• Title/Summary/Keyword: Temperature Sensitivity

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Temperature-difference Flow Sensor Using Multiple Fiber Bragg Gratings

  • Kim, Kyunghwa;Eom, Jonghyun;Sohn, Kyungrak;Shim, Joonhwan
    • Current Optics and Photonics
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    • v.6 no.3
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    • pp.297-303
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    • 2022
  • Multiple fiber Bragg gratings (FBGs) have been proposed and demonstrated for gas-flow measurements in a flow channel, using the temperature-difference method. This sensor consists of two FBG temperature sensors and two coil heaters. Coil heaters are used to heat the FBGs. The flow rate of the gas can be obtained by monitoring the difference in the Bragg-wavelength shifts of the two FBGs, which has features that exclude the effect of temperature fluctuations. In this study, experiments are conducted to measure the wavelength shift based on the flow rate, and to evaluate the gas-flow rate in a gas tube. Experimental results show that the sensor has a linear characteristic over a flow-rate range from 0 to 25 ℓ/min. The measured sensitivity of the sensor is 3.2 pm/(ℓ/min) at a coil current of 120 mA.

[Retracted]The effect of Massage and Paraffin on Cold Hypersensitivity Patient ([논문표절]수족냉증에 적용한 마사지와 파라핀의 효과)

  • Roh, Hyo-lyun
    • Proceedings of the Korea Contents Association Conference
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    • 2017.05a
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    • pp.101-102
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    • 2017
  • This study of purpose was to evaluate the changes in hands and feet temperature by applying massage and paraffin bath.. The subject of this study was 30 university healthy students. Subjects were divided into paraffin bath group and massages group. The digital infrared thermographic imaging was used for thermographic analysis. The visual analog scale was used for subjective information about the degree of cold sensitivity and cold stress test was used for analyzing the temperature recovery rate. After the interventions showed that temperature difference of the right hand and temperature difference of the left hand are less in the paraffin group than the massage group. When applied paraffin bath and massage to the cold hypersensitivity patient the massage group showed difference in the visual analog scale and the paraffin group showed difference in the temperature of the right hand, left hand, left foot and in the visual analog scale. Paraffin bath treatment seems to be useful to patients with cold hypersensitivity on hands and feet.

Temperature sensor without reference resistor by indium tin oxide and molybdenum (인듐틴옥사이드와 몰리브데늄을 이용한 외부 기준 저항이 필요 없는 온도센서)

  • Jeon, Ho-Sik;Bae, Byung-Seong
    • Journal of Sensor Science and Technology
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    • v.19 no.6
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    • pp.483-489
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    • 2010
  • Display quality depends on panel temperatures. To compensate it, temperature sensor was integrated on the panel. The conventional temperature sensor integrated on the panel needs external reference resistor. Since the resistance of external resistor can vary according to the variation of the environment temperature, the conventional temperature sensor can make error in temperature sensing. The environmental temperatures can change by the back light unit, driving circuits or chips. In this paper, we proposed a integrated temperature sensor on display panel which does not need external reference resister. Instead of external reference resistor, we used two materials which have different temperature coefficient in resistivity. They are connected serially and the output voltage was measured at the point of connection with the applied voltage to both ends. The proposed sensor was fabricated with indium tin oxide(ITO), and Mo metal electrode temperature sensor which were connected serially. We verified the temperature senor by the measurements of sensitivity, lineality, hysteresis, repeatability, stability, and accuracy.

Comparison of Rectal Temperature with Axillary and Tympanic Temperature (신생아의 직장체온과 고막 및 액와체온과의 비교)

  • Hwang Jin-Soon;Sohng Kyeong-Yae
    • Journal of Korean Academy of Fundamentals of Nursing
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    • v.4 no.2
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    • pp.351-358
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    • 1997
  • Body temperature should be measured accurately to assess neonate's condition for proper care. Temperatures measured in rectal, axillary and tympanic site were compared in 129 normal neonates to find out proper nursing time for measuring temperature and the validity of fever detection. The results were as follows : 1. Mean temperatures of axillary and tympanic site($36.85^{\circ}C,\;37.12^{\circ}C$) were significantly lower than those of rectal site($37.19^{\circ}C$). 2. Mean nursing time for measuring body temperature was significantly higher and lower in axillary and tympanic temperatures(159.49 seconds, 11.07 seconds) than in rectal temperature(105.62 seconds). 3. Tympanic and axillary temperatures were significantly correlated with rectal temperature (r=0.85, r=0.78) and the significant correlation was demonstrated between tympanic and axillary temperatures(r=0.76). 4. Sensitivity, specificity, positive and negative predictive values were 0.87, 0.90, 0.72, 0.96 for detecting fever respectively. The above findings indicated that the tympanic thermometer offers a useful alternative to conventional methods.

