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Optical System Design and Experimental Demonstration of Long-range Reflective-type Precision Displacement Sensors

반사형 장거리 정밀 변위 감지기용 광학계 설계 및 측정

  • 임재인 (인하대학교 광자과학연구실) ;
  • 김승환 (인하대학교 광자과학연구실) ;
  • 이승훈 (인하대학교 광자과학연구실) ;
  • 정해원 (인하대학교 광자과학연구실) ;
  • 이민희 (인하대학교 광자과학연구실) ;
  • 김성환 (한진데이타) ;
  • 김경헌 (인하대학교 광자과학연구실)
  • Received : 2011.04.14
  • Accepted : 2011.05.03
  • Published : 2011.06.25

Abstract

This paper reports design and demonstration of optical systems for reflective-type remote optical displacement sensors. Optical systems for light illumination sources and a position sensitive detector (PSD) for the displacement sensor were developed to sense displacement of bridges and instability of skyscrapers in a distance range from 10 m to 250 m to an accuracy better than a few mm. Performance of the optical systems was verified by composing a displacement sensor and by using it in measurement of displacement of a remote target with proper reflective optics depending on distance. The displacement sensor was composed of two LED light sources, each with collimating optics, and a two-dimensional PSD with telescope-type optics. Its displacement resolutions was measured to be 0.1 mm at a distance of 10 m and less than 3 mm at a distance of 250 m.

본 논문에서는 반사형 장거리 정밀 변위 감지기용 광학계를 설계하고 실제 구성을 해 봄으로써 작동 성능을 측정한 결과를 소개하고자 한다. 10 m ~ 250 m 거리에 있는 교량 및 건축물 등의 진동 및 변위를 감지하는 장거리 변위 감지기용 광신호 송신 및 수신용 광학계를 설계하고, 관측 거리에 따라 관측 대상체에 다양한 반사광학계를 설치하여 실제 제작된 변위 감지기의 변위 감지 분해능을 측정하였다. 광신호 송신부는 두 개의 850 nm 파장대 LED와 수렴광학계로 구성되고, 수신부에서는 위치 센서(PSD: Position Sensitive Detector)와 망원형 수렴광학계가 사용되었다. 관측 대상체의 거리에 따라 10 m 거리에서는 0.1 mm 변위 분해능과 250 m 거리에서는 3 mm 이하의 변위 분해능이 가능함을 확인하였다.

Keywords

References

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