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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~27권5호(2018) |수록논문 수 : 1,659
센서학회지
27권5호(2018년 09월) 수록논문
최근 권호 논문
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1Plasmon-enhanced Infrared Spectroscopy Based on Metasurface Absorber with Vertical Nanogap

저자 : Inyong Hwang , Jongwon Lee , Joo-yun Jung

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 275-279 (5 pages)

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In this study, we introduce a sensing platform based on a plasmonic metasurface absorber (MA) with a vertical nanogap for the ultrasensitive detection of monolayer molecules. The vertical nanogap of the MA, where the extremely high near-field is uniformly distributed and exposed to the external environment, is formed by an under-cut structure between a metallic cross nanoantenna and the mirror layer. The accessible sensing area and the enhanced near-field of the MA further enhance the sensitivity of surface-enhanced infrared absorption for the target molecule of 1-octadecanethiol. To provide strong coupling between the molecular vibrations and plasmonic resonance, the design parameters of the MA with a vertical nanogap are numerically designed.

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2Recent Developments Involving the Application of Infrared Thermal Imaging in Agriculture

저자 : Jun-soo Lee , Gwang-wook Hong , Kyeongho Shin , Dongsoo Jung , Joo-hyung Kim

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 280-293 (14 pages)

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The conversion of an invisible thermal radiation pattern of an object into a visible image using infrared (IR) thermal technology is very useful to understand phenomena what we are interested in. Although IR thermal images were originally developed for military and space applications, they are currently employed to determine thermal properties and heat features in various applications, such as the non-destructive evaluation of industrial equipment, power plants, electricity, military or drive-assisted night vision, and medical applications to monitor heat generation or loss. Recently, IR imaging-based monitoring systems have been considered for application in agricultural, including crop care, plant-disease detection, bruise detection of fruits, and the evaluation of fruit maturity. This paper reviews recent progress in the development of IR thermal imaging techniques and suggests possible applications of thermal imaging techniques in agriculture.

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3주변 온도 영향에 따른 비분산 적외선 가스센서의 출력 특성 해석

저자 : 박한길 ( Han-gil Park ) , 이승환 ( Seung-hwan Yi )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 294-299 (6 pages)

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This article describes the output properties of non-dispersive infrared carbon dioxide(CO2) sensors resulting from the changes in ambient temperatures. After the developed sensor module was installed inside the gas chamber, the temperature was set to 267 K, 277 K, 300 K, and 314 K, and the concentrations of CO2 gas were increased from 0 to 5,000 ppm. Then, the output voltage at each concentration was obtained. Through these experimental results, two observations were made. First, both the CO2 sensor and the reference sensor showed an increase in the output voltages as the temperature rose from 0 ppm, Second, the full scale outputs of the CO2 sensor grew as the temperature increased. The output characteristics were analyzed based on two factors: change in the radiant energy of the infrared light source and change in the absorptivity of CO2 gas according to the ambient temperature. Additionally, temperature compensation methods were discussed.

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4웨이퍼 레벨 진공 패키징 비냉각형 마이크로볼로미터 열화상 센서 개발

저자 : 안미숙 ( Misook Ahn ) , 한용희 ( Yong-hee Han )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 300-305 (6 pages)

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The uncooled microbolometer thermal sensor for low cost and mass volume was designed to target the new infrared market that includes smart device, automotive, energy management, and so on. The microbolometer sensor features 80x60 pixels low-resolution format and enables the use of wafer-level vacuum packaging (WLVP) technology. Read-out IC (ROIC) implements infrared signal detection and offset correction for fixed pattern noise (FPN) using an internal digital to analog convertor (DAC) value control function. A reliable WLVP thermal sensor was obtained with the design of lid wafer, the formation of Au80%wtSn20% eutectic solder, outgassing control and wafer to wafer bonding condition. The measurement of thermal conductance enables us to inspect the internal atmosphere condition of WLVP microbolometer sensor. The difference between the measurement value and design one is 3.6×10-9 [W/K] which indicates that thermal loss is mainly on account of floating legs. The mean time to failure (MTTF) of a WLVP thermal sensor is estimated to be about 10.2 years with a confidence level of 95 %. Reliability tests such as high temperature/low temperature, bump, vibration, etc. were also conducted. Devices were found to work properly after accelerated stress tests. A thermal camera with visible camera was developed. The thermal camera is available for non-contact temperature measurement providing an image that merged the thermal image and the visible image.

