• 제목/요약/키워드: Sensor Sensitivity

검색결과 1,892건 처리시간 0.031초

Candida sp. LSY2 중금속 내성주를 이용한 BOD 분석 (BOD Determination by Heavy Metal Tolerant Candida sp. LSY2)

  • 김말남;이선영
    • 환경생물
    • /
    • 제17권4호
    • /
    • pp.415-420
    • /
    • 1999
  • 용존 유기물의 농도를 BOD로 신속히 측정하여 폐수 처리 공정에 feed back할 수 있는 Candida BOD sensor를 이용하여 BOD를 측정하였다. Glucose, acetic acid, aspartic acid 및 glutamic acid에 대한 sensitivity는 lactose, sucrose및 lactic acid의 sensitivity보다 더 높게 나타나서 오염물질의 종류에 따라 BOD sensor의 출력 신호가 다르게 제시되었다.$Zn^{2+}$내성주가 충전된 BOD sensor는 중금속 비내성주의 경우와 유사한 정도의 감응도를 나타내었으나 $Cd^{2+}$ 내성주를 사용하였을 때는 매우 낮은 sensitivity를 보였다. 수용액의 $Cd^{2+}$의 농도가 증가함에 따라 중금속 비내성주와 $Zn^{2+}$ 내성주의 sensor 의 sensitivity는 거의 일정하였으나 $Cd^{2+}$ 내성주의 BOD sensor의 경우에는 sensitivity가 오히려 감소하였다. 반면 수용액 중의 $Zn^{2+}$ 의 농도가 증가함에 따라서는 중금속 비내성주, $Zn^{2+}$ 내성주 및 $Cd^{2+}$ 내 성주 모두 거의 동일한 감응도를 나타내었다.

  • PDF

The thermal effect on electrical capacitance sensor for two-phase flow monitoring

  • Altabey, Wael A.
    • Structural Monitoring and Maintenance
    • /
    • 제3권4호
    • /
    • pp.335-347
    • /
    • 2016
  • One of major errors in flow rate measurement for two-phase flow using an Electrical Capacitance Sensor (ECS) concerns sensor sensitivity under temperature raise. The thermal effect on electrical capacitance sensor (ECS) system for air-water two-phase flow monitoring include sensor sensitivity, capacitance measurements, capacitance change and node potential distribution is reported in this paper. The rules of 12-electrode sensor parameters such as capacitance, capacitance change, and change rate of capacitance and sensitivity map the basis of Air-water two-phase flow permittivity distribution and temperature raise are discussed by ANSYS and MATLAB, which are combined to simulate sensor characteristic. The cross-sectional void fraction as a function of temperature is determined from the scripting capabilities in ANSYS simulation. The results show that the temperature raise had a detrimental effect on the electrodes sensitivity and sensitive domain of electrodes. The FE results are in excellent agreement with an experimental result available in the literature, thus validating the accuracy and reliability of the proposed flow rate measurement system.

유도형 변위 센서의 민감도 향상을 위한 형상 최적 설계 (Shape Design Optimization of Inductive Position Sensor to Improve Sensitivity)

  • 홍준희;이동주;신우철
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
    • /
    • pp.250-254
    • /
    • 2001
  • The resolution of analog sensor is determined by its sensitivity and amplitude of noise. This paper presents modeling of inductive gap sensor base on equivalent magnetic circuit and analysis of sensitivity. We can simulate static characteristic of inductive gap sensor using this model. Computer simulation show that sensor's sensitivity is affected by magnetic flux's leakage and fringing, and that they are affected by shape of sensor probe. Base on this, we designed shape of inductive position sensor probe.

  • PDF

민감도 향상과 센서 소형화를 위한 자기 및 용량형 안압센서의 개발 (Development of Inductive and Capacitive Type Intraocular Pressure (IOP) Sensor to Improve Sensitivity and Minimize Size)

  • 장철인;신경식;윤광석;김용우;강지윤;이수현
    • 센서학회지
    • /
    • 제23권6호
    • /
    • pp.409-415
    • /
    • 2014
  • We had presented an inductive type intraocular pressure sensor (L-sensor) in previous work. The distance between a micro coil and a ferrite on the membrane was modulated by pressure, and as a result the inductance and resonant frequency were changed. However, L-sensor has some problems to implant in eyes. First problem is low sensitivity. When L-sensor was implanted in rabbit's eyes, resonant frequency of L-sensor was very hard to detect. Second problem is biocompatibility. Size of L-sensor is $6{\times}7{\times}1.2mm$. When L-sensor was implanted in the eyes, it caused the inflammation. Therefore, this study suggests an inductive and capacitive type IOP sensor (LCsensor). The sensitivity of the LC-sensor 27.3 kHz/mmHg under 60mmHg. It is much larger than 14 kHz/mmHg of the L-sensor. And the size of LC-sensor is 47% smaller than L-sensor. After 2 weeks from the implantation of LC-sensor into rabbit eyes, we measured the changes of resonant frequency of LC-sensor according to increased IOP by Balanced Salt Solution (BSS) injection. As a result, the sensitivity of LC-sensor in in vivo test is 25 kHz/mmHg. That is similar to the sensitivity of in vitro test.

