用于微波消解儀的熒光光纖測溫系統(tǒng)的研制

本文共計2894字；

摘要: 設(shè)計了一種用于微波消解儀的光纖熒光測溫系統(tǒng)。系統(tǒng)使用藍(lán)色發(fā)光二極管作為激勵光源，傳感器在由發(fā)光二極管發(fā)出的一系列光脈沖的激勵下，產(chǎn)生周期性的熒光衰落信號。這個信號經(jīng)探測后，首先經(jīng)過一個低噪聲寬帶放大器，然后再由系統(tǒng)對每一衰落曲線數(shù)字化。數(shù)字化后的采樣值經(jīng)校正了所有的偏置之后，由PC機處理，PC機將采用線性最小二乘曲線擬合技術(shù)，生成對這些數(shù)據(jù)的最佳指數(shù)擬合曲線，通過最佳擬合曲線求得指數(shù)衰落的時間常數(shù)。隨后再將時間常數(shù)與預(yù)先存儲的數(shù)據(jù)對照表做比較，以確定傳感器的溫度。
關(guān)鍵詞：熒光，光纖，測溫，微波消解，數(shù)據(jù)處理
The study of fluorescence optical fiber temperature measuring system for microwave digestion instrument

Abstract: A fluorescence optical fiber temperature measuring system applying to microwave digestion instrument has been designed. The blue LED is adopted as the excitation light source in this system. The sensor brings periodic fluorescence decay signal under the excitation of a series of light pulse from LED. After having been detected, the signal is amplified by a low noise wide band amplifier firstly. Then every decay curve is digitized. The method of least squares curve fitting is used to make the best exponential fitting curve with these data. Finally,

目錄：
1 熒光測溫機理
2 熒光光纖測溫系統(tǒng)組成
3 實驗
4 結(jié)論
參考文獻(xiàn):
[1] 周勇義,谷學(xué)新,范國強等.微波消解技術(shù)及其在分析化學(xué)中的應(yīng)用. 冶金分析,2004,4:30-36
(Zhou Y Y, Gu X X, Fan G Q et al. Application of microwave digestion in analytical chemistry. Metallurgical Analysis, 2004,4:30-36)11/24/2005
[2] 邵勁松,高芹.微波消解石墨爐原子吸收法測定大米中鉛鎘.糧食與食品工業(yè),2005,2:42-44
(Shao J S, Gao Q. Determination of lead and cadmium in rice by microwave digestion GF-AAS. Cereal and Food Industry,2005,2:42-44)
[3] 趙秀玲,白林.微波消解儀中的光纖傳感技術(shù).現(xiàn)代儀器,2004,4:33-34
(Zhao X L, Bai L. Fiber sensing technique in microwave accelerated reaction system, Modern Instrument,2004,4:33-34)
[4] D.P Jia, W Lin. A novel method of optical fiber temperature measurement — Measuring the inner temperature of the cage motor in starting. Proceeding of SPIE, 2000(4220):210～213