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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 20, Issue 6 - Nov 2011
Volume 20, Issue 5 - Sep 2011
Volume 20, Issue 4 - Jul 2011
Volume 20, Issue 3 - May 2011
Volume 20, Issue 2 - Mar 2011
Volume 20, Issue 1 - Jan 2011
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Analytic Formulation of Transmission Light Intensity of Hole Blockers in Intensity-based Polymer Optical Fiber Sensors
Kwon, Il-Bum ; Kim, Chi-Yeop ; Shim, Chan-Wook ; Hwang, Du-Sun ; Chung, Yung-Joo ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 221~225
DOI : 10.5369/JSST.2011.20.4.221
Intensity-based optical fiber sensors are devised using a blocker which is located between two polymer optical fibers(POFs), one fiber is light-in and the other is light-out. This blocker is moved by an external displacement. Therefore, finding a general formulation of the relation between this displacement and transmission light intensity of various blockers is important to help develop intensity-based optical fiber sensors. In this paper, we consider blockers with arbitrary shapes from circular holes to inclined angled blockers. The transmission light intensities of such blockers should be determined by this generalized equation. In order to verify this equation, the calculated intensities of the blockers are compared with the values acquired from experiment. In the comparison, it is shown that the analytic equation can give the exact values of the transmitted light intensities for the assorted blockers. The range of the displacement measurement is also shown to be about 6 times of the radius of the hole in the case of a 9 degree inclined angle blocker.
Characteristics of Protein G-modified BioFET
Sohn, Young-Soo ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 226~229
DOI : 10.5369/JSST.2011.20.4.226
Label-free detection of biomolecular interactions was performed using BioFET(Biologically sensitive Field-Effect Transistor) and SPR(Surface Plasmon Resonance). Qualitative information on the immobilization of an anti-IgG and antibody-antigen interaction was gained using the SPR analysis system. The BioFET was used to explore the pI value of the protein and to monitor biomolecular interactions which caused an effective charge change at the gate surface resulting in a drain current change. The results show that the BioFET can be a useful monitoring tool for biomolecular interactions and is complimentary to the SPR system.
Highly-Efficient Optical Gating in Vanadium Dioxide Junction Device
Lee, Yong-Wook ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 230~233
DOI : 10.5369/JSST.2011.20.4.230
In this paper, highly-efficient optical gating in a junction device based on vanadium dioxide(
) thin film grown by a sol-gel method was investigated as a gate terminal of a three-terminal device using infrared light with a wavelength of ~1554.6 nm. Due to the photoinduced phase transition, the threshold voltage of the
junction device, at which the device current abruptly jumps, could be tuned with a sensitivity of ~96.5 V/W by adjusting the optical power of the infrared light directly illuminating the device. Compared with the tuning efficiency of the previous device fabricated using
thin film deposited by a pulsed laser deposition method, the threshold voltage of this device could be tuned by ~76.8 % at an illumination power of ~39.8 mW resulting in a tuning efficiency of ~1.930 %/mW, which is ~4.9 times larger than the previous device.
Micro pH Sensor Using Patterned Hydrogel with pH Indicators
Jang, Ji-Sung ; Kwon, Sung-Hoon ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 234~237
DOI : 10.5369/JSST.2011.20.4.234
This paper presents a study into pH Indicator-Embedded hydrogel micro-particles which are encoded various shapes according to the captured indicator. We incorporate various pH indicators into a photo-curable hydrogel, PEG-DA(Poly(ethylene glycol) diacrylate). Using the latest fluidic lithography techniques, we can easily fabricate variously patterned hydrogel particles based on in-situ photopolymerization of the PEG-DA in a micro-fluidic channel. The shape of the particle is related to the pH indicator inside the particle. We demonstrate that the micro pH sensors change their colors according to the pH levels. The micro pH sensors have various characteristics that are related to the curing time, particle size, etc. By changing these conditions, we can adjust the long term stability and reaction time of the hybrid micro pH sensors.
Fabrication of a Low Frequency Vibration Driven Electromagnetic Energy Harvester Using FR-4 Planar Spring and Its Characteristics
Lee, Byung-Chul ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 238~242
DOI : 10.5369/JSST.2011.20.4.238
This paper describes the fabrication and characteristics of a low frequency vibration driven electromagnetic energy harvester. The fabricated generator consists of a permanent magnet of NdFeB, a FR-4 planar spring and a Copper cylinder type coil. ANSYS modal analysis was used to determine the resonant frequency for the generator. The implemented generator is capable of producing up to 550 mV peak-to-peak under 7 Hz frequency, which has a maximum power of
with load resistance of
. This device is shown to generate sufficient power at different resonating modes, and the experimental and simulated results are discussed and composed.
Development of Sensing System for an Engine Oil Deterioration Detection Sensor Integrated with an Oil Filter
Chun, Sang-Myung ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 243~248
DOI : 10.5369/JSST.2011.20.4.243
The purpose of this study is to develop a sensing system to measure the capacitance of a pre-developed engine oil deterioration detection sensor integrated with an oil filter. To measure the capacitance of engine oil in the sensor, it is used the way measuring the electric charging time in a capacitor by impressing DC volt. This method has merits on cost and signal stability. The measured capacitance is compensated by comparison with the one measured by an impedance analyzer. Also, using the dielectric constant gained by an impedance analyzer, the calculating equation of the dielectric constant of engine oil related with the currently developed sensor is decided. Finally, the degradation degree of engine oil is estimated according to the change rate of dielectric constant between green oil and used oil. The newly developed personal controller is to control a series of the processes.
