波長掃描D型光纖感測器之應用研究

Study on wavelength-scanning D-type optical fiber sensor and its applications

邱柏瑾(Po-Chin Chiu)

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2007年)

摘要

本研究D-type光纖感測器是利用衰減全反射（attenuated total reflection ATR）與光譜分析（optical spectrum analyzer）的方法來作應用研究，能提高靈敏度與解析度。將光纖鍍上金膜，由多波段光（400~1300nm）入射至光纖內的特定角度為89°，光在光纖中前進，並進入外面鍍有金膜的感測區，於是漸逝波穿過金屬層，一但表面電漿波（SPW）和其傳導模式相位匹配即可激發表面電漿共振（SPR）。波長最小解析度為0.01nm。在待測折射率1.33~1.48，解析度為10-5 ~10-6。
1. 利用光譜分析的方法對於外部待測液體或是氣體折射率變化的檢測，可觀察出折射率變化時，光強度也會隨著變化以及表面電漿共振波長吸收谷偏移。最佳之解析度為7.59x10-6。
2. 以及利用光譜分析的方法，來進行對待測液體或是氣體的溫度變化作即時的檢測，經由溫度的改變，光強度比值最低點所對應的波長也會隨著改變。溫度範圍在25℃~75℃，其溫度解析度為0.01~0.02℃。
本感測器主要用於即時偵測液體的折射率及濃度，同時具有體積小、架構簡單、價格便宜等優點，未來可應用在環境、化學、生物細胞樣品的檢測方面。

並列摘要

Abstract---A D-type optical fiber sensor based on the attenuated total reflection (ATR) effect and spectrum technique at a specific incident angle（89°） is presented. It is coated with an Au-film to detect the refractive variation by measuring the output spectrum.
1. Calculate the reflectance ratio of the specimen to water could look out for the resonant wavelength and the refractive index. The proposed method is used to enhance the measurement sensitivity and achieve the resolution better than 10−5 (RIU). Resolution of the OSA is 0.01 nm.
2. An application of D-type optical fiber sensor in the temperature measurement is proposed. The sensor based on surface plasmon resonance could be like as a probe to sense the liquid or gas temperature in real-time. We use the optical spectrum method to analyze and record the temperature. It has some merits, such as, simple, high sensitivity, and in vivo test.
The spectrum method measured at a specific incident angle would enhance the sensitivity was demonstrated. It is very useful in applications of chemical, physical or biological measurements.

Keywords: surface plasmon resonance (SPR), optical fiber sensor (OFS)

參考文獻

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