• 전자공학회논문지SC
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• 제43권1호
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• pp.1-6
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• 2006

경면물체의 형상과 두께를 측정하는데 있어 접촉식 센서가 가지고 있는 문제점을 해결하기 위해 홀로그램 레이저 다이오드와 자동 전력 제어를 이용하여 성능이 좋은 비접촉식 광센서를 개발하였다. 접촉식 센서에서는 센서 프로브가 측정 대상체와 계속해 접촉하므로 프로브의 마모로 인한 측정왜곡이 발생하게 된다. 이를 극복하기 위해 플라스틱렌즈와 CD 플레이어의 광학 픽업장치를 홀로그램 레이저로 구성하는 저가의 비접촉 센서를 제안한다. 비접촉식 광센서는 대상물체 쪽으로 움직이면서 포커스 에러 신호를 얻어 투명판의 형상과 두께를 측정할 수 있다. 센서 내부 온도를 ${\pm}0.1^{\circ}$ 제어한 상태에서 다수의 실험 측정을 수행하여 ${\pm}2{mu}m$의 측정 오차를 가지는 우수한 결과를 보이고 있다.

• 센서학회지
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• 제15권3호
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• pp.179-185
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• 2006

We have developed a noncontact temperature sensor using a silver halides infrared optical fiber. An infrared radiation from a heat source is transferred by a silver halides infrared optical fiber and measured by infrared sensors such as a thermopile and a thermal optical power-meter. The relationships between the temperature of a heat source and the output voltage of the thermopile and the optical power of a thermal optical power-meter are determined. The measurable temperature range using a thermopile and a thermal optical power-meter are from 100 to $750^{\circ}C$ and from 30 to $750^{\circ}C$ respectively. It is expected that a noncontact temperature sensor using infrared optical fiber can be developed for medical and industrial usages based on the results of this study.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.214-214
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• 2000

This paper deals with the non contact optical sensor to measure the shape of transparent plates such as glass panel of LCD(Liquid Crystal Display). The conventional methods to obtain the shape or thickness of a transparent plates are contact type sensor such as LVOT(Linear Variable Differential Transformer). Due to the contact between the tip of the sensor and the surface of objects, the tip is abraded. In addition, the high temperature glass casting makes the size of sensor body changed. These reasons makes the sensor degraded. In this paper, to overcome these problem, we proposed a low cost noncontact optical sensor this is composed of the Hologram laser unit of a CD-Pickup and a plastic lens. To evaluate the performance of the proposed optical sensor, a series of experiments were performed for various measurement condition. Based upon observation of the experimental result, the developed sensor shows good result for measuring the shape of transparent plates.

• 한국산학기술학회논문지
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• 제11권5호
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• pp.1730-1734
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• 2010

원전 2차계통수의 pH를 예측을 위해서는 샘플을 채취, 냉각시킨 후 pH를 측정하게 되는데 이 때 샘플의 온도는 pH를 변화시키는 중요한 요인이 된다. 본 연구에서는 할로겐화 은 광섬유를 이용하여 비접촉식 온도센서를 개발하였고, 열전쌍열을 이용하여 열원으로부터 방출되는 적외선을 측정하였다. 열원과 광섬유 끝단 사이의 거리 및 각도 변화에 따른 광섬유 온도센서의 출력신호를 분석하였으며, 광섬유 온도센서로 측정한 온도범위는 $25{\sim}60^{\circ}C$이다. 본 연구결과를 기초로 원전 2차계통수 pH 샘플의 온도를 측정하기 위해 할로겐화 은 광섬유를 이용한 비접촉식 온도센서의 개발이 가능할 것으로 기대된다.

• 대한의용생체공학회:의공학회지
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• 제27권6호
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• pp.337-342
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• 2006

We have developed a noncontact temperature sensor using a silver halide optical fiber. The infrared collimator and focus head are connected both ends of a silver halide optical fiber with SMA connectors and used to collimate radiations of a heat source and to focus them to infrared sensors such as a pyroelectric sensor and a thermopile sensor, respectively. The relation ships between the temperatures of a heat source and the output signals of the infrared sensors are determined to measure the surface temperature of a heat source. The measurable temperature range is from 25 to $60^{\circ}C$. It is expected that a noncontact temperature sensor using a silver halide optical fiber can be developed for medical usages such as temperature monitoring during hyperthermia, cryosurgery, laser surgery and diagnostic procedure based on the results of this study.

• Journal of Yeungnam Medical Science
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• 제41권1호
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• pp.53-55
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• 2024

A noncontact sensor field is an innovative device that can detect, measure, or monitor physical properties or conditions without direct physical contact with the subject or object under examination. These sensors use a variety of methods, including electromagnetic, optical, and acoustic technique, to collect information about the target without physical interaction. Noncontact sensors find wide-ranging applications in various fields such as manufacturing, robotics, automobiles, security, environmental monitoring, space industry, agriculture, and entertainment. In particular, they are used in the medical field, where they provide continuous monitoring of patient conditions and offer opportunities in rehabilitation medicine. This article introduces the potential of noncontact sensors in the field of rehabilitation medicine.

• 한국정밀공학회지
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• 제18권8호
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• pp.40-47
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• 2001

Optical measurement methods make it possible to detect object displacements with high resolution and noncontact measurements. Also, they are very robust against EMI noises and have long operation range. An optical triangulation sensor is one of widely used displacement measurement sensors for its sub-micron resolution, fast response, simple structure, and low cost. However. there are several errors caused by inclinations of a surface. speckle effects, power fluctuations of light sources, and noises of detectors. In this paper, in order to minimize error effects, we performed error analysis and proposed a new structure. Then, we setup a new modeling method and verify it through simulations and experiments. Based on the new model. we propose a new sensor structure and establish design criteria. Finally, we design a signal processing system to overcome a resolution-limited problem of light detectors. The resolution of the proposed system is 0.2${\mu}{\textrm}{m}$ in 5mm operating range.

• 한국광학회:학술대회논문집
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• 한국광학회 2006년도 하계학술발표회 논문집
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• pp.543-544
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• 2006

• 센서학회지
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• 제17권6호
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• pp.397-405
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• 2008

In this study, we have measured temperature distribution using infrared optical fibers during radiofrequency ablation (RFA). Infrared radiations generated from the water around inserted electrode are transferred by silver halide optical fibers and are measured by a thermopile sensor. Also, the output voltages of a thermopile sensor are compared with those of the thermocouple recorder. It is expected that a noncontact temperature sensor using an infrared optical fiber can be developed for the temperature monitoring during RFA treatments based on the results of this study.

• 한국광학회지
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• 제14권3호
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• pp.260-265
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• 2003

미세하게 진동하는 물체의 변위를 비접촉식으로 측정할 수 있는 광학계를 설계하고 제작하였다. 도플러효과에 의한 방법과는 달리, 하나의 볼록렌즈를 이용하여 물체 표면에 비스듬하게 입사하여 물체 표면에서 반사되는 광점의 위치 변화를 PSD(position-sensitive detector)로 검출하였다. 이러한 방법으로 전체적인 장비의 크기를 작게 하였고 빠른 응답 속도를 구현하였다. 본 장비는 $\pm$1.0 $\mu\textrm{m}$의 분해능을 나타내었으며, 스피커의 진동 실험 및 CD-ROM안에서 회전하는 C교의 진동을 측정하였다.