• 센서학회지
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• 제5권1호
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• pp.1-8
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• 1996

고감도 초전형 적외선 센서를 La이 첨가된 $PbTiO_{3}$(PLT) 박편을 이용하여 제작하였다. 재료의 조성비는 $(Pb_{0.9}La_{0.1}Ti_{0.75}O_3)_{0.75}(PbO)_{0.25}$ 이고 PLT 박편의 두께는 $100{\mu}m$로 제작하였다. 수광전극은 니켈-크롬을, 그리고 하부 전극으로는 은을 각각 $1{\times}2\;mm^{2}$ 크기로 진공 증착 하였다. PLT 박편의 전기적 특성은 341 정도의 유전상수와 $6.41{\times}10^{10}{\Omega}{\cdot}cm$의 매우 큰 비저항 값을 얻었다. c-축으로 쌍극자가 형성된 PLT 박편은 높은 초전 특성을 나타내었으며, $4.45{\times}10^{-8}\;C/cm^{2}K$의 초전계수에 기인하여 $4.0{\times}10^{-11}\;Ccm/J$의 큰 전압 성능지수를 얻을 수 있었다. PLT 박편으로 제작된 센서는 2501 V/W의 높은 전압감도를 가지는 것으로 보아 초전형 적외선 센서의 응용이 가능하리라고 본다.

• 센서학회지
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• 제10권2호
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• pp.86-90
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• 2001

A pyroelectric senior using P(VDF/TrFE) film for sensing materials has been fabricated and evaluated with other commercial pyroelectric sensors that use ceramic materials for sensing. The device was mounted in a TO-5 housing to detect infrared light of $5.5{\sim}14\;{\mu}m$ wavelength. The NEP (noise equivalent power) and specific detectivity $D^*$ of the device were $2.13{\times}10^{-8}\;W$ and $9.37{\times}10^6\;cm/w$ respectively under emission energy of $13\;{\mu}W/cm^2$ respectively. These result shows a better characteristics than other commercial pyroelectric sensors NEP $8.08{\times}10^{-7}\;W$ and $D^*$ $2.47{\times}10^5\;cm/w$.

• 디지털융복합연구
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• 제11권8호
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• pp.191-197
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• 2013

본 논문에서는 광학식 기법을 이용한 적외선 센서(IR Sensor)를 이용하여 지폐 계수기에서 지폐가 32채널 IR Sensor를 지났을 때 빛에 대한 반사량과 투과량을 측정하여 진폐와 위폐를 구분하는 방법을 구현하였다. 진 위폐를 감별하기 위하여 10bit gray scale의 지폐 IR 이미지를 사용하였으며, 지폐이미지 정보는 0부터 4095까지이다. IR 이미지의 특징은 어두운 부분과 밝은 부분으로 나뉘며, 위폐는 이러한 IR 특징이 진폐와 다르게 나타난다. 적외선 센서는 비교적 고가이었으나 최근 대량생산으로 가격이 저렴해져 이 분야에 적용이 적합하다. 제안된 방법에서는 IR 특징을 정의한 SW의 Table과 입력된 IR 이미지의 특징을 비교하여 진폐 및 위폐를 감별하는 방법을 사용하였다. 결과적으로 구현된 시스템의 성능은 유로화 진폐의 경우 권종에 따라 1-2%의 오인식 경우가 있으나, 여러 나라의 위폐의 경우 100% 검출하여 구현 성능이 양호함을 보였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.351-354
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• 1996

A new target adaptive guidance (TAG) algorithm is proposed to engage the aim point formed by adding a bias to the information from an infrared (IR) seeker for improving passive homing guidance effectiveness. The TAG algorithm utilizes an observability enhancing mid-course guidance algorithm to obtain convergent estimates of state variables involved particularly in range channel otherwise unavailable from passive sensors. Simulation results indicate that the TAG algorithm provides improved terminal effectiveness without computational complexities.

• 센서학회지
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• 제30권6호
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• pp.446-450
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• 2021

Non-dispersive infrared (NDIR) gas sensors typically use an optical filter that transmits a discriminating 4.26 ㎛ wavelength band to measure carbon dioxide (CO2), as CO2 absorbs 4.26 ㎛ infrared. The filter performance depends on the transmittance and full width at half maximum (FWHM). This paper presents the fabrication, sensitivity, and selectivity characteristics of a distributed Bragg reflector (DBR)-based Fabry-Perot filter with a simple structure for CO2 detection. Each Ge and SiO2 films were prepared using the RF magnetron sputtering technique. The transmittance characteristics were measured using Fourier-transform infrared spectroscopy (FT-IR). The fabricated filter had a peak transmittance of 59.1% at 4.26 ㎛ and a FWHM of 158 nm. In addition, sensitivity and selectivity experiments were conducted by mounting the sapphire substrate and the fabricated filter on an NDIR CO2 sensor measurement system. When measuring the sensitivity, the concentration of CO2 was observed in the range of 0-10000 ppm, and the selectivity was measured for environmental gases of 1000 ppm. The fabricated filter showed lower sensitivity to CO2 but showed higher selectivity with other gases.

