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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 14, Issue 6 - Nov 2005
Volume 14, Issue 5 - Sep 2005
Volume 14, Issue 4 - Jul 2005
Volume 14, Issue 3 - May 2005
Volume 14, Issue 2 - Mar 2005
Volume 14, Issue 1 - Jan 2005
Selecting the target year
A micromachined cantilever for chemically sensitive scanning force microscope applications
Lee, Dong-Weon ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 1~6
DOI : 10.5369/JSST.2005.14.1.001
This paper describes a novel concept of a chemically sensitive scanning force microscope (CS-SFM). It consists of the conventional SFM and the time-of-flight mass spectrometer (TOF-MS). A switchable cantilever (SC) fabricated by the micromachining technology combines each advantage of two completely different systems, SFM and TOF-MS. The CS-SFM offers to produce both images of topography and chemical information simultaneously. First we employed a rotatable tip holder based on 4 piezotube actuators for demonstration of the possibility of the CS-SFM concept. Second the CS-SFM concept is optimized with the micromachining technology. The micromachined SC with an integrated bimorph actuator and a piezoresistive strain sensor provides a reasonable switching speed of
ms which is very attractive for the CS-SFM application. The SC is currently being integrated in an ultra-high-vacuum system to perform various experiments.
Implementation and estimation of the urophonography measurement system for diagnosis of Lower urinary tract symptom
Jeong, Do-Un ; Cho, Seong-Taek ; Jeon, Gye-Rok ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 7~15
DOI : 10.5369/JSST.2005.14.1.007
A sensor and measuring system were implemented to measure both uroflow and urophonography signal during urination for diagnose the lower urinary tract symptom. The implemented system was composed of the uroflow sensor using the load-cell, the urophonography measurement sensor so as stethoscope type, pre-processing part for sensors signal detection, amplifier and filter, system control parts and PC measurement program. A simulator of the lower urinary system that is experimental equipment implemented for evaluate the developed system. The two signals were measured using implemented system and analyzed these signal by means of time domain and frequency domain for extraction of the characteristic parameter which can most effectively reflected by the occlusion of the lower urinary system. Furthermore two signals were measured and analyzed with the subject of 5 healthy adult for clinical application possibility of the implemented system. As a result, the most influence bandwidth of effect according to occlusion of the lower urinary system is
Hz of the urophonography signal.
A study on the optical switch using magnetic behavior of magnetic fluids
Choi, Bum-Kyoo ; Oh, Jae-Geun ; Kim, Do-Hyung ; Song, Kwan-Min ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 16~21
DOI : 10.5369/JSST.2005.14.1.016
This paper presents the development of the optical switch using magnetic behavior of magnetic fluids, which is expected to be used broadly in high-speed information communication. The magnetic fluids for switching an incident light, have the magnetic characteristics of magnetic materials and fluidity of liquids, simultaneously. The relations are derived between the intensity of magnetic field and the angle of optical fiber which is bent by a behavior of magnetic fluid when the magnetic field is applied. When optical switch is implemented by the movement of liquid using magnetic fluid, the existing problem of durability for optical switch will be improved. Thus, this study shows the feasibility of the application for the optical switches using magnetic fluids.
Fabrication and characteristics of micro-machined thermoelectric flow sensor
Lee, Young-Hwa ; Roh, Sung-Cheoul ; Na, Pil-Sun ; Kim, Kook-Jin ; Lee, Kwang-Chul ; Choi, Yong-Moon ; Park, Se-Il ; Ihm, Young-Eon ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 22~27
DOI : 10.5369/JSST.2005.14.1.022
A thermoelectric flow sensor for small quantity of gas flow rate was fabricated using silicon wafer semiconductor process and bulk micromachining technology. Evanohm R alloy heater and chromel-constantan thermocouples were used as a generation heat unit and sensing parts, respectively. The heater and thermocouples are thermally isolated on the
laminated membrane. The characteristics of this sensor were observed in the flow rate range from 0.2 slm to 1.0 slm and the heater power from 0.72 mW to 5.63 mW. The results showed that the sensitivities
: voltage difference,
: flow rate) were increased in accordance with heater power rise and decreasing of flow rate.
A CMOS integrated circuit design of charge-sharing scheme for a capacitive fingerprint sensor
Nam, Jin-Moon ; Lee, Moon-Key ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 28~32
DOI : 10.5369/JSST.2005.14.1.028
In this paper, a CMOS integrated detection circuit for capacitive type fingerprint sensor signal processing is described. We designed a detection circuit of charge-sharing sensing scheme. The proposed detection circuit increases the voltage difference between a ridge and valley. The test chip is composed of
array sensing cells (12 by
). The chip was fabricated on a 0.35 m standard CMOS process. Measured difference voltage between a ridge and valley was 0.95 V.
