• Title/Summary/Keyword: Temperature measurement

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Accuracy Improvement of Digital Measurement System by Modified Piecewise Measuring Functions (개선 구산 계측함수에 의한 디지털 계측시스템의 정밀도 향상)

  • Hong, Sung-Hun;Kang, Moon-Sung
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.2
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    • pp.138-145
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    • 2001
  • Measurement errors in a digital measurement systems are mainly due to the consisting elements accuracies and the circuit parameters changes following the environment variations such as temperature. Further, systems non-linearity makes the measurement accuracy worse, and accordingly a linearization method should be considered to avoid this worsening. In this study, a temperature error-correction method and linearization methods are proposed and a digital temperature measurement system utilizing these methods is realized. And the proposed measurement methods are observed to increase the measurement accuracy of the digital measurement system.

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Development of Automatic Measurement of Body Temperature by Taking the Temperature of Milk while Milking in Dairy Cattle (젖소에서 유즙체온 측정을 이용한 체온 자동 측정 방법의 개발)

  • 김용준;한종현;이수영;한병성;김동원
    • Journal of Veterinary Clinics
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    • v.19 no.1
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    • pp.37-42
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    • 2002
  • To develop an automatic detecting system of body temperature of dairy cattle while milking, measurement of the temperature of mammary skin using three thermometers attached into the lining of teat cup was carried out for 23 dairy cattle, whereas measurement of the temperature of milk while milking was also performed for 263 animals. For the latter experiment, three thermometers were attached at 10cm(left and right) and 20 cm away from an individual milk collector on the milk transporting hose. Taking the rectal temperature was accompanied all the time for the experiments. The measurement of the temperature of mammary skin using teat cup was successful for 11 of 23 dairy cattle(47.8%) and the mean temperature was $33.5^{\circ}C$ with the mean difference of $5.2^{\circ}C$ from the mean rectal temperature. The measurement of the temperature of milk using the thermometers onto the milk transporting hose while milking was very successful , From 37.3 to $38.4^{\circ}C$ of rectal temperature, the temperature of milk was almost the same and from 38.5 to $39.5^{\circ}C$ of rectal temperature, the temperature of milk tended to be low with the difference of 0.1$^{\circ}C$. From 39.6 to $41^{\circ}C$ of rectal temperature, the temperature of milk tended to be low with the difference of $0.2-0.6^{\circ}C$. These results indicated that automatic detection of body temperature whether low or high can be possible if the temperature of milk is taken while milking and if it is connected to the integration system by on-line.

Surface Temperature Measurement in Microscale with Temperature Sensitive Fluorescence (온도 민감 형광을 이용한 마이크로 스케일 표면온도 측정)

  • Jung Woonseop;Kim Sungwook;Kim Ho-Young;Yoo Jung Yul
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.30 no.2 s.245
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    • pp.153-160
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    • 2006
  • A technique for measuring surface temperature field in micro scale is newly proposed, which uses temperature-sensitive fluorescent (TSF) dye coated on the surface and is easily implemented with a fluorescence microscope and a CCD camera. The TSF dye is chosen among mixtures of various chemical compositions including rhodamine B as the fluorescent dye to be most sensitive to temperature change. In order to examine the effectiveness of this temperature measurement technique, numerical analysis and experiment on transient conduction heat transfer for two different substrate materials, i. e., silicon and glass, are performed. In the experiment, to accurately measure the temperature with high resolution temperature calibration curves were obtained with very fine spatial units. The experimental results agree qualitatively well with the numerical data in the silicon and glass substrate cases so that the present temperature measurement method proves to be quite reliable. In addition, it is noteworthy that the glass substrate is more appropriate to be used as thermally-insulating locally-heating heater in micro thermal devices. This fact is identified in the temperature measuring experiment on the locally-heating heaters made on the wafer of silicon and glass substrates. Accordingly, this technique is capable of accurate and non-intrusive high-resolution measurement of temperature field in microscale.

Temperature measurement of the spray flame using micro scale absorption bands and line strength (마이크로 스케일의 흡수선과 흡수강도를 이용한 분무화염의 온도측정)

  • Choi, G.M.
    • Journal of ILASS-Korea
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    • v.7 no.2
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    • pp.1-6
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    • 2002
  • It is necessary to develope a high frequency diode laser sensor system based on the absorption spectroscopy for the measurement of temperature of the spray flame. DFB diode laser operating near $2.0{\mu}m$ was used to scan over selected $H_2O$ transitions near $1.9{\mu}m\;and\;2.2{\mu}m$, respectively. The measurement sensitivity at wide range of sweep frequency was evaluated using multi-pass cell containing $CO_2$ gas. This diode laser absorption sensor with high temporal resolution up to 10kHz was applied to measure the gas temperature in the spray flame region of liquid-gas 2-phase counter flow flame. The successful demonstration of time series temperature measurement in the spray flame gives us motivation of trying to establish non-intrusive temperature measurement method in the practical spray flame.