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5저항성 홀배열이 적용된 볼로미터의 적외선 흡수 특성 변화

저자 : 김태현 ( Tae Hyun Kim ) , 오재섭 ( Jaesub Oh ) , 박종철 ( Jongcheol Park ) , 김희연 ( Hee Yeoun Kim ) , 이종권 ( Jong-kwon Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 306-310 (5 pages)

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In order to develop a highly sensitive infrared sensor, it is necessary to develop techniques for decreasing the rate of heat absorption and the transition of the absorption wavelength to a longer wavelength, both of which can be induced by decreasing the pixel size of the bolometer. Therefore, in this study, 1 μm hole-arrays with a subwavelength smaller than the incident infrared wavelength were formed on the amorphous silicon-based microbolometer pixels in the absorber, which consisted of a TiN absorption layer, an a-Si resistance layer and a SiNx membrane support layer. We demonstrated that it is possible to reduce the thermal time constant by 16% relative to the hole-patternless bolometer, and that it is possible to shift the absorption peak to a shorter wavelength as well as increase absorption in the 4-8 μm band to compensate for the infrared long-wavelength transition. These results demonstrate the potential for a new approach to improve the performance of high-resolution microbolometers.

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6안테나 결합형 볼로미터 방식 테라헤르츠 센서를 이용한 이차원 주사 방식의 투과형 테라헤르츠 영상 취득에 관한 연구

저자 : 이경일 ( Kyoung Il Lee ) , 임병직 ( Byung Jik Lim ) , 원종석 ( Jongsuk Won ) , 홍성민 ( Sung Min Hong ) , 박재현 ( Jae Hyoun Park ) , 이대성 ( Dae Sung Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 311-316 (6 pages)

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An antenna-coupled bolometer-type terahertz sensor was designed, fabricated, evaluated, and utilized to obtain terahertz transmission images. The sensor consists of a thin film bowtie antenna that resonates accordingly in response to an incident terahertz beam, a heater that converts the applied current in the antenna into heat, and a microbolometer that converts the rise in temperature into a change in resistance. The device is fabricated by a bulk micromachining process on a 4-inch silicon wafer. The fabricated sensor chip has a size of 2 × 2 mm and an active area of 0.1 × 0.1 ㎟. The temperature coefficient of resistance (TCR) of the bolometer film (VOx) is 2.0%, which is acceptable for bolometer applications. The output sensor signal is proportional to the power of the incident terahertz beam. Transmission images were obtained with a 2-axis scanning imaging system that contained the sensor. The small active area of the sensor will enable the development of highly sensitive focal plane array sensors in terahertz imaging cameras in the future.

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7레이저 기반 테라헤르츠 시간영역 분광 및 영상 기술

저자 : 강광용 ( Kwang-yong Kang ) , 권봉준 ( Bong-joon Kwon ) , 백문철 ( Mun Cheol Paek ) , 강경곤 ( Kyeong Kon Kang ) , 조수영 ( Jangsun Kim ) , 김장선 ( Suyoung Cho ) , 이승철 ( Senung-churl Lee ) , 이대성 ( Dae-sung Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 317-327 (11 pages)

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THz 시간 영역 분광학(TDS)은 이제 성숙한 분야가 되었고, 그 기술은 전 세계적으로 수백 개의 연구실에서 사용되고 있지만, THz 시스템의 개선에 대한 여지는 아직 많이 남아있다. 도전과제의 핵심은 모드-잠김 에지 방사(edge emitting) 반도체방출 반도체 레이저와 광전도 반도체 양자 구조의 개선이다. 또한 대량 생산을 위한 기술과 3D 프리팅과 같은 혁신적인 제조 기술도 매우 효과적이다. 최근에 상용제품으로 출시된 OSCAT 시스템과 ASOPS 시스템을 이용하여 분광/영상기법을 반도체 패키지 칩에 적용하기도 하였다.
한편, THz 분광법이 정적(static)이거나 또한 시간-분해적이든 간에 모두 반도체 소재 및 반도체 나노 구조의 특성을 평가하는 데 있어서 선도적인 기법이 될 것이다. 향후에는 점점 더 좁은 영역을 탐구하는 방법이나 THz 응용 시스템을 평형상태에서 벗어나게 하는 툴(tool)로써 사용될 가능성도 높다. 또한 메타(meta) 물질을 이용하여 THz 시스템에 적용할 경우, 가변 필터와 같은 순시적인 광학 부품이 가능하므로 광여기(photoexcited) 반도체 소자(신호원)으로 이용하는 구상/디자인도 할 수 있다.


