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동경과학제전 출전실험의 연구개발

동경과학제전 출전실험의 연구개발. 동산중학교 교장 김 창 연. ( 실제 모습 ). ( 최종 장치도 ). ( 채널 A, B 합성 맥놀이 ). A : 도르래 B : string C : 아크릴 원통 D : 볼베어링 G₁,G₂: guide(in, out) S₁,S₂,S 3 : stopper. Applications. Fiber optic Sensors: Why?. Small size Great variety in the measurable parameters

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동경과학제전 출전실험의 연구개발

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  1. 동경과학제전출전실험의 연구개발 동산중학교 교장 김 창 연

  2. (실제 모습)

  3. (최종 장치도)

  4. ( 채널 A, B 합성 맥놀이)

  5. A : 도르래 B : string C : 아크릴 원통 D : 볼베어링 G₁,G₂: guide(in, out) S₁,S₂,S3 : stopper

  6. Applications

  7. Fiber optic Sensors: Why? • Small size • Great variety in the measurable parameters • Insensitive to external perturbations • Reliability in demanding environments • Long-distance remote monitoring • Compatible with data-transmission network

  8. C.M.P. Functioning principle

  9. Multiplexed Sensors N sensors, N wires, N calibration Temperature monitoring of numerous points

  10. Scattering processes Laser, lo

  11. Temperature monitoring Setup of the sensing fiber in the concrete layer (15m x 20m)

  12. Brillouin-based distributed sensor Based on the use of a probe signal which wavelength is precisely controlled and scanned Record probe intensity while its wavelength is scanned

  13. Complete gain profile (frequency response) Frequency scan Intensity Distance, km Frequency, GHz

  14. Dangerous slope monitoring • Optical fiber attached to polls anchored in the ground • Monitoring of the optical fiber deformation in relation with the land slide

  15. Brillouin The frequency shift of the reflected light depends on the fiber strain and temperature

  16. Horw Piles

  17. Measurable Parameters • Strain • Deformations • Forces • Temperature • Chemical concentration • Accelerations • Rotations • Electric fields, currents,…

  18. transmitted light optical fibre incoupled light backscattered light Is Ia intensity T backscattering spectrum wave length The measuring method of the distributed fibre optical temperature sensing technique (DTS-technique)

  19. Mirrors Measurement Fibre Reference Fibre Steel Tube (f12/16) Plastic Tube Reference Fibre Measurement Fibre Coupler Connector Coupler Connector Passive Zone Active Zone Anchor Pieces (20cm - 10m) (Unlimited) Standard Sensor Stiff Sensor – Design Passive Zone Active Zone Stiff Sensor

  20. Maximum absorbance Structuring for less reflection Most rays reflect twice: R  R2 pyramids

  21. Si n = 3.6 Maximum absorbance Antireflection coating Reflectance Destructive interference between 1 and 2: Wavelength [nm]

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