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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Sensor Science and Technology
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Journal DOI :
The Korean Sensors Society
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Volume & Issues
Volume 21, Issue 6 - Nov 2012
Volume 21, Issue 5 - Sep 2012
Volume 21, Issue 4 - Jul 2012
Volume 21, Issue 3 - May 2012
Volume 21, Issue 2 - Mar 2012
Volume 21, Issue 1 - Jan 2012
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A Simple Capacitive Sensor Array Based on a Metal-Insulator-Metal Structure
Lee, Hee-Ho ; Choi, Jin-Hyeon ; Ahn, Jung-Il ; Kim, Chang-Soo ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 83~89
DOI : 10.5369/JSST.2012.21.2.83
A simple array of metal-insulator-metal capacitive elements was proposed for a potential application in humidity sensing platforms. We fabricated meso-scale sensors with different sizes(large-size:
) and characterized the performance of each design. Polyimide films were utilized as a humidity-sensitive layer. Capacitance changes of the polyimide layer were measured with respect to water absorption. The device showed sensitivity in the full range of relative humidity (RH) with excellent linearity(correlation coefficient > 0.994). This array structure exhibits unique advantages including easy fabrication process, high batch productivity, and high structural compatibility with various substrate materials. It is anticipated that this device structure will be potentially useful in unique applications including mapping spatial humidity variations over a meso-scale area and implementing flexible humidity sensing element arrays.
ISFET Glucose Sensor with Palladium Hydrogen Selective Membrane
Chung, Mi-Kyung ; Kim, Seong-Wan ; Lee, Sang-Sik ; Park, Chong-Ook ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 90~95
DOI : 10.5369/JSST.2012.21.2.90
This paper describes the development of a glucose biosensor based on ion sensitive field effect transistor(ISFET) with a palladium(Pd) modified ion sensing membrane. By adopting Pd as a hydrogen sensitive layer and integrating a screen-printed reference electrode, the sensitivity and stability were considerably improved due to the high permeability and selectivity of the Pd hydrogen selective membrane. This paper suggests a new approach for realizing portable and highly sensitive glucose sensors for diagnosing and treating diabetes mellitus.
Correction of Photometric Distortion of a Micro Camera-Projector System for Structured Light 3D Scanning
Park, Go-Gwang ; Park, Soon-Yong ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 96~102
DOI : 10.5369/JSST.2012.21.2.96
This paper addresses photometric distortion problems of a compact 3D scanning sensor which is composed of a micro-size and inexpensive camera-projector system. Recently, many micro-size cameras and projectors are available. However, erroneous 3D scanning results may arise due to the poor and nonlinear photometric properties of the sensors. This paper solves two inherent photometric distortions of the sensors. First, the response functions of both the camera and projector are derived from the least squares solutions of passive and active calibration, respectively. Second, vignetting correction of the vision camera is done by using a conventional method, however the projector vignetting is corrected by using the planar homography between the image planes of the projector and camera, respectively. Experimental results show that the proposed technique enhances the linear properties of the phase patterns that are generated by the sensor.
Measurements of Dark Area in Sensing RFID Transponders
Kang, J.H. ; Kim, J.Y. ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 103~108
DOI : 10.5369/JSST.2012.21.2.103
Radiofrequency(RF) signal is a key medium to the most of the present wireless communication devices including RF identification devices(RFID) and smart sensors. However, the most critical barrier to overcome in RFID application is in the failure rate in detection. The most notable improvement in the detection was from the introduction of EPC Class1 Gen2 protocol, but the fundamental problems in the physical properties of the RF signal drew less attention. In this work, we focused on the physical properties of the RF signal in order to understand the failure rate by noting the existence of the ground planes and noise sources in the real environment. By using the mathematical computation software, Maple, we simulated the distribution of the electromagnetic field from a dipole antenna when ground planes exist. Calculations showed that the dark area can be formed by interference. We also constructed a test system to measure the failure rate in the detection of a RFID transponder. The test system was composed of a fixed RFID reader and an EPC Class1 Gen2 transponder which was attached to a scanner to sweep in the x-y plane. Labview software was used to control the x-y scanner and to acquire data. Tests in the laboratory environment showed that the dark area can be as much as 43 %. One who wants to use RFID and smart sensors should carefully consider the extent of the dark area.
