Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Design Model of Intensity Modulation Type Displacement sensor Using Step-index Multimode Optical Fiber

스텝 인덱스 멀티모드 광섬유를 이용한 광강도 변조방식 변위센서 설계모델 연구

  • Shin, Woo-Cheol (Intelligent Machine Systems Center, Korea Institute of Machinery and Materials) ;
  • Hong, Jun-Hee (Department of Mechanical Engineering, BK21 Mechatronics Group at Chungnam National University)
  • 신우철 (한국기계연구원 지능기계연구센터) ;
  • 홍준희 (충남대학교 기계공학과 BK21 메카트로닉스 사업단)
  • Published : 2006.12.25
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Abstract

An optical fiber displacement sensor has the advantages of relatively simplicity, cheap, small probe size and immunity against environmental perturbation. The working principle of the sensor is based on the intensity modulation that is detection light intensity reflecting from the surface being measured. This paper presents the mathematical model of displacement measurement mechanism of this sensor type. The theoretical and experimental data are compared to verify the model in describing the realistic approach to sensor design. Finally, the analysis results show that displacement response characteristics such as sensitivity, measuring range are easily modified by principal design parameters such as magnitude of optical Power, diameter of optical fiber core and distance between transmitting fiber and receiving fiber.

본 논문은 광강도 변조방식 광섬유 변위센서의 측정 메커니즘을 수식적으로 모델링하여 측정영역과 감도를 원하는 목적에 따라 유연하게 조정할 수 있는 설계모델을 제안하고 있다. 유도된 모델은 스텝 인덱스 광섬유를 적용한 경우로 제한되고 광섬유 센서의 변위 응답영역 중 front slope 측정영역 해석에 초점을 맞추었다. 또한 광섬유 설계 시 유도된 모델 적용이 용이하도록 수치적분 방식의 해석 프로세스를 소개하고 있다. 제안된 모델과 프로세스는 기본 설계변수 별로 실험결과를 통해 비교검증 되었다. 끝으로 검증된 모델을 통해 기본 설계변수에 따른 광섬유 변위센서의 변위응답 특성 경향을 분석하였다.

Keywords

References

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