차축발열검지를 위한 4픽셀 적외선 디텍터 광학계에 관한 연구

임재우(Jae-Woo Lim),최재식(Jae-Sik Choi),윤석한(Seok-Han Yoon),신진호(Jin-Ho Shin),임형태(Hyung-Tae Lim),곽수영(Soo-Young Kwak) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5

현재 국내에 설치된 HBD(차축발열검지장치, Hot Box Detector)는 고속열차의 차축에서 발생하는 온도 검지를 위해 적외선을 이용한 비접촉 온도측정방식을 사용하고 있다. 비접촉 온도측정방식은 움직이는 사물에 대한 온도측정과 같이 접촉식 온도센서로 측정이 불가능한 환경에서도 온도측정을 가능하게 해준다. 본 연구에서 사용하는 적외선 디텍터는 총 4 개 픽셀로 이루어진 적외선 검지센서들을 사용하여 4개의 포인트에서 발생되는 3 ~ 5㎛의 파장대역의 적외선을 검지함으로써 온도를 측정한다. 적외선 디텍터를 사용하여 차축의 발열을 검지하기 위해서는 발열체에서 발생하는 적외선을 센서에 집중시켜 줄 수 있는 전용 광학계를 필요로 한다. 본 논문에서는 차축발열검지를 위해 4 개의 픽셀로 이루어진 적외선 디텍터를 위한 광학계의 개발에 관하여 소개하고자 한다. HBD(Hot Box Detector), which is installed in Korea, applies non-contact temperature measuring methods using infrared rays to detect the temperature emitted from the axle box of highspeed trains. The non-contact temperature measuring methods make it available to check the temperature that is impossible to measure with a contact temperature sensor like gauging the temperature of moving objects. The infrared detector used in this study utilizes the detection sensors that have total 4 pixels and measures the temperature by detecting the infrared light in 3 ~ 5㎛ wavelength band, which is generated in 4 points. Therefore, the dedicated optical system that is able to concentrate the infrared rays from heating elements on the sensors is required to detect the heat of axle box with the infrared detector. In this research, the development of optical system for 4-pixels infrared detector will be introduced to detect the heat of axle box.

Prediction of Locomotor Activity by Infrared Motion Detector on Sleep-wake State in Mice

Jeonghyun Park,Min Soo Jung,Eunsoo Moon,Hyun Ju Lim,Chi Eun Oh,Jung Hyun Lee 대한정신약물학회 2021 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.19 No.2

Objective: Behavioral assessments that effectively predict sleep-wake states were tried in animal research. This study aimed to examine the prediction power of an infrared locomotion detector on the sleep-wake states in ICR (Institute Cancer Research) mice. We also explored the influence of the durations and ways of data processing on the prediction power. Methods: The locomotor activities of seven male mice in home cages were recorded by infrared detectors. Their sleep-wake states were assessed by video analysis. Using the receiver operating characteristic curve analysis, the cut-off score was determined, then the area under the curve (AUC) values of the infrared motion detector that predicted sleep-wake states were calculated. In order to improve the prediction power, the four ways of data processing on the prediction power were performed by Matlab 2013b. Results: In the initial analysis of raw data, the AUC value was 0.785, but it gradually reached to 0.942 after data summation. The simple data averaging and summation among four different methods showed the maximal AUC value. The 10-minute data summation improved sensitivity (0.889) and specificity (0.901) significantly from the baseline value (sensitivity 0.615; specificity 0.936) (p < 0.001). Conclusion: This study suggests that the locomotor activity measured by an infrared motion detector might be useful to predict the sleep-wake states in ICR mice. It also revealed that only simple data summation may improve the pre-dictive power. Using daily locomotor activities measured by an infrared motion detector is expected to facilitate animal research related to sleep-wake states.