Development of PC-based and portable high speed impedance analyzer for biosensor
Kim, Gi-Ryon ; Kim, Gwang-Nyeon ; Heo, Seung-Deok ; Lee, Seung-Hoon ; Choi, Byeong-Cheol ; Kim, Cheol-Han ; Jeon, Gye-Rok ; Jung, Dong-Keun ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 33~41
DOI : 10.5369/JSST.2005.14.1.033
For more convenient electrode-electrolyte interface impedance analysis in biosensor, a stand-alone impedance measurement system is required. In our study, we developed a PC-based portable system to analyze impedance of the electrochemical cell using microprocessor. The devised system consists of signal generator, programmable amplifiers, A/D converter, low pass filter, potentiostat, I/V converter, microprocessor, and PC interface. As a microprocessor, PIC16F877 which has the processing speed of 5 MIPS was used. For data acquisition, the sampling rate at 40 k samples/sec, resolution of 12 bit is used. RS-232 with 115.2 kbps speed is used for the PC communication. The square wave was used as stimuli signal for impedance analysis and voltage-controlled current measurement method of three-electrode-method were adopted. Acquired voltage and current data are calculated to multifrequency impedance signal after Fourier transform. To evaluate the implemented system, we set up the dummy cell as equivalent circuit of which was composed of resistor, parallel circuit of capacitor and resistor connected in parallel and measured the impedance of the dummy cell; the result showed that there exist accuracy within 5 % errors and reproduction within 1 % errors compared to output of Hioki LCR tester and HP impedance analyzer as a standard product. These results imply that it is possible to analyze electrode-electrolyte interface impedance quantitatively in biosensor and to implement the more portable high speed impedance analysis system compared to existing systems.
The jitter and phase noise caused by 1/f noise of MOSFET in 2.75 GHz CMOS ring oscillator
Park, Se-Hoon ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 42~46
DOI : 10.5369/JSST.2005.14.1.042
It has been known that 1/f noise of MOSFET is generated by superposition of random telelgraph signals (RTS). In this study, jitters and phase noise caused by 1/f noise of MOSFET are analysed with RTS supplied to all of the nodes of the CMOS ring oscillator under investigation. Through the analysis of jitters and jitter ratios with varying values of the amplitude of RTS, it is found that the jitters and the jitter ratios are proportional to the amplitude of RTS. And the analysis of FFT of the output of the ring oscillator reveals that the jitters are closely related to the phase noise of the high order harmonics of the ring oscillator outputs.
Visualization for the mixing state of a batch-type ultrasonic mixer for its application to the microdevice
Heo, Pil-Woo ; Yoon, Eui-Soo ; Koh, Kwang-Sik ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 47~51
DOI : 10.5369/JSST.2005.14.1.047
-mixer is important in Bio-MEMS and
-TAS. The mixing state depends on some kinds of factors including the intensity of ultrasonic radiation. We have visualized the mixing state of the mixing chamber with radiation time and presented the influence of the driving voltage in this research. It will be possible to compare the performances of the ultrasonic radiation parts used in the active
-mixer using this method.
Formation of nickel oxide thin film and analysis of its electrical properties
Noh, Sang-Soo ; Seo, Jeong-Hwan ; Lee, Eung-Ahn ; Lee, Seon-Gil ; Park, Yong-Joon ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 52~55
DOI : 10.5369/JSST.2005.14.1.052
Ni oxide thin films with thermal sensitivity superior to Pt and Ni thin films were formed through annealing treatment after Ni thin films were deposited by a r.f. magnetron sputtering method. Resistivity values of Ni oxide thin films were in the range of
according to the degree of Ni oxidation. Also temperature coefficient of resistance(TCR) values of Ni oxide thin films depended on the degree of Ni oxidation from 2,188 ppm/
to 5,630 ppm/
in the temperature range of
. Because of the high linear TCR and resistivity characteristics, Ni oxide thin films exhibit much higher sensitivity to flow and temperature changes than pure Ni thin films and Pt thin films.
Characteristics of chromium oxide thin-films for high temperature piezoresistive sensors
Seo, Jeong-Hwan ; Noh, Sang-Soo ; Lee, Eung-Ahn ; Chung, Gwiy-Sang ; Kim, Kwang-Ho ;
Journal of Sensor Science and Technology , volume 14, issue 1, 2005, Pages 56~61
DOI : 10.5369/JSST.2005.14.1.056
This paper present characteristics of chromium oxide thin-film as piezoresistive sensors, which were deposited on Si substrates by DC reactive magnetron sputtering in an argon-Oxide atmosphere for high temperature applications. The chemical composition, physical and electrical properties and thermal stability ranges of the
sensing elements have studied.
thin films with a linear gauge factor(GF
15), high electrical resistivity (
) and TCR<-55 ppm/
have been obtained. These
thin films may allow high temperature pressure sensor miniaturization to be achieved.