensation of Hot-film Flow Sensor
Kim, Hyung-Pyo ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 268~273
This paper represents a hot-film flow sensor which is compensated by a noble temperature compensation method using the initial unbalanced voltage. The resistance value of the sensor is determined by using the graph of the initial unbalanced voltage of an open-loop circuit against the air temperature. The compensation is accomplished by applying the unbalanced ratio of the resistors in the Wheastone bridge circuit. In the range of air temperature of
, the error is about
Application of Commercial PIN Photodiodes to develope Gamma-Ray Dosimeters
Jeong, Dong-Hwa ; Kim, Sung-Duck ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 274~280
This paper deals with an experimental study to apply commercial semiconductors to measure radiation dose rate for gamma ray. Since the low cost, small size, high efficiency and ruggedness of silicon photodiodes make them attractive photodetectors, they coulde be effectively used in measuring any radiation such as gamma ray. Most PN photodiodes show that the reverse current increases when the light is increased. Therefore the depletion region of them have influence on the reverse current, so we choose silicon PIN photodiodes with large depletion region. In order to detect radiation dose rate and then, to apply in developing any gamma ray dosimeter, some examinations and experiments were performed to PIN photodiodes in this work. Two kinds of PIN photodiodes, such as NEC's PH302 and SIEMENS's BPW34, were tested in a Co-60 gamma irradiation facility with a semiconductor parameter analyzer. As a result, we found that such PIN photodiodes present good linearity in diode current characteristics with dose rate. Therefore silicon PIN photodiodes could be suitably used in designing gamma ray dosimeters.
A Design and manufacture of acoustic-optic converter in the Uniform FBG hydrophone sensor.
Kim, Kyung-Bok ; Kwack, Kae-Dal ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 281~287
For the improvement of frequency characteristics of FBG(Fiber Bragg Grating) hydrophone sensor, we can detected the frequency ranging to 1.4KHz and acoustic directivity by the development of newly designed diaphragm and united type of FBG.
Thin-Film Chromel-Alumel Multijunction Thermal Converter with Low Output Resistance
Cho, Hyun-Duk ; Kim, Jin-Sup ; Shin, Jang-Kyoo ; Lee, Jong-Hyun ; Lee, Jung-Hee ; Park, Se-Il ; Kwon, Sung-Won ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 288~296
Thin-film chromel-alumel multijunction thermal converters with a low output resistance of
showed approximately the square law-dependent input-output relation. The voltage responsivities were very low with
in air and
in vacuum, respectively, and the ac-dc voltage transfer error was very large with about +340 ppm in the frequency range of
in the case of 1 V-input sinewave rms voltage. It can be concluded that the large transfer error of the thermal converter was mainly caused by the low voltage responsivity and the large heat loss due to low output resistance, which implies that the optimization for small ac-dc transfer error is required.
Isolation Technologies for Single-crystalline Silicon MEMS Structures Using Trench Oxide
Lee, Sang-Chul ; Kim, Im-Jung ; Kim, Jong-Pal ; Park, Sang-Jun ; Yi, Sang-Woo ; Cho, Dong-Il ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 297~306
To improve the performance of MEMS devices, fabricating single-crystalline silicon HARS (high aspect ratio structure) with thicknesses of up to several tens of micrometers has been an active research topic in recent years. However, achieving electrical isolation, which is required for actuating a structure or sensing an electrical signal, has been one of the main problems in single-crystalline silicon HARS fabrication technologies. In this paper, new isolation technologies using high aspect ratio oxide beams and sidewalls are developed to achieve electrical isolation between electrodes of single-crystalline silicon HARS. The developed isolation technologies use insulating oxide structural supports from either the structural sides or from the bottom. In this case because the trench oxide supports have a depth of several tens of
, the effects of residual stress must be considered. In this paper, insulating supports are fabricated using PECVD TEOS films, the residual stress of the insulating supports is measured, and the effect of the residual stress on the structure is analyzed. It is shown using microresonators, that the developed isolation technologies can be effectively used for HARS using single-crystalline silicon.
A study on the multi-point signal detection, using Passive band-pass filter in FBG Hydrophone
Kim, Kyung-Bok ; Kwack, Kea-Dal ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 307~315
To set up the arrays system of FBG(Fiber Bragg Grating) Hydrophone sensor and realize the multi-point signal detection for the wide scope underwater, using WDM(Wavelength Division Multiplexing) method and Passive band-pass filter system, underwater acoustic signal detection of the newly designed two FBG Transducers is successfully experimented. As a result of the experiment, it was possible each signal with different frequent signals is detected for the multi-point up to 1.3KHz in underwater. We can, therefore, prove the possibility on the system design of Hydrophone sensor arrays, using the newly made FBG Transducers.
Absolute phase identification algorithm in a white light interferometer using a cross-correlation of fringe scans
Kim, Jeong-Gon ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 316~326
A new signal processing algorithm for white light interferometry has been proposed and investigated theoretically. The goal of the algorithm is to determine the absolute optical path length of an interferometer with very high precision (<< one optical wavelength). The algorithm features cross-correlation of interferometer fringe scans and hypothesis testing. The hypothesis test looks for a zero order fringe peak candidate about which the cross-correlation is symmetric minimizing the uncertainty of misidentification. The shot noise limited performance of the proposed signal processing algorithm has been analyzed using computer simulations. Simulation results were extrapolated to predict the misidentification rate at Signal to-Shot noise ratio (SNR) higher than 31 dB. Root-mean-square phase error between the computer-generated zero order fringe peak and the estimated zero order fringe peak has been calculated for the changes of three different parameters (SNR, fringe scan sampling rate, coherence length of light source). Results of computer simulations showed the ability of the proposed signal processing algorithm to identify the zero order fringe peak correctly. The proposed signal processing algorithm uses a software approach, which is potentially inexpensive, simple and fast.
Power Durability Properties of Surface Acoustic Wave Filters for Mobile Telecommunications
Nam, Hyo-Duk ; Kim, Dong-Su ; Kim, Hung-Rak ; Kim, Kwang-Il ;
Journal of Sensor Science and Technology , volume 9, issue 4, 2000, Pages 327~333
Transversal SAW(Surface Acoustic Wave) filters of 340MHz were fabricated on piezoelectric substrates of the LN
Y-X wafers. Both of spacing and width of IDT were
. For improving the power durability characteristics, titanium layer was inserted between aluminum electrode and piezoelectric substrate since it has high density, low thermal expansion coefficient, and good adhesive properties. Power durability was evaluated with respect to the thickness of inserted titanium layer and the temperature of heat treatment. Power durability is improved with increasing the thickness of the inserted titanium layer. Moreover, it is remarkably improved by heat treatment at the temperature of