Boron-doped hydrogenated mixed-phase silicon as thermo-sensing films for infrared detectors

Phong Pham, Duy,Park, Jinjoo,Shin, Chonghoon,Kim, Sangho,Nam, Yonghyun,Kim, Geunho,Kim, Minsik,Yi, Junsin Elsevier 2018 Materials science in semiconductor processing Vol.74 No.-

<P><B>Abstract</B></P> <P>Silicon materials have been widely used as thermo-sensing layers in infrared detectors or uncooled micro-bolometers. Parameters such as a large thermal coefficient of resistance (TCR), low sheet resistance (R<SUB>s</SUB>), and low 1/f noise are important for high performance of these devices. However, there is always a trade-off between these parameters. For example, the crystalline silicon materials typically exhibit low R<SUB>s</SUB> and 1/f noise, and significantly low TCR, while the amorphous silicon materials generally have large TCR, and considerably high R<SUB>s</SUB> and 1/f noise. Consequently, the best trade-off can be achieved by using a mixed-phase structure of silicon materials, i.e. an intermediate form between the crystalline and amorphous structures. Herein we report the important characteristics of hydrogenated mixed-phase silicon films, deposited by the plasma-enhanced chemical vapour deposition process, for infrared detectors. The films in the mixed-phase structure showed high TCR values in the range of 2–3%K<SUP>–1</SUP> and moderate sheet resistances in range of 10–40MΩsq<SUP>−1</SUP>. These results indicate that the mixed-phase silicon films are potential alternatives to conventional boron doped hydrogenated amorphous and microcrystalline silicon films for use as thermo-sensing layers in infrared detectors.</P>

An Optical Cavity Design for an Infrared Gas Detector Using an Off-axis Parabolic Mirror

정유진,강동화,서재영,조예지,서진희,최환영,정미숙 한국광학회 2019 Current Optics and Photonics Vol.3 No.5

This study examined a method for designing the optical cavity of a non-dispersive infrared gas detector. The infrared gas detector requires an optical cavity design to lengthen the ray path. However, the optical cavity with multiple reflecting surfaces has off-axis aberration due to the characteristics of the reflecting optical system. The rays were parallelized by using the off-axis parabolic mirror to easily increase the ray path and eliminate off-axis aberration so that the rays are admitted to the effective area of the infrared detector uniformly. A prototype of an infrared gas detector was produced with the designed optical cavity to confirm the performance.

복사 차폐막이 설치된 극저온 용기의 열부하 특성에 관한 실험적 연구

김영민(Young Min Kim),강병하(Byung Ha Kang),박성제(Seong-Je Park) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.1

Infrared (IR) detectors are widely used for such applications as thermoelastic stress analysis, medical diagnostics and temperature measurement. Infrared detectors commonly need to be refrigerated below 80 K, and thus a cooling system should be equipped together with the detector system. The cooling load, which should be removed by the cooling system to maintain the nominal operating temperature of the detector, critically depends on the insulation efficiency of the cryochamber housing the detector. Thermal load of a cryochamber is attributed to the conduction heat transfer through a cold finger, the gases conduction and radiation heat transfer. The thermal loads of an infrared detector cryochamber with a radiation shield are investigated experimentally in present study. Since the effect of radiation heat transfer on thermal loads is significant, radiation shields is installed in the cold finger part to protect heat input through radiation.

Electrical Properties of Co- and Cu-Doped Nickel Manganite System Thick Films for Infrared Detectors

Lee, Dong-Jin,Lee, Sung-Gap,Kim, Kyeong-Min,Kwon, Min-Su The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.5

$Ni_{0.79}Co_{0.15-x}Cu_xMn_{2.06}O_4$ ($0{\leq}x{\leq}0.09$) thick films were fabricated using the conventional solid-state reaction method and screen-printing method. Structural and electrical properties of specimens based on the amount of Cu were observed in order to investigate their applicability in the infrared detector. All specimens showed a single spinel phase with a homogeneous cubic structure. As the amount of Cu increased, the average grain size increased and was found to be approximately $5.01{\mu}m$ for the $Ni_{0.79}Co_{0.06}Cu_{0.09}Mn_{2.06}O_4$ specimen. The thickness of all specimens was approximately $55{\sim}56{\mu}m$. As Cu content increased, the resistivity and TCR properties at room temperature decreased, and these values for the $Ni_{0.79}Co_{0.06}Cu_{0.09}Mn_{2.06}O_4$ specimen were $502{\Omega}-cm$ and $-3.32%/^{\circ}C$, respectively. The responsivity and noise properties decreased with an increase in Cu content, with the specimen with a Cu content of x=0.09 showing 0.0183 V/W and $5.21{\times}10^{-5}V$, respectively.

