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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
Fabrication of an acceleration sensor using silicon micromachining and reactive ion etching
Kim, Dong-Jin ; Kim, Woo-Jeong ; Choi, Sie-Young ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 430~436
A piezoresistive acceleration sensor for 30 G has been fabricated by silicon micromachining method using SDB(silicon direct bonding) wafer. The structure of the piezoresistive acceleration sensor consists of a seismic square pillar type mass and four beams. This structure was fabricated by reactive ion etching and chemical etching using KOH-etchant. The rectangular square structure is used in order to compensate the deformation of the edges due to underetching. The fabricated sensor showed a linear output voltage-acceleration characteristics and its sensitivity was about
from 0 to 10 G.
Simple Iysine sensing system using
electrode and enzyme immobilized to CNBr-activated sepharose 4B
Kim, Eun-Jung ; Koh, Kwang-Nak ; Choi, Myung-Sook ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 437~444
A potentiometric L-lysine-selective sensor is described for the direct determination of lysine. The sensor system is based on a carbon dioxide gas sensing electrode and an L-lysine decarboxylase immobilized to CNBr-activated sepharose 4B. A highly selective L-lysine sensor has been prepared with immobilizing enzyme slurry put into reaction buffer solution. The optimum conditions for the measurement were evaluated by various experiments. This sensor exhibits a linear response to L-lysine concentrations from
. Response time of this lysine sensor is shorter than 30secs and the immobilized enzyme slurry is stable over one year.
Fabrication and Characterization of Thick Film Ammonia Gas Sensor
Yun, Dong-Hyun ; Kwon, Chul-Han ; Hong, Hyung-Ki ; Kim, Seung-Ryeol ; Lee, Kyu-Chung ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 445~450
An ammonia gas sensor with high sensitivity using thick-film technology were fabricated and examined. The material for sensing the ammonia gas was the mixture of oxide semiconductor,
. The sensor exhibits resistance increase upon exposure to low concentration of ammonia gas. The resistance of the sensor is decreased, on the other hand, for exposure to reducing gases such as ethyl alcohol, methane, propane and carbon monoxide. A novel method for detecting ammonia gas quite selectively utilizing a sensor array consisting of an ammonia gas sensor and a compensation element were proposed and developed. The compensation element is a Pt-doped
gas sensor which shows opposite direction of resistance change in comparison with that of the ammonia gas sensor upon exposure to ammonia gas. Excellent selectivity has been achieved using the sensor array having two sensing elements.
Sensing Properties of Oxide Semiconductor Thick Films
Kim, Seung-Ryeol ; Yun, Dong Hyun ; Hong, Hyung-Ki ; Kwon, Chul-Han ; Lee, Kyu-Chung ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 451~457
The thick films of oxide semiconductors such as
and ZnO for the
detection of sub-ppm range have been prepared and their characteristics were investigated. It is showed that the optimum operating temperatures of the sensors are
-based thick films, and ZnO-based thick films, respectively. Since the resistance of ZnO-based thick films are extremely high(
), the signal to noise ratio was comparatively low. In order to determine the selectivity, the films are exposed to the interfering gases such as ozone, ammonia, methane and the mixture of carbon monoxide and propane.
-ZnO(3 wt.%) and
(3 wt.%) thick film sensors show high sensitivity, good selectivity, excellent reproducibility and the linearity of
concentration versus sensor resistance. The preliminary results clearly demonstrated that the sensor can be successfully applied for the detection of
in sub-ppm range.
A Theory of the Geological Magnetic Filter for the Improvement of the Signal to Noise Ratio of the Magnetic Detection System
Kim, Won-Ho ; Kim, Eun-Ro ; Yang, Chang-Sub ; Choi, In-Kyu ; Choi, Jun-Rim ; Park, Jong-Sik ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 458~465
In this paper, a theory of the geological magnetic filter for the improvements of the signal to noise ratio of the magnetic detection system has been developed. The geological magnetic filter takes two sequences of magnetic fields measured from the reference sensor and the detector sensor and calculate the correlations between them in the frequency domain. Using the filter, we can remove the coherent noises in the time domain and improve the signal to noise ratio of the magnetic detection system. With the recent developments of the DSP hardware technology the geological magnetic filter can be easily implemented using the digital signal processor. We show the ability of the geological magnetic filter under various circumstances through computer simulations. Numerical simulation results show that geological magnetic filter can excellently remove the sensor misalignment effects and the regular short range local noise as well as it delete the coherent noises.
Design of Implantable Middle Ear Hearing Aids Using an Electromagnetic Transducer
Cho, Jin-Ho ; Song, Byung-Seop ; Kim, Myoung-Nam ; Won, Chul-Ho ; Park, Se-Kwang ; Lee, Sang-Heun ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 466~475
In this paper, an implantable middle ear hearing aids using an electromagnetic transducer which consists of a tiny coil and a magnet is designed, and objective design method to implement a vibrator of the electromagnetic type transducer is proposed. Sound characteristic of the electromagnetic type vibrator is excellent but power transfer rate is lower than that of a ceramic type. To improve power transfer efficiency of system, external and inner part of a middle ear system is designed using FM transmission method. We implemented an experimental set of the designed transducer, inner part, and outer part. Then, we measured vibration characteristics of a metal strip and a temporal bone of a dead body. As the results, we confirmed the advantage of FM method and showed that designed transducer could effectively transmit vibration of amplified input sound pressure to ossicle.
