User:Sgchen

Distributed Feedback (DFB) Fibre Laser for Sensing

First optical fibre sensor demonstrated in the late 1970s. Since then numerous works have been done. The advantages of optical fibre sensor are: 1. Electrically passive nature; 2. Ability to multiplex large number of sensors onto a single optical fibre; 3. Design flexibility; 4. Immunity to electromagnetic interference; 5. Highest strain, temperature and acoustic pressure sensitivity.

DFB is a type of laser which has a very narrow line-width and hence provides long coherence length, stabilized output power. Therefore, it becomes a candidate for sensing applications. This is a very promising area for industrial development and commercialization. My research goal is to design, develop and test highly sensitive fibre laser based sensor system such as strain sensor, fibre laser hydrophone, etc. Here at UNSW Photonics Research Group, we own the state-of-the-art equipment that allow us to develop many types of practical and prototype techniques for design and testing these sensors. These sensors can be used in many industrial fields such as: Industrial manufacturing-product quality control; civil engineering-structural health monitoring; environment protection-air quality control & chemical particle detection; geophysical survey-mining exploration & spatial surveying; and biomedicine -monitoring blood pressure & body temperature; military technology-underwater surveillance (hydrophone), etc.

References

1. G.D. Peng & P.L. Chu: Chapter 9, Optical Fiber Hydrophone Systems, 2002. 2. P. Nash: Review of interferometric optical fibre hydrophone technology, IEE Proc.-Radar, Sonar Navig., Vol. 143, No.3, June, 1996. 3. Francis T.S.Yu, Shizhuo Yin  ed. (2002). Fibre optic sensors. Marcel Dekker, Inc. USA. 4. Lee, C. E., J. J. Alcoz, et al. (1992). Optical fiber Fabry-Perot sensors for smart structures, Alexandria, VA, USA, IOP Publishing 5. C.D. Butter et al. (1978).” Fiber optics strain gauge.” Appl.opt. Vol. 17, No.18. 2867-2869. 6. G.B. Hocker. (1979). “Fiber-optic sensing of pressure and temperature.”Appl.Opt. Vol. 18, No. 9. 1445-1448.