Electrical Properties of Co- and Cu-Doped Nickel Manganite System Thick Films for Infrared Detectors

이동진,이성갑,김경민,권민수 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.5

Ni0.79Co0.15-xCuxMn2.06O4 (0≤x≤0.09) thick films were fabricated using the conventional solid-state reaction method and screenprintingmethod. Structural and electrical properties of specimens based on the amount of Cu were observed in order toinvestigate their applicability in the infrared detector. All specimens showed a single spinel phase with a homogeneous cubicstructure. As the amount of Cu increased, the average grain size increased and was found to be approximately 5.01 μm forthe Ni0.79Co0.06Cu0.09Mn2.06O4 specimen. The thickness of all specimens was approximately 55~56 μm. As Cu content increased,the resistivity and TCR properties at room temperature decreased, and these values for the Ni0.79Co0.06Cu0.09Mn2.06O4 specimenwere 502 Ω-cm and –3.32%/℃, respectively. The responsivity and noise properties decreased with an increase in Cu content,with the specimen with a Cu content of x=0.09 showing 0.0183 V/W and 5.21x10-5 V, respectively.

Electrical Properties of Co- and Cu-Doped Nickel Manganite System Thick Films for Infrared Detectors

Dong-jin Lee,Sung-gap Lee,Kyeong-min Kim,Min-su Kwon 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.5

Ni_0.79Co_0.15-xCu_xMn_2.06O₄ (0≤x≤0.09) thick films were fabricated using the conventional solid-state reaction method and screenprinting method. Structural and electrical properties of specimens based on the amount of Cu were observed in order to investigate their applicability in the infrared detector. All specimens showed a single spinel phase with a homogeneous cubic structure. As the amount of Cu increased, the average grain size increased and was found to be approximately 5.01 μm for the Ni_0.79C o_0.06Cu_0.09Mn_2.06O₄ specimen. The thickness of all specimens was approximately 55~56 μm. As Cu content increased, the resistivity and TCR properties at room temperature decreased, and these values for the Ni_0.79Co_0.06Cu_0.09Mn_2.06O₄ specimen were 502 Ω-cm and -3.32%/℃, respectively. The responsivity and noise properties decreased with an increase in Cu content, with the specimen with a Cu content of x=0.09 showing 0.0183 V/W and 5.21x10^-5 V, respectively.

A review on non-dispersive infrared gas sensors: Improvement of sensor detection limit and interference correction

Dinh, T.V.,Choi, I.Y.,Son, Y.S.,Kim, J.C. Elsevier Sequoia 2016 Sensors and actuators. B Chemical Vol.231 No.-

Non-dispersive infrared (NDIR) gas sensors applied in an environmental field are considered. Disadvantages of the non-dispersive infrared (NDIR) gas sensors include spectral interference and high detection limit. Efforts to improve these disadvantages are reviewed in this paper. Interference caused by water vapor and gas matrix has been partially solved using optical filters and interference correction factors. Limitations such as accuracy and sensitivity of the sensor were overcome by the improvements of inlet gas concentrations, infrared sources, optical designs (including optical filter and gas chamber) and detectors. These improvements are limited to a few gases, in particular, carbon dioxide. Drawbacks related to water vapor still remain and need to be addressed.

셔터방식의 쵸퍼를 이용한 정지 및 이동인체 감지 모듈 개발

차형우(Hyeong-Woo Cha),이원호(Won-Ho Lee) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.2