• 복식문화연구
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• 제30권4호
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• pp.579-593
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• 2022

This study examines the surface characteristics, electrical conductivity, electromagnetic wave blocking characteristics, infrared (IR) transmittance, stealth function, thermal characteristics, and moisture characteristics of IR thermal imaging cameras. Nylon film (NFi), nylon fabric (NFa), and 5 types of nylon mesh were selected as the base materials for aluminum sputtering, and aluminum sputtering was performed to study IR thermal imaging, color difference, temperature change, and so on, and the relationship with infrared transmittance was assessed. The electrical conductivity was measured and the aluminum-sputtered nylon film demonstrated 25.6kΩ of surface resistance and high electrical conductivity. In addition, the electromagnetic wave shielding characteristics of the sputtering-treated nylon film samples were noticeably increased as a result of aluminum sputtering treatment as measured by the electromagnetic wave blocking characteristics. When NFi and NFa samples with single-sided sputtering were placed on the human body (sputtering layer faced the outside air) and imaged using IR thermographic cameras, the sputtering layer displayed a color similar to the surroundings, showing a stealth effect. Moreover, the tighter the sample density, the better the stealth function. According to the L, a, b measurements, when the sputtering layer of NFi and NFa samples faced the outside air, the value of a was generally high, thereby demonstrating a concealing effect, and the △E value was also high at 124.2 and 93.9, revealing a significant difference between the treated and untreated samples. This research may be applicable to various fields, such as the military wear, conductive sensors, electromagnetic wave shielding film, and others.

• 한국생산제조학회지
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• 제19권1호
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• pp.145-155
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• 2010

This paper presents a new approach to obstacle avoidance for mobile robot in unknown or partially unknown environments. The method combines two navigation subsystems: low level and high level. The low level subsystem takes part in the control of linear, angular velocities using a multivariable PI controller, and the nonlinear position control. The high level subsystem uses ultrasonic and IR sensors to detect the unknown obstacle include static and dynamic obstacle. This approach provides both obstacle avoidance and target-following behaviors and uses only the local information for decision making for the next action. Also, we propose a new algorithm for the identification and solution of the local minima situation during the robot's traversal using the set of fuzzy rules. The system has been successfully demonstrated by simulations and experiments.

• 센서학회지
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• 제26권6호
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• pp.379-385
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• 2017

In this study, an amperometric non-enzymatic glucose sensor was developed on the surface of a glassy carbon electrode by simply drop-casting the synthesized homogeneous suspension of hexagonal boron nitride (h-BN) nanosheets with a copper metal-organic framework (Cu-MOF) composite. Comprehensive analytical methods, including field-emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), cyclic voltammetry, electrochemical impedance spectroscopy, and amperometry, were used to investigate the surface and electrochemical characteristics of the h-BN-Cu-MOF composite. The FE-SEM, FT-IR, and XRD results showed that the h-BN-Cu-MOF composite was formed successfully and exhibited a good porous structure. The electrochemical results showed a sensor sensitivity of $18.1{\mu}A{\mu}M^{-1}cm^{-2}$ with a dynamic linearity range of $10-900{\mu}M$ glucose and a detection limit of $5.5{\mu}M$ glucose with a rapid turnaround time (less than 2 min). Additionally, the developed sensor exhibited satisfactory anti-interference ability against dopamine, ascorbic acid, uric acid, urea, and nitrate, and thus, can be applied to the design and development of non-enzymatic glucose sensors.

• 센서학회지
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• 제14권5호
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• pp.337-342
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• 2005

A silicon-based micro-reactor to amplify small amount of deoxyribonucleic acid (DNA) has been fabricated using micro-electro-mechanical systems (MEMS) technology. Polymerase chain reaction (PCR) of DNA requires a precise and rapid temperature control. A Pt sensor is integrated directly in the chamber for real-time temperature measurement and an infrared lamp is used as external heating source for non-contact and rapid heating. In addition to the real-time temperature sensing, PCR needs a rapid thermocycling for effective PCR. For a fast thermal response, the thermal mass of the reactor chamber is minimized by removal of bulk silicon volume around the reactor using double-side KOH etching. The transparent optical property of silicon in the infrared wavelength range provides an efficient absorption of thermal energy into the reacting sample without being absorbed by silicon reactor chamber. It is confirmed that the fabricated micro-reactor could be heated up in less than 30 sec to the denaturation temperature by the external infrared lamp and cooled down in 30 sec to the annealing temperature by passive cooling.

• 전기학회논문지
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• 제60권7호
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• pp.1391-1395
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• 2011

In this paper, would implement a transceiver for the visible light communication that based on wireless communication driving technology for LED illumination-based infrared ray communication, and measurement analyzed a design error rate of a transceiver variable rate has made about distance change -2.5m. The error rate measured a voltage variable along illuminate change between switchable circumstances, which has illuminated insight and outright. Each analyzed and measurement on the communication distance errors along the differences of disturbance light between night and days. The LED module has implemented for number of 6 through illumination dimming in case of different values. Also, implementation for the system module of a VLC transceiver based on the infrared sensors which used feedback outcome value has analyzed with error rate.