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A Triangular/Square Waveforms Generator Using Linear OTA's (선형 OTA를 이용한 삼각파/구형파 발생기)

  • 박상렬;박지만정원섭
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.663-666
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    • 1998
  • A triangular/square waveforms generator with current controllable frequency is described. The genertor utilizes operational transconductance amplifiers as switching elements. The circuit built with commercially available components exhibits good linearity of current to frequency and relatively low temperature sensitivity.

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Current-controllable saw-tooth waveform generator using OTA's (OTA를 이용한 전류-제어 톱니파 발생기)

  • 임동빈;정원섭;송재훈;김희준
    • Proceedings of the IEEK Conference
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    • 2001.06e
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    • pp.177-180
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    • 2001
  • A saw-tooth waveform generator with current-controllable frequency is described. The generator utilizes operational transconductance amplifiers as switching element. It features simple and wide sweep capability. The circuit built with commercially avaliable components exhibits good linearity of current to frequency and relatively low temperature sensitivity.

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Microfabrication of Thin Film Sensor with Metal Oxide Nanostructure and Their Gas Sensing Properties (금속 산화물 나노구조형 마이크로 박막 센서의 제작 및 가스 응답 특성)

  • Kang Bong-Hwi;Lee Sang-Rok;Song Kap-Duk;Joo Byung-Su;Lee Duk-Dong
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.8 s.350
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    • pp.13-18
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    • 2006
  • [ $SnO_2$ ] and ZnO nanostructures were grown on the surface of thin film by heat treatment of metal Sn, Zn under Ar gas flow and $O_2$ at atmospheric pressure, respectively. The sensitivity of the $SnO_2$ thin film device on which grown nanowires to CO gas(5,000 ppm) was 50 % at the operating temperature of $200^{\circ}C$. In case of using Pt as catalysts, the sensitivity was enhanced and operating temperature was reduced(73 % at $150^{\circ}C$ ). The sensitivity of the ZnO nanorods device using Cu as catalysts to NOx gas was 90 % at the operating temperature of $200^{\circ}C$. It was found that the sensitivity to CO and NOx gases for the device on which grown nanostructures was much higher than those for general thin film device.

Fabrication and Performance Investigation of Surface Temperature Sensor Using Fluorescent Nanoporous Thin Film II (형광 나노 포러스 박막을 이용한 표면 온도 센서의 제작 및 성능 연구 II)

  • Kim, Hyun Jung;Yoo, Jaisuk;Park, Jinil
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.12
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    • pp.674-678
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    • 2013
  • We present a non-invasive technique to the measure temperature distribution in nano-sized porous thin films by means of the two-color laser-induced fluorescence (2-LIF) of rhodamine B. The fluorescence induced by the green line of a mercury lamp with the makeup of optical filters was measured on two separate color bands. They can be selected for their strong difference in the temperature sensitivity of the fluorescence quantum yield. This technique allows for absolute temperature measurements by determining the relative intensities on two adequate spectral bands of the same dye. To measure temperature fields, Silica (SiO2) nanoporous structure with 1-um thickness was constructed on a cover glass, and fluorescent dye was absorbed into these porous thin films. The calibration curves of the fluorescence intensity versus temperature were measured in a temperature range of $10-60^{\circ}C$, and visualization and measurement of the temperature field were performed by taking the intensity distributions from the specimen for the temperature field.

A Study on the Shear Characteristics of Adhesives in Primary Mirror Supports of Satellite Camera (인공위성 카메라 주반사경 지지부에 적용되는 접착제의 전단 특성 연구)

  • Kim, Hyun-Jung;Seo, Yu-Deok;Park, Sang-Hoon;Youn, Sung-Kie;Lee, Seung-Hoon;Lee, Deog-Gyu;Lee, Eung-Shik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.7 s.262
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    • pp.808-815
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    • 2007
  • The optical performance of the mirror fur satellite camera is highly dependent on the adhesive properties between the mirror and its support. Therefore, in order to design a mirror with high optical performance, the mechanical properties of adhesives should be well defined. In this research, the mechanical properties of three kinds of space adhesives are studied. In case of the materials which show nearly incompressible behavior such as space adhesives, it is important to measure shear modulus which governs deviatoric stress components. Also the experiment should be performed in circumstances similar to real manufacturing process of mirror, because extra factors such as size effects, the adhesion effects of primer and reactions between adhesive and primer affect the properties of adhesive regions. In this research shear moduli of the adhesives are determined by using a single lap adhesively bonded joint. For the shear tests, several temperatures have been selected from $-20^{\circ}C$ to $55^{\circ}C$ which is operating temperature range of the adhesive. In the case of linear behavior materials, shear moduli are calculated through a linear curve fitting. Shear stress-strain relation is obtained by using an exponential curve fitting for material which shows non-linear behavior. The shear modulus of each adhesive is expressed as a function of temperature. Characteristics and adaptability of the adhesives are discussed regarding their temperature sensitivity.