Improved Interpolating Equation for Industrial Platinum Resistance Thermometer
Yang, In-Seok ; Kim, Yong-Gyoo ; Gam, Kee-Sool ; Lee, Young-Hee ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 109~113
DOI : 10.5369/JSST.2012.21.2.109
We propose an improved interpolating equation to express temperature-resistance characteristics for modern industrial platinum resistance thermometers (PRTs). Callendar-van Dusen equation which has been widely used for platinum resistance thermometer fails to fully describe temperature characteristics of high quality PRTs and leaves systematic residual when the calibration point include temperatures above
. Expanding Callendar-van Dusen to higher-order polynomial drastically improves the uncertainty of the fitting even with reduced degrees of freedom of the fitting. We found that in the fourth-order polynomial fitting, the third-order and fourth-order coefficients have a strong correlation. Using the correlation, we suggest an improved interpolating equation in the form of fourth-order polynomial, but with three fitting parameters. Applying this interpolating equation reduced the uncertainty of the fitting to 32 % of that resulted from the traditional Callendar-van Dusen. This improvement was better than that from a simple third-order polynomial despite that the degrees of the freedom of the fitting was the same.
Development of a MEMS Resonant Accelerometer Based on Robust Structural Design
Park, U-Sung ; Boo, Sang-Pil ; Park, Soo-Young ; Kim, Do-Hyung ; Song, Jin-Woo ; Jeon, Jong-Up ; Kim, Joon-Won ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 114~120
DOI : 10.5369/JSST.2012.21.2.114
This paper describes the design, fabrication and testing of a micromachined resonant accelerometer consisting of a symmetrical pair of proof masses and double-ended tuning fork(DETF) oscillators. Under the external acceleration along the input axis, the proof mass applies forces to the oscillators, which causes a change in their resonant frequency. This frequency change is measured to indicate the applied acceleration. Pivot anchor and leverage mechanisms are adopted in the accelerometer to generate larger force from a proof mass under certain acceleration, which enables increasing its scale factor. Finite element method analyses have been conducted to design the accelerometer and a silicon on insulator(SOI) wafer with a substrate glass wafer was used for fabricating it. The fabricated accelerometer has a scale factor of 188 Hz/g, which is shown to be in agreement with analysis results.
A Cantilever Type Contact Force Sensor Array for Blood Pressure Measurement
Lee, Byeung-Leul ; Jung, Jin-Woo ; Chun, Kuk-Jin ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 121~126
DOI : 10.5369/JSST.2012.21.2.121
Piezoresistive type contact force sensor array is fabricated by (111) Silicon bulk micromachining for continuous blood pressure monitoring. Length and width of the unit sensor structure is
, respectively. The gap between sensing elements is only
. To achieve wafer level packaging, the sensor structure is capped by PDMS soft cap using wafer molding and bonding process with
alignment precision. The resistance change over contact force was measured to verify the feasibility of the proposed sensor scheme. The maximum measurement range and resolution is 900 mm Hg and 0.57 mm Hg, respectively.
Development of Force Sensors for Rectangular-Type Finger-Rehabilitation Robot Instruments and Their Characteristic Test
Kim, Gab-Soon ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 127~134
DOI : 10.5369/JSST.2012.21.2.127
Stroke patients must do the rehabilitation exercise to recover their fingers' function using a rehabilitation robot. But the rehabilitation robots mostly have not the force sensors to control the applied force to each finger. Thus, in this paper, the development of a force sensor for thumb rehabilitation robot and four two-axis force sensors for four-finger rehabilitation robot were developed. The force sensor and four two-axis force sensors could be used to measure the applied force to each finger, and the forces could be used to control the applied forces to each sensor in rehabilitation exercise using in the rehabilitation robot. The developed sensors have non-linearlity error of less than 0.05 %, repeatability error of less than 0.03 %, and the interference error of two-axis force sensor is less than 0.2 %.
