6ES79548LL020AA0
6ES79548LL020AA0
6ES79548LL020AA0
6ES79548LL020AA0
受控核聚變物理實驗是對人類未來新能源的探索，中國科學(xué)院等離子體物理研究所的HT－7超導(dǎo)托卡馬克裝置是我國第一個超導(dǎo)托卡馬克核聚變實驗裝置。而水冷石墨限制器則是該裝置的重要組成部分之一，它是放電過程中，等離子體所直接接觸的部件。限制器表面溫度變化是由等離子體能量沉積引起的一種表現(xiàn)形式，當限制器受到等離子體高能轟擊時，溫度便急劇上升。因此，在等離子體放電過程中實現(xiàn)限制器表面溫度的實時與連續(xù)采集，對于分析能量沉積、判斷等離子體的位移偏差有著重要的作用。本文從工程應(yīng)用的實際出發(fā)，介紹了一種靈活可靠、方便易用的數(shù)據(jù)采集和管理系統(tǒng)。該系統(tǒng)實現(xiàn)了微弱信號的高精度實時采集；建立了局域網(wǎng)內(nèi)不同系統(tǒng)間的通信連接；解決了海量數(shù)據(jù)的按次自動存儲與快速查詢的問題。
2 系統(tǒng)的構(gòu)建
2.1系統(tǒng)的特點及功能要求
（1）監(jiān)測界面
在HT－7托卡馬克裝置中，環(huán)向、極向限制器依不同的方位分布在真空室器壁之上。要求系統(tǒng)監(jiān)測界面突出顯示測量點的相對位置，從時空上均能觀察到對應(yīng)點的溫度。
（2）高精度快速采集
限制器的溫度變化通過WRKK凱裝熱電偶 （鎳鉻－鎳硅型）來測量，該熱電偶的反應(yīng)時間為100ms，輸出2～50mv微弱電壓信號。要求采集系統(tǒng)以毫秒級的巡檢周期實現(xiàn)對多路（64點）弱信號的實時準確采集。
（3）數(shù)據(jù)管理
HT-7實驗以炮號作為每次脈沖放電的記錄號。要求數(shù)據(jù)能按炮號存入數(shù)據(jù)庫中，系統(tǒng)可以自動將每炮數(shù)據(jù)創(chuàng)建為獨立的文件，并實現(xiàn)快速查詢的功能，同時文件的存儲形式要有利于數(shù)據(jù)的分析。
（4）網(wǎng)絡(luò)通信
限制器溫度采集計算機位于HT－7控制子網(wǎng)內(nèi)，數(shù)據(jù)的存儲要受總控放電時序的控制，放電炮號的獲取要訪問炮號服務(wù)器，放電脈沖長度要訪問總控計算機。因此要求該系統(tǒng)應(yīng)具有可靠的網(wǎng)絡(luò)通信功能。
（5）抗干擾能力
裝置放電運行和實驗期間有較強的電磁幅射存在。為了保證弱電信號采集的準確度，要求系統(tǒng)具有抗干擾能力。
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