• Title/Summary/Keyword: Sensor-type Measurement Technology

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Analysis of Surface Profile using Gap Sensor (Gap 센서를 이용한 가공물의 표면특성 분석)

  • 송무건;유송민
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.10a
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    • pp.304-308
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    • 2000
  • Surface roughness measurement system with capacitance type gap sensor. Tentative result from the calibration measurement showed the potential applicability of the sensor to the processed specimen. In order to test the sensitivity of the measurement system, several parameters including valley depth, width of the specimen have been changed. Effect of the charge area between sensor and specimen surface has been also analyzed.

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Signal Analysis According to the Position of the ECG Sensor Electrode in Healthcare Backpack (헬스케어 가방의 ECG 센서 전극 위치에 따른 신호 분석)

  • Lee, Hyeon-Seok;Chung, Wan-Young
    • Journal of Sensor Science and Technology
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    • v.23 no.6
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    • pp.402-408
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    • 2014
  • Heart rate is one of the most important signal to monitor the health condition of the patient or exerciser. Various wearable devices have been developed for the continuous monitoring of ECG signal from human body during exercise. Among these, ECG chest belt has been widely used. However wearing chest belt with ECG sensor is uncomfortable in normal life due to the electrode contact between metal electrodes of ECG sensor and skin of the human body. So we develop the royal healthcare backpack that can measure ECG signal without skin contact by using capacitor-type ECG sensor. The position of the measurement point is critical to collect a clear ECG signal in the capacitive ECG measurement from backpack. Various tests were conducted to find the optimal ECG measurement position which has less noise and could get strong and clear ECG signal during exercise, walking, hiking, mountain climbing and cycling.

A Cantilever Type Contact Force Sensor Array for Blood Pressure Measurement (혈압 측정을 위한 외팔보형 접촉힘 센서 어레이)

  • Lee, Byeung-Leul;Jung, Jin-Woo;Chun, Kuk-Jin
    • Journal of Sensor Science and Technology
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    • v.21 no.2
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    • pp.121-126
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    • 2012
  • 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 $200{\mu}m$ and $190{\mu}m$, respectively. The gap between sensing elements is only $10{\mu}m$. To achieve wafer level packaging, the sensor structure is capped by PDMS soft cap using wafer molding and bonding process with $10{\mu}m$ 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.

A multiplexed fiber-optic sensor for measuring large displacement (대변위 측정을 위한 다중화된 광섬유 센서)

  • Yoo, Jung-Ae;Kwon, Il-Bum;Jo, Jae-Heung;Seo, Dae-Cheol
    • Journal of Sensor Science and Technology
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    • v.14 no.3
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    • pp.169-179
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    • 2005
  • A multiplexed bend loss type single-mode fiber-optic sensor system was prepared to measure the displacement of several cm of the civil engineering structures such as many bridges, tunnels and various buildings. This bend loss type fiber-optic sensor used the signal difference between two reflection signals due to various bend losses generating at a pair of optical connectors by using OTDR (optical time domain reflectometer) for measuring displacements. And the experiments were conducted for showing the measurement feasibility on the range of 10 cm, and the multiplexing experiments were also performed to measure the displacements of 5 measuring positions of an object by setting these 5 fiber-optic sensors on a single mode fiber simultaneously.

Strain and Temperature Measurement using Transmission-type EFPI Optical Fiber Sensors (투과형 EFPI 광섬유 센서를 이용한 변형률 및 온도의 측정)

  • Kim, Sang-Hoon;Lee, Jung-Ju;Huh, Jeung-Soo
    • Journal of Sensor Science and Technology
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    • v.10 no.1
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    • pp.9-15
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    • 2001
  • The extrinsic Fabry-Perot interferometric (EFPI) optical fiber sensor shows good sensitivity and resolution, and has many advantages over optical fiber sensors of other types. However, this EFPI optical fiber sensor has a disadvantage that the distinction of measuring directions is difficult due to the measurement method by using only fringe counting. In this paper, the transmission-type extrinsic Fabry-Perot interferometric (TEFPI) optical fiber sensor was developed, which has been improved by the additional function and whose measuring system is different from that of the conventional EFPI optical fiber sensor. Then the application result of the TEFPI optical fiber sensor to the strain and temperature measurement was explained in detail.