Fabrication and Evaluation of Sensor for Measuring Pulse Wave Velocity using Piezo Film and Conductive Textile
Kim, Jung-Chae ; Jee, Sun-Ha ; Yoo, Sun-Kook ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 135~143
DOI : 10.5369/JSST.2012.21.2.135
Arterial stiffness is causing the serious problems for human who is suffered from hypertension and metabolic syndrome. So it is important that measure the arterial stiffness for early prevention. Many researches point out that pulse wave velocity(PWV) is the reliable and simple method to predict arterial stiffness. In this paper, we developed the sensing parts that detect the pulse wave and ECG by using piezoelectric film and conductive textile with elastic band. Our system could detect 3ch pulse wave and ECG. Simultaneously, our algorithm extracts the features for calculating the delays among pulse waves. The delays are the significant parameter to estimate PWV, thus we design the experiment for evaluating the performance of our sensing parts. The reference is PP-1000(HanByul Meditech, Korea) that is good for performance evaluation. As a result, the start point of the pulse wave was the most reliable feature for comparing with PP-1000(r=0.691, P=0.00). The results between two operators showed that there is only a slight difference in the reproducibility of the devices. In conclusion, we assume that the suggested sensor could be more comfortable and faithful method for arterial stiffness.
The Design of Temporal Bone Type Implantable Microphone for Reduction of the Vibrational Noise due to Masticatory Movement
Woo, Seong-Tak ; Jung, Eui-Sung ; Lim, Hyung-Gyu ; Lee, Yun-Jung ; Seong, Ki-Woong ; Lee, Jyung-Hyun ; Cho, Jin-Ho ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 144~150
DOI : 10.5369/JSST.2012.21.2.144
A microphone for fully implantable hearing device was generally implanted under the skin of the temporal bone. So, the implanted microphone's characteristics can be affected by the accompanying noise due to masticatory movement. In this paper, the implantable microphone with 2-channels structure was designed for reduction of the generated noise signal by masticatory movement. And an experimental model for generation of the noise by masticatory movement was developed with considering the characteristics of human temporal bone and skin. Using the model, the speech signal by a speaker and the artificial noise by a vibrator were supplied simultaneously into the experimental model, the electrical signals were measured at the proposed microphone. The collected signals were processed using a general adaptive filter with least mean square(LMS) algorithm. To confirm performance of the proposed methods, the correlation coefficient and the signal to noise ratio(SNR) before and after the signal processing were calculated. Finally, the results were compared each other.
Liquid Refractive Index Sensor Based on Cladded Plastic Optical Fiber Taper
Kim, Kwang-Taek ; Kim, Hoe-Man ; Yun, Jung-Hyun ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 151~155
DOI : 10.5369/JSST.2012.21.2.151
We have investigated a refractive index sensor based on a cladded plastic optical fiber taper. The optical transmission and sensing characteristics of the device were illuminated in terms of ray optics. The sensor devices showed that the optical transmittance strongly depends on the refractive index of the external medium surrounding the tapered region.
A Study on Gel-free Probe for Detecting EEG
Yun, Dae-Jhoong ; Eum, Nyeon-Sik ; Jeong, Myung-Yung ;
Journal of Sensor Science and Technology , volume 21, issue 2, 2012, Pages 156~166
DOI : 10.5369/JSST.2012.21.2.156
Over the past 15 years productive BCI research programs have arisen. Current mainstream EEG electrode setups permit efficient recordings but most of electrodes has the disadventages of need for skin preparation and gel application to correctly record signals. The new gel-free probe was adapted for EEG recording and it can be fixed to the scalp with the micro needle without neuro-gel. It use standard EEG cap for wearing electrodes on scalp so it is compatible with standard EEG electrodes. A comparison between electrode characteristics is achieved by performing simultaneous recordings with the gel electrodes and gel-free probe placed in parallel scalp positions on the same anatomical regions. The quality of EEG recordings for all two types of experimental conditions is similar for gel-electrodes and gel-free probe. Subjects also reported not having special tactile sensations associated with wearing of gel-free probes. According to our results, it is expected that gel-free probe can be adapted to BCI, BMI(Brain Machine Interface), HMI(Human Machine Interface) because of its simple application and comfortable wearing process.