Fabrication of Vibration-Driven Electromagnetic Energy Harvester with Spring-Less and Its Characteristics
Ryu, Kyeong-Il ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 249~253
DOI : 10.5369/JSST.2011.20.4.249
This paper describes the fabrication and characteristics of vibration-driven electromagnetic energy harvester without spring to use at low frequency like a human body motion. The implemented energy harvester consists of NdFeB magnets, copper coil. The optimization of induced voltage was done by the various widths of coil, number of the turns, size of fixed and moving magnets and thicknesses of the cylinder. The fabricated energy harvester is capable of producing up to 15.0
for basic model and 28.80
for improved model at 5.0 Hz resonance frequency and 0.75 g acceleration level. The basic model and improved model are provided a maximum power of 6.375 mWand 25.831 mW at 1 KHz of load resistance in rectifier circuit.
Current Stimulator with Adaptive Supply Regulator for Artificial Retina Prosthesis
Ko, Hyoung-Ho ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 254~259
DOI : 10.5369/JSST.2011.20.4.254
In this paper, a current stimulator circuit with adaptive supply regulator for retinal prosthesis is proposed. In current stimulation systems, the stimulating circuits with wide voltage swing range are needed due to the high impedance of the retina cell and microelectrodes. Thus, previous researches adopt the high voltage architecture to obtain the enough operating range. The high voltage architecture, however, could increase the power consumption and can damage the retina cells. The proposed circuit provides the adaptively regulated supply voltage by measuring the difference between desired stimulation current and the actual stimulation current. The proposed circuit can achieve the extended range of the allowable cell impedance, improved accuracy of the stimulation current, and higher biosafety.
Magnetic Sensitivity Improvement of Silicon Vertical Hall Device
Ryu, Ji-Goo ; Kim, Nam-Ho ; Chung, Su-Tae ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 260~265
DOI : 10.5369/JSST.2011.20.4.260
The silicon vertical hall devices are fabricated using a modified bipolar process. It consists of the thin p-layer at Si-
, interface and n-epi layer without
buried layer to improve the sensitivity and influence of interface effects. Experimental samples are a sensor type I with and type H without p+isolation dam adjacent to the center current electrode. The experimental results for both type show a more high current-related sensitivity than the former's vertical hall devices. The sensitivity of type H and type I are about 150 V/AT and 340 V/AT, respectively. This sensor's behavior can be explained by the similar J-FET model.
Development of Reflection-type Fiber-optic pH Sensor Using Sol-gel Film
Yoo, Wook-Jae ; Seo, Jeong-Ki ; Jang, Kyoung-Won ; Moon, Jin-Soo ; Han, Ki-Tek ; Park, Jang-Yeon ; Lee, Bong-Soo ; Cho, Seung-Hyun ; Heo, Ji-Yeon ; Park, Byung-Gi ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 266~271
DOI : 10.5369/JSST.2011.20.4.266
A reflection-type fiber-optic pH sensor, which is composed of a pH sol-gel film, plastic optical fibers, a mirror, a light source and a spectrometer, is developed in this study. As pH indicators, a bromthymol blue, a cresol red and a thymol blue are used, and they are immobilized in the sol-gel films. The emitted light from a light source is guided by a fiber-optic Y-coupler and plastic optical fibers to the pH sol-gel film in a pH sensing probe. The pH change in the sensing probe gives rise to a change in the color of the pH sol-gel film, and the optical characteristic of reflected light through the pH sol-gel film is also changed. Therefore, we have measured the spectra of reflected lights, which are changed according to the color variations of the pH sol-gel films with different pH values, by using of a spectrometer. Also, the relationships between the pH values and the intensities of reflected lights are obtained on the basis of the color variations of the pH sol-gel films.
Implementation of Binaural Communication Open Platform for Binaural Hearing Aids Developing
Kim, Dong-Wook ; Park, Ju-Man ; Wei, Qun ; Lim, Hyung-Gyu ; Park, Hee-Joon ; Seong, Ki-Woong ; Lee, Jyung-Hyun ; Kim, Myoung-Nam ; Cho, Jin-Ho ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 272~278
DOI : 10.5369/JSST.2011.20.4.272
Recently, the performance of binaural hearing aids is rapidly improved with the technology advancement of wireless communication, digital signal processing, and integrated circuit design. However, the previous hearing aids developer platforms can't be applied to binaural hearing aids developing, because it has no consideration for wireless communication and binaural hearing control. Also, the previous developer platforms are not easy to use for the algorithm development, because programming languages are limited. In this paper, we designed and implemented the open platform board for binaural hearing aids developing. The designed board can be programmed by general programming language and can be used wireless communication module. In order to verify the designed open platform board, we used the volume control algorithm using two open platform board. As a result of experiment, we verified the performance of designed and implemented open platform board that was successfully operated the binaural hearing control and the wireless communication.
A Study on the Measurement of Halitosis of Human Mouth with Chemical Gas Sensor Arrays
Lee, Seok-Jun ; Kim, Sun-Tae ; Kim, Han-Soo ;
Journal of Sensor Science and Technology , volume 20, issue 4, 2011, Pages 279~285
DOI : 10.5369/JSST.2011.20.4.279
This study was carried out to apply chemical gas sensors for the identification of bad breath which is one of the important sensitive problem for the humans' daily life. Seven sensors, including five semiconductor sensors and two electrochemical sensors, were tested for the three panels three times in several conditions. The results showed that the reproducibility of sensors were generally good, and electrochemical sensors showed better reproducibility while semiconductor sensors showed better sensitivity. No rinsing before measurement showed relatively better results in terms of both sensitivity and reproducibility. Semiconductor gas sensors for hydrogen sulfide shows the highest sensitivity, and it was recommended to use the odor-free bag for the measurement of bad breath.