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Application of Dielectric Sensor for Soil Moisture Measurement (토양 수분 측정을 위한 유전율식 쎈서 연구)

  • Oh, Yong-Taeg;Oh, Dong-Shig;Song, Kwan-Cheol;Shin, Jae-Sung;Im, Jung-Nam
    • Korean Journal of Soil Science and Fertilizer
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    • v.31 no.2
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    • pp.85-94
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    • 1998
  • Due to relatively high permittivity of water in soils, we placed the soil condenser into soils to measure the soil moisture content. The soil condenser was made with two insulated iron sticks. The capacitance of the soil condenser was determined by the pulse period from RC type oscillation circuit and the highest voltage output accepting 10MHz pulse. After zero point adjustment, the measured relative capacitance percentage (RCS) to the standard condenser obtained by the oscillation circuit almost linearly correlated with the end depth of the sensor submerged in water. The RC type oscillation was disturbed by many sensor installed in a close distance in one place, presumably resulting in that the sensor sticks played as a interfering antennas generating or accepting electron waves from them. The temperature dependance of the output from the sensors could be corrected through experimentally determined revision function. Although lineal correlation was found between soil moisture and RCS, users should derive their own correlation function for every sensor to measure soil moisture, because the outputs were influenced by the installation depth and layout in the soil. The voltage type sensor responded inversely with soil moisture content and so was not suitable to the accurate measurement of soil moisture, but allows high economic benefit in various application such as simplified measurement of soil moisture and irrigation line control because of its low component count. The voltage type moisture sensor could be reinforced by relay controlling circuit to open and to close the solenoid valves respectively at optimal limits of the least and the most soil moisture according to user's adjustment.

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Optimum Design of 3-Axis Sensor System for Vibration Measurement Using Piezoresistive type MEMS Sensor (압전저항형 멤스센서를 이용한 진동 측정용 3축 센서 시스템의 최적화 설계)

  • Seo, Sang-Yoon;Bae, Dong-Myung;Lee, Jong-Kyu;Choi, Byeong-Keun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.12
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    • pp.1082-1089
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    • 2013
  • 3-Axis sensor measurement system is needed for measuring ride quality of elevator. But because 3-Axis piezoelectric accelerometer is expensive. We developed 3-Axis sensor system which is suitable for measuring ride quality of elevator using cheap MEMS sensor. There are two types of MEMS sensor that are piezoresistive and capacitive type. The excellence of piezoresistive type in characteristic of frequency response and noise is confirmed compare to capacitive type as a result of this paper's experiment and reference. 3-Axis system using MEMS sensor needs MEMS's proper frequency response characteristic. Additionally noise characteristic of sensor and circuit, stiffness of assembly are needed for deciding frequency range and accuracy of amplitude.

The Micro Electromagnetic Force Measurement of Voice-coil Actuator using Semiconductor Piezoresistive Type Vibration Sensor (실리콘 압저항형 진동 센서를 이용한 Voice-coil형 구동기의 미소 전자력 측정)

  • Gwon, Gi-Jin;Lee, Gi-Chan;Park, Se-Gwang
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.2
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    • pp.147-152
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    • 1999
  • Semiconductor piezoresistive type vibration sensor was fabricated by using semiconductor process and micromachining technology. To measure the micro electromagnetic force between coil and magnet, fabricated vibration sensor was used. Toapply micro electromagnetic force produced from the micro exciter, small-sized NdFeB permanent magnet was attached on the mass of the fabricated vibration sensor. The measured electromagnetic force are about 5~180dyne when the applied sinusoidal current of 1KHz in the range of 1.5~8mA. The measurement of micro electromagnetic forcewas performed by changing the distance between coil and magnet. Output characteristics of micro electromagnetic force according to the applied coil current were linear. Furthermore, output results were used to get the transfer constant that is important to decide the efficiency and the performance of the coil and magnet.

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A Study on the UHF PD Sensor and Novel Pattern Analysis Technology for Diagnosis of the High Power Apparatus (초고압 전력기기 진단을 위한 UHF PD 센서 및 패턴분석 기술에 관한 연구)

  • 강원종;이창준;강윤식;이희철;박종화
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.2
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    • pp.83-90
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    • 2004
  • This paper describes investigations of the UHF(Ultra High Frequency) PD(Partial Discharge) measuring technology designed for monitoring of PD in high power apparatus. Based on the spiral antenna theory, the hole type sensor for GIS with metal flange spacer and injection type sensor for oil filled transformer are developed. The experimental results show measurement characteristics of the PD sensor for several artificial defects in gas-insulated system(GIS) and oil transformer. Moreover, we proposed the new $\phi$-f-q method for the purpose of condition assessment of high power apparatus.

The Analysis in Measurement Performance MEMS Sensor Through the Low-Noise Vibration Measurement APP (저노이즈형 진동계측 앱을 통한 MEMS 센서의 계측성능분석)

  • Jung, Young-Seok;Yoon, Sung-Won
    • Journal of Korean Association for Spatial Structures
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    • v.17 no.1
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    • pp.93-100
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    • 2017
  • With increasing number construction of high-rise building which has about 40 to 60 floors there have been many kinds of problem which related with usage from vibration. To predict response acceleration, it is important to assess correct natural frequency. However, due to the noise of MEMS sensor, it is difficult to measure dynamic characteristic such as natural frequency when measuring ambient vibration using MEMS sensor within cell phone. Therefore, a comparative analysis on vibration measuring applications was performed after measuring ambient vibration of 2 skyscrappers which have height between 133.5~244.3m that are located in Seoul and Observation tower using I-jishin APP with noise reduction function of MEMS sensor in order to verify the effectiveness of low noise type vibration measurement APP.