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An Experimental Study on Temperature Measurement Bias using Thermocouple in Simulated Thermal Environments of Fire (모사된 화재의 열적환경에서 열전대를 이용한 온도 측정오차에 관한 실험적 연구)

  • Han, Ho-Sik;Yun, Hong-Seok;Hwang, Cheol-Hong;Kim, Sung-Chan
    • Journal of the Korean Society of Safety
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    • v.32 no.2
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    • pp.7-13
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    • 2017
  • An experimental study was conducted to identify the quantitative measurement bias for the bare-bead thermocouple (TC), which was widely used for measuring temperature in fire experiments. To this end, an apparatus could be controlled individually gas flow rate, preheating temperature and incident radiative heat flux was developed to simulate the thermal environments of fire. A relative measurement bias of bare-bead TC was evaluated with the comparison of double-shield aspirated TC. As a result, the relative measurement bias of bare-bead TC was gradually increased with the increase in radiative heat flux with constant gas temperature. The relative bias was also significantly increased with the decrease in gas temperature. Quantitatively, at the gas temperature of $20^{\circ}C$, the bare-bead TC had the relative bias of approximately 400% with the radiative heat flux of $20kW/m^2$ corresponding to thermal radiation level of the flashover. The present study was intend to provide fire researchers with methodologies for the reanalyses of temperature measured using bare-bead TC, radiation corrections, and validation of fire modeling.

A Review of Temperature Measurement of Fire Driven Flow Using Thermocouple - Measurement Bias (열전대에 의한 화재유동의 온도측정에 관한 검토 - 측정오차)

  • Kim, Sung-Chan
    • Fire Science and Engineering
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    • v.24 no.6
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    • pp.98-103
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    • 2010
  • A series of fire experiments have been performed to examine the measurement bias of the bare bead thermocouple widely used in fire testing and analyze the measurement bias of bare bead thermocouple comparing with the measured temperature using the aspirated thermocouple. The measured temperature of the bare bead thermocouple was lower than that of the aspirated thermocouple in the hot upper layer while it showed opposite trends in the upper layer. Also, the bare bead thermocouple showed higher measurement bias in the lower layer rather than upper layer in the compartment fire. The maximum relative percentage error of the bare bead thermocouple against the aspirated thermocouple reached 250% in the present study. The present study points out the need of correction process of the measured temperature by bare bead thermocouple for improving the reliability of the fire tests.

Concentration Measurement of Alcohol Solution Using Immersion-Type On-Line Refractometer (침적식 온라인 굴절계를 이용한 알코올 농도의 측정)

  • 정옥진;김영한
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.6
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    • pp.473-477
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    • 2003
  • An immersion-type on-line refractometer useful for the in-situ measurement of chemical composition and temperature is developed, and its performance is examined by applying the refractometer to known alcohol solution having concentrations between 0 vol. % and 25 vol. %. Because refractive index and temperature are measured simultaneously, it is possible to compensate the effect of temperature for fast and direct measurement. The outcome of composition measurement for the different concentrations of alcohol solution indicates that the device is suitable for the chemical composition measurement by yielding stable and reproducible reading.

Adiabatic Characteristics of Concrete Temperature with Economical Negative Temperature Coefficient Ceramics Sensor System (경제적인 NTC 세라믹스 온도센서 시스템을 이용한 콘크리트 수화열 계측에 관한 실험적 연구)

  • 김기수;김종우;전재홍;하재담;김태홍
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.391-396
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    • 2001
  • In order to estimate thermal cracking in mass concrete and to decide the removal time of the forms outside the concrete structures in wintertime, temperature measurement is indispensible. Until now, the measurement system employs thermocouple type. In this paper, we introduce economical and accurate NTC(Negative Temperature Coefficient) ceramic type measurement system. In principle, NTC ceramic type sensor is very sensitive in the range -20~15$0^{\circ}C$. In this range, the signal change is so large that the sensor needs less amplification than thermocouple. Therefore, not only the sensor itself is inexpensive but also the system is too. In this experiments the temperature of the NTC system are identical to those of thermocouple. In conclusion, inexpensive NTC thermistor system is very adequate to the temperature measurement during concrete curing.

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Implementation of Temperature Measurement System Using Fuzzy Theory (Fuzzy 이론을 이용한 디지털 온도계측 시스템의 구현)

  • Kang, Moon-Sung;Hong, Sung-Hun
    • Proceedings of the KIEE Conference
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    • 1997.07b
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    • pp.510-512
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    • 1997
  • Measurement errors in a temperature measurement system are mainly due to the consisting elements' accuracies and the circuit parameters' changes following the environment variations such as temperature. Further, system's non-linearity makes the measurement accuracy worse, and accordingly a linearization method should be considered to avoid this worsening. In this study, an error-correction method and a linearization method are proposed and a system utilizing these methods is realized.

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Construction Broadband CARS Spectrometer and Uncertainty Analysis of Temperature Measurement (광대역 CARS 분광기의 제작과 온도 측정의 정확도 분석)

  • 박승남
    • Korean Journal of Optics and Photonics
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    • v.4 no.2
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    • pp.226-232
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    • 1993
  • A broadband CARS system is constructed for shot by shot measurement of a full CARS spectrum, which consists of a frequency doubled Nd:Yag laser, broadband mode-less laser and optical multi-channel analyzer installed in a double grating monochromator. To increase the accuracy of CARS temperature measurement and get better the fitting goodness, we have measured the slit function of the detection system and determined the analytical functional form of the slit function. Accuracy of the CARS system for temperature measurement is evaluated from the difference between the best-fit temperature of CARS spectrum and temperature of thermocouple reading. The uncertainty of the temperature measurement is found to be less than 1.5% in temperature range from 300 K to 1300 K.

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