Terahertz (THz) time-domain spectroscopy(TDS), imaging techniques, and related systems have become mature technologies, widely used in many universities and research laboratories. However, the development of creative technologies still requires improved THz application systems. A few key points are discussed, including the innovative advances of mode-locking energy-emitting semiconductor lasers and better photoconductive semiconductor quantum structures. To realize a compact, low cost, and high performance THz system, it is essential that THz spectroscopy and imaging technologies are better characterized by semiconductor and nano-devices, both static and time-resolved. We introduce the THz spectroscopy and imaging systems, the OSCAT(Optical Sampling by laser CAvity Tuning) system and the ASOPS(ASynchronous Optical Sampling) system, are constructed by our research team. We report on the THz images obtained from their use.

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8비파괴검사를 위한 연속형 테라헤르츠 파 기반의 영상화 기술

저자 : 오경환 ( Gyung-hwan Oh ) , 김학성 ( Hak-sung Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 328-334 (7 pages)

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The paper reviews an improved continuous-wave (CW) terahertz (THz) imaging system developed for nondestructive inspection, such as CW-THz quasi-time-domain spectroscopy (QTDS) and interferometry. First, a comparison between CW and pulsed THz imaging systems is reported. The CW-THz imaging system is a simple, fast, compact, and relatively low-cost system. However, it only provides intensity data, without depth and frequency- or time-domain information. The pulsed THz imaging system yields a broader range of information, but it is expensive because of the femtosecond laser. Recently, to overcome the drawbacks of CW-THz imaging systems, many studies have been conducted, including a study on the QTDS system. In this system, an optical delay line is added to the optical arm leading to the detector. Another system studied is a CW-THz interferometric imaging system, which combines the CW-THz imaging system and far-infrared interferometer system. These systems commonly obtain depth information despite the CW-THz system. Reportedly, these systems can be successfully applied to fields where pulsed THz is used. Lastly, the applicability of these systems for nondestructive inspection was confirmed.

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9볼로미터형 테라헤르츠 센서의 광학적 특성 연구

저자 : 한명수 ( Myung Soo Han ) , 송우섭 ( Woosub Song ) , 홍정택 ( Jung Taek Hong ) , 이동희 ( Donghee Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 335-339 (5 pages)

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The optical characteristics of a terahertz (THz) antenna-coupled bolometer (ACB) detector were evaluated using a pulsed quantum cascade laser (QCL) and radiation blackbody sources. We investigated a method for measuring the responsivity and noise-equivalent power (NEP) of the THz detector using two different types of light sources. When using a QCL source with a frequency of 3 THz, the average responsivity of 24 devices was 1.44×103 V/W and the average NEP of those devices was 3.33×10-9 W/√Hz. The average responsivity and NEP as measured by blackbody source were 1.79×105 V/W and 6.51×10-11 W/√Hz, respectively, with the measured values varying depending on the light source. This was because the output power of each light source was different, with the laser source being driven by a pulse type wave and the blackbody source being driven by a continuous wave. The power input to the THz sensor was also different. Futhermore, the responsivity and NEP values measured using band pass filter (BPF) were similar to those measured when using only THz windows. It was found that ACB sensor responds normally in the THz region to both the laser and the blackbody source, and the method was confirmed to effectively evaluate the characteristics of the THz sensor.

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10Study on Reusable Electrodes for Personal Electrocardiography

저자 : Jonghoon Kim , Gilwon Yoon

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 5호 발행 연도 : 2018 페이지 : pp. 340-344 (5 pages)

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Electrodes are an important part of electrocardiography (ECG); disposable electrodes have been extensively used. However, personal ECG monitoring devices for Internet of Things applications require reusable electrodes. As there have been no systematic studies on the characteristics of reusable electrodes to date, we conducted this study to assess the performance and feasibility of electrodes with different materials. We built reusable electrodes using twelve different metallic materials, including commonly used copper, silver, zinc, plating materials, chemically inert titanium, stainless steel, and aluminum. Each electrode was fabricated to a size of 5 × 10 mm. Their characteristics such as offset, baseline drift, stabilization time, and chemical inertness were compared. A personal ECG monitoring system was used to test the manufactured electrodes. The performances of the Ag, Cu, and Zn electrodes were better than the performances of other electrodes. However, these materials may not be used owing to the chemical changes that occur when the electrodes are in contact with the skin, such as discoloration and corrosion, which deteriorate their electrical characteristics. Titanium, stainless steel, and aluminum are chemically stable. The titanium electrode showed the best performance among the three, and it is our recommendation as a material for manufacturing reusable electrodes.

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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2미국의 비트코인 규제

(2006)홍길동심리학41회 피인용

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2미국의 비트코인 규제

(2006)홍길동41회 피인용

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