Fabrication and Characterization of Portable Electronic Nose System for Identification of CO/HC Gases
Hong, Hyung-Ki ; Kwon, Chul-Han ; Yun, Dong-Hyun ; Kim, Seung-Ryeol ; Lee, Kyu-Chung ; Kim, In-Soo ; Sung, Yung-Kwon ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 476~482
A portable electronic nose system has been fabricated and characterized using an oxide semiconductor gas sensor array and pattern recognition techniques such as principal component analysis and back-propagation artificial neural network. The sensor array consists of six thick-film gas sensors whose sensing layers are Pd-doped
+ Pd coated layer,
-doped ZnO and
. The portable electronic nose system consists of an 16bit Intel 80c196kc as CPU, an EPROM for storing system main program, an EEPROM for containing optimized connection weights of artificial neural network, an LCD for displaying gas concentrations. As an application the system has been used to identify 26 carbon monoxide/hydrocarbon (CO/HC) car exhausting gases in the concentration range of CO 0%/HC 0 ppm to CO 7.6%/HC 400 ppm and the identification has been successfully demonstrated.
Mobility Determination of Thin Film a-Si:H and poly-Si
Jung, S.M. ; Choi, Y.S. ; Yi, J.S. ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 483~490
Thin film Si has been used in sensors, radiation detectors, and solar cells. The carrier mobility of thin film Si influences the device behavior through its frequency response or time response. Since poly-Si shows the higher mobility value, a-Si:H films on Mo substrate were subjected to various crystallization treatments. Consequently, we need to find an appropriate method in mobility measurement before and after the anneal treatment. This paper investigates the carrier mobility improvement with anneal treatments and summarizes the mobility measurement methods of the a-Si:H and poly-Si film. Various techniques were investigated for the mobility determination such as Hall mobility, HS, TOF, SCLC, TFT, and TCO method. We learned that TFT and TCO method are suitable for the mobility determination of a-Si:H and poly-Si film. The measured mobility was improved by
orders after high temperature anneal above
and grain boundary passivation using an RF plasma rehydrogenation.
Development of PLT(
) pyroelectric materials
Park, Sung-Kun ; Bae, Seung-Choon ; Kim, Ki-Wan ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 491~499
We fabricated the ceramic PLT tablet which was composed of 5, 10 and 15 mol% lanthanum concentration and thin film PLT to develope pyroelectric materials, and investigated their characteristics. Using TG/DTA, we determined calcination and sintering temperature to sinter the PLT completely and to prevent volatilization of the Pb components. The calcination and sintering temperature were
respectively, and there was a lot of mass loss at higher sintering temperature. By measuring temperature-dielectric constant characteristics of ceramic tablet we investigated dielectric constant characteristics depends on La concentration. The Curie point of PLT with 5, 10 and 15 mol% lanthanum concentration were
respectively. Using PLT ceramic tablet we observed IR detection characteristics, and then deposited PLT thin film by rf magnetron sputtering. We verified that PLT thin film fabricated with completely sintered PLT target had the same structure to target by investigating lattice constant and optical transparency.
The effect of thermal treatment of shape memory alloy with the kind of impurity
Park, Sung-Kun ; Yoo, Pyung-Kil ; Jeen, Gwang-Soo ; Kim, Ki-Wan ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 500~507
For fine control of operating temperature of shape memory alloy, we investigated the effect of thermal teratment of shape memory alloy with the impurity kind. The martensitic transformation temperature in a Cu-17.25Zn-15Al and Cu-17.25Zn-15Al-1Ag/Fe was measured using electrical resistivity as a function of quenching temperature. Order-disorder phase transition temperatures in parent phase were measured and kind of transition were distinguised by DSC(differential scanning calorimeter) with heating rate variation. And structual changes were studied with XRD. For the Cu-17.25Zn-15Al shape memory alloy, the order-disorder phase transition temperature,
was 809K and 610K and for the Cu-17.25Zn-15Al-1Ag and Cu-17.25Zn-15Al-1Fe specimen
was 794K and 610K, and 803K and 613K, respectively. In all the specimens, quenching from near
leads to an increase in martensitic temperature, whereas quenching from near
leads to an decrease in martensitic temperature.
Molecular System Design for the Acetylcholine Fluorescent Chemosensor
Kah, Kwang-Nak ;
Journal of Sensor Science and Technology , volume 6, issue 6, 1997, Pages 508~513
We exploited a new molecular system - acetylcholine (neurotransmitter) detection system as a building block for the perfect molecular information system (sensing membrane of the chemical sensor) - using water soluble calix[n]arene-p-sulfonates which are useful even in aqueous (water/methanol) neutral solution. This achievement is due to several outstanding properties of these calix[n]arene derivatives such as low
values, cation-interactions, and high water-solubility, etc.