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Development Of New Improved Model Structure SPR Sensor And Detection Application Based On Fiber-optic

Posted on:2013-02-21Degree:MasterType:Thesis
Country:ChinaCandidate:L H FengFull Text:PDF
GTID:2298330422979809Subject:Measuring and Testing Technology and Instruments
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Surface Plasmon Resonance (SPR) sensors, which are extremely sensitive to small changes ofdielectric compositions around them, have been applied to many fields from biomedicine toenvironmental monitoring. In1990s, SPR sensor based on Fiber-optic (F-O SPR) was invented for thefirst time, it combined high sensitive SPR technology with Fiber-optic transmission technology,showing great advantages of anti-interference, micro sample measurement, on-line monitoring andlow cost. Now, developing the F-O SPR sensor with a higher sensitivity, flexibility and practicabilityis becoming a hot topic. There are four parts in this paper as following:Firstly, based on the SPR sensing principle of Kretschmannn model and Otto model, we exploredthe math theory and probe structure of F-O SPR sensor, and then both new improved design ofTapered structure and D-type probe are proposed. So do the resonance excitation characteristics.Secondly, the finite difference time domain of prime SPR model and fiber-optic SPR model aresimulated in this paper. The simulation illustration of surface plasmon resonance from various aspectsshows the validity and feasibility of the series prime SPR sensor. Both Tapered-type and D-typestructure laylout are established and calculated by Opti-FDTD, which provide the numerial foundationfor actual experiment and manufacture.Thirdly, Preparation methods and processing technology of F-O SPR sensor are improved. Weinvestigated double sided polishing method to manufacture both Tapered-type and D-type F-O SPRsensors. Performance testing and experiment analysis show that the SPR sensors’ sensitivity areimproved because of the adding reflecting mirror and physical vaporous deosition.Finally, a novel method based on surface plasmon resonance spectral analysis of a fiber opticsensor probe is developed for detection of Total Dissolved Solid (TDS) in natural water. We studiedthe SPR spectral difference between seven ionic and three non-ionic liquid samples experimentally.for the same refractive index of solutions, resonance wavelength is much higher for ionic samplesthan that in the case of non-ionic one because of the influence of ions so that response curve can beestablished for TDS detection in water.
Keywords/Search Tags:surface plasmon resonance, optical fiber sensor, finite difference time domain, Fiber-optic SPR spectrum, TDS measurement
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