研究生: |
楊永瑞 Yong-Ruei Yang |
---|---|
論文名稱: |
以表面聲波震盪電路為基礎之生化感測系統 Bio-chemical sensing system based on surface acoustic wave oscillator |
指導教授: |
饒達仁
Da-Jeng Yao |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 奈米工程與微系統研究所 Institute of NanoEngineering and MicroSystems |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 132 |
中文關鍵詞: | 表面聲波元件 、表面聲波震盪器 、S參數 、高頻量測 |
外文關鍵詞: | SAW device, SAW oscillator, S parameter, high frequency measurement |
相關次數: | 點閱:2 下載:0 |
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微小化、仿生化是目前生化感測器之發展重點,表面聲波元件有高靈敏度、高Q值與高訊號/雜訊比,且易與IC製程整合等等的特性。因此,近年來許多學者除了將其運用於通訊系統外,也利用其優點發展為高靈敏度之生化感測器。並因其反應時間短且回復性佳,可用於即時偵測之感測器。為提高其吸附氣體之選擇性與靈敏度,選用高選擇性之高分子為吸附薄膜,且與高頻電路與量測設備結合,做為後端的監控與量測。本文以100MHz之表面聲波元件為基礎,外加回授放大電路構成震盪電路,利用此電路進行仿生電子鼻之量測,並於後端使用計頻器(universal counter)量測頻率訊號之變化。爲了使後端監控與訊號的量測可以更準確,利用GBIP介面卡與電腦作連結,並利用visual basic進行儀控與訊號擷取。
經本文之理論與實驗驗證,基材為128° YX-LiNbO3所製作出之SAW感測元件,中心頻率(center frequency)為97.95MHz、插入損失(Insertion loss)約為-8.53dB,與sidelobe rejection約26dB。而震盪器操作頻率約為97.8MHz、週期為10.22 ns、Vp-p=3.212V,其基頻載波功率約為10.53 dBm。而利用本系統進行量測,搭配感測薄膜為Calix[6]arene、Fe(Ⅱ) protoporphyrin IX chloride與polyaniline nanofibers對胺類氣體有非常好之選擇性。
Miniaturization and bionics are the key point to recent development of bio-chemical sensor. Acoustic surface wave device has great performance on high sensitivity, quality factor and signal/noise ratio. And it’s also easy to integrate with IC process. Therefore, many scholars not only use it in communication system but also in bio-chemical sensor. Because of high sensitivity, it was usually used as real time sensing system. In order to increase selectivity and sensitivity of system, polymers with high selectivity were chosen as sensing film. Finally, high frequency circuit, and measurable equipment were combined with it for signal processing. In this thesis, high frequency SAW device were chosen as sensing chips and external feedback amplifier circuit of wide bandwidth were combined with it to construct oscillator circuit. This circuit was used as bionic E-nose for sensing target molecular of gas, and output signals were measured by the frequency counter (Agilent 53131A). For precisely controlling, GBIP card was adopted to connect computer, and monitoring program (visual basic) was using to control the computer.
According to the theory and experimental verification, 128° YX LiNbO3 with high K2 value was chosen as sensing substrate. Center frequency of SAW device was 97.95MHz, insertion loss was -8.53dB, and sidelobe rejection was 26dB. The operation frequency of oscillator was 97.8MHz, period was 10.22 ns, and voltage of peak to peak value was 3.212V. Finally, the carrier power of fundamental frequency was 10.53 dBm. The SAW oscillator sensing system using high sensitivity and selectivity polymers, such as p-tert-butylcalix[6]arene, Fe(Ⅱ) protoporphyrin IX chloride, polyaniline nanofibers, was good for sensing amine vapor.
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