민감도 해석을 이용한 센서의 최적 위치 선정에 관한 연구 (A Study on Optimal Sensor Placement Using Sensitivity Analysis)

  • 손인수;이두호
    • 한국소음진동공학회논문집
    • /
    • 제21권3호
    • /
    • pp.241-247
    • /
    • 2011
  • Although intensive development continues on innovative sensor systems, there is still considerable uncertainty in deciding on the number of sensors required and their locations in order to obtain adequate information on structural behavior. This paper is concerned with the sensor locations on a beam-structure for prognostic structural health monitoring. The purpose of this study is to investigate how to determine optimal sensor placement(OSP) from the sensitivity information of a known failure mode. The sensitivity of the forced vibration response of a beam to the variation of stiffness due to a crack is calculated analytically and used to determine the optimal sensor locations for the specified failure mode. The results of this method compared with the results of different OSP methods. The results have shown that the proposed method on optimal sensor placement is very effective in structural health monitoring.

정전용량방식 토크센서의 출력특성과 감도해석 (Output Characteristics and Sensitivity Analysis of Capacitive Type Torque Sensor)

  • 이신표;김종보
    • 대한기계학회논문집A
    • /
    • 제26권12호
    • /
    • pp.2590-2597
    • /
    • 2002
  • A new torque measuring apparatus adopting the basic principle of a capacitive type sensor is proposed in this article. Two plate electrodes are working as a capacitive sensor, whose capacitance varies as torque is applied. One end of each plate is connected to the torque carrying shaft. Output characteristics of the torque sensor were theoretically analyzed and its validity was investigated through experiment. Calculations and calibration experiments show that the output is nonlinear, that is, the sensitivity is very high at low torque but decreases as torque increases. The sensitivity of the proposed system is about 100 times roughly higher than that of a conventional 4-strain gauge type torque sensor.

Implementation of an Integrated Pressure-sensor System Adapted to the Optimum Sensitivity

  • Hong, Sung-Hee;Cho, Chun-Hyung
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • 제17권2호
    • /
    • pp.186-191
    • /
    • 2017
  • An integrated pressure-sensor system was developed using the sensor-conditioning processes, which resulted in the optimum sensitivity of the pressure-sensor through the signal amplification, noise reduction, and level shift. Due to the specified characteristics among the components, such as operation range, the sensor output was generally limited compared to the full scale of the reading when coupled with other parts. Devices fabricated exhibited comparable characteristics with higher pressure sensitivity to that of the pressure sensor without sensor-conditioning process. In this work, the sensor resolution was at least enhanced at least by 25% using the sensor-conditioning processes.

측정대상물의 표면조도에 따른 광파이버 센서 특성고찰 (The Characteristics of Fiber Optic Sensor on the Surface Roughness of Target)

  • 박한수;정택구;홍준희;이동주
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2002년도 춘계학술대회 논문집
    • /
    • pp.283-286
    • /
    • 2002
  • In fiber optic sensor, the error of the measurement is influenced by the surface roughness of the target and surroundings, especially the outside light. To reduce or modify this error, the sensitivity of the fiber optic sensor and the noise change by the surface roughness of the target should be known. The purpose of this paper is to observe the sensitivity of the fiber optic sensor and the noise according to the surface roughness of the target.

  • PDF

A PDMS-Coated Optical Fiber Bragg Grating Sensor for Enhancing Temperature Sensitivity

  • Park, Chang-Sub;Joo, Kyung-Il;Kang, Shin-Won;Kim, Hak-Rin
    • Journal of the Optical Society of Korea
    • /
    • 제15권4호
    • /
    • pp.329-334
    • /
    • 2011
  • We proposed a poly-dimethylsiloxane (PDMS)-coated fiber Bragg grating (FBG) temperature sensor for enhancing temperature sensitivity. By embedding the bare FBG in a temperature-sensitive elastomeric polymer, the temperature sensitivity of the proposed structure could be effectively improved by 4.2 times higher than those of the conventional bare-type FBG sensors due to the high thermal expansion coefficient of the PDMS. We analyzed the temperature-sensitivity enhancement effect with the increased Bragg wavelength shift in our structure and dependence on the temperature sensitivity with respect to the cross-section area of the PDMS.

An ITO/Au/ITO Thin Film Gas Sensor for Methanol Detection at Room Temperature

  • Jeong, Cheol-Woo;Shin, Chang-Ho;Kim, Dae-Il;Chae, Joo-Hyun;Kim, Yu-Sung
    • Transactions on Electrical and Electronic Materials
    • /
    • 제11권2호
    • /
    • pp.77-80
    • /
    • 2010
  • Indium tin oxide (ITO) films with a 5 nm thick Au interlayer were prepared on glass substrates. The effects of the Au interlayer on the gas sensitivity for detecting methanol vapors were investigated at room temperature. The conductivity of the film sensor increased upon exposure to methanol vapor and the sensitivity also increased proportionally with the methanol vapor concentration. In terms of the sensitivity measurements, the ITO film sensor with an Au interlayer shows a higher sensitivity than that of the conventional ITO film sensor. This approach is promising in gaining improvement in the performance of ITO gas sensors used for the detection of methanol vapor at room temperature.