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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/50803
Title: | 酒精偵測系統 Alcohol Detector System |
Authors: | Chen-Hao Guo 郭宸豪 |
Advisor: | 李嗣涔(Si-Chen Lee) |
Keyword: | 表面電漿子,酒精偵測,紅外線發光元件,紅外線光偵測器, Surface plasmon,the alcohol detection,infrared thermal emitter,infrared photodetector, |
Publication Year : | 2016 |
Degree: | 碩士 |
Abstract: | 本論文主要研究利用三波段窄頻紅外線發射器以及室溫可操作的窄頻紅外線偵測器來實現三波段的酒精偵測系統。主要構想為藉由偵測酒精在中紅外光的兩個窄頻吸收以及一個不會受到酒精影響的波段來當作參考的信號使得整個氣體偵測系統可靠度更高。
我們在一波導型窄頻紅外線發射器上方製作矩形金屬結構,而且這個矩形具有兩種不同的線寬。利用下方的波導模態以及上方的兩個侷域型模態來實現三波段的窄頻紅外線發射器。藉由探討覆蓋於窄頻紅外線偵測器上的非晶矽薄膜厚度與波長紅位移的關係來微調所要的偵測波段以及製作不同的窄頻紅外線偵測器。除此之外也利用波導模態來實現中紅外波段中波長較短的窄頻偵測器。 我們設計一個偵測系統來量測不同酒精濃度,包含發射器腔體、氣體腔體、偵測器的載具以及上述的窄頻紅外線發射器與偵測器。系統大小約為6 公分 × 6 公分 × 15公分。當腔體的長度為10公分以及輸入功率為4瓦時,我們順利地偵測到0.5%的酒精濃度。利用不受酒精影響的特性,當作參考信號用的偵測器可以使整個氣體偵測系統可靠度更高。 In this thesis, the alcohol detector system with triple-wavelength detection is demonstrated by means of narrow bandwidth triple-wavelength thermal emitter and corresponding narrow bandwidth plasmonic photodetectors. In addition to detecting the two absorption of the alcohol in mid-infrared spectrum, a reference signal which would not be absorbed by the alcohol makes the whole system more reliable. Firstly, an island-like gold film with two widths is fabricated on top of a waveguide mode thermal emitter. With one waveguide mode generated from the bottom and two localized surface plasmon (LSP) modes generated from the top, the triple-wavelength thermal emitter can be realized. By controlling the thickness of a-Si:H film on top of the plasmonic photodetector, the specific wavelength detection can be carried out. With waveguide mode photodetector, the short wavelength detection can be achieved. By designing an emitter chamber, a gas chamber, a detector holder and the devices discussed above, an alcohol detector system with triple-wavelength detection is carried out. The size of the system is about 6 cm × 6 cm × 15 cm. For the chamber length equal to 10 cm and input power of 4 W, 0.5% alcohol concentration is successfully detected. Besides, the reference detector can be used to make the whole system more reliable. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/50803 |
DOI: | 10.6342/NTU201600767 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 光電工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-105-1.pdf Restricted Access | 3.71 MB | Adobe PDF |
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