本研究主要研發一量測外部環境折射率變化之結合光纖錐形結構之光纖式折射計。錐形結構之麥克森式干涉儀的原理主要是藉由錐形結構造成分光之效果；而將錐形結構之後的光纖保護層(Jacket)剝除後，光纖外部的折射率變化會造成光纖包層(Cladding)之有效折射率產生變化，進而影響分光之後的多道光有光程差變化之現象，而多道光由光纖末端之鏡面反射回光纖錐形結構之後將再度結合，藉由其多道光之干涉訊號可以分析其外部折射率變化與反射光干涉頻譜飄移的關係。本研究利用此錐形結構之麥克森式干涉儀結合已發展之PMDI (Path Matched Differential Interferometry) 干涉技術；此新式架構運用兩個干涉儀，麥克森與法布立-培若干涉儀所組成，藉由分析光接收器的接收到之調變訊號，以及解調技術之運用，解析外部的折射率變化與接收到訊號之相位變化的關係。

In this study, a method for measuring refractive index of the media base on abrupt taper Michelson interferometer is proposed. The basic principle of optical interferometers is based on overlap of the two optical signals at the same wavelength but different optical path that is induced through travel in different media or along different path lengths. Implementing this method into a path-matching differential interferometer (PMDI) consisted by two kinds of different interferometer, abrupt taper Michelson and Fabry-Perot interferometer, respectively. The PMDI is applied to measure refractive index change of the water solution. By analyzing the optical signal of the optical detector by new synthetic heterodyne demodulation can clearly realize the relation between the phase change and refractive index of the solution.

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