本文關(guān)鍵詞： 超聲 兩相流 多通道 圖像閾值　出處：《工程熱物理學(xué)報》2016年04期 　論文類型：期刊論文

【摘要】：本文分析了單一透射式和反射式超聲過程層析成像(UPT)的圖像閾值對成像質(zhì)量的影響和最優(yōu)圖像閾值的不確定性。通過將透射式UPT作為成像的基礎(chǔ),同時將反射重建圖像作為補充信息,提出了一種結(jié)合透射式和反射式的雙模式UPT,實現(xiàn)了連續(xù)成像時的圖像閾值優(yōu)化。設(shè)計基于以太網(wǎng)通訊的數(shù)字式8通道超聲波發(fā)射、接收和自動切換系統(tǒng),實現(xiàn)了自動扇形束掃描的工作模式,從而構(gòu)建了一套運用于兩相流動實時成像的數(shù)字化超聲層析成像系統(tǒng)。利用該系統(tǒng)分別進(jìn)行了管內(nèi)氣液分層流動和轉(zhuǎn)動雙圓柱的動態(tài)成像實驗,結(jié)果表明,提出的雙模式成像方法能自動給出合理的流型識別。
[Abstract]:In this paper, the influence of image threshold on imaging quality and uncertainty of optimal image threshold of single transmissive and reflective ultrasonic process tomography (UPT) are analyzed. The transmission UPT is used as the basis of imaging. At the same time, the reflection reconstruction image is taken as supplementary information, and a dual-mode UPTs combining transmission and reflection is proposed to optimize the image threshold in continuous imaging. A digital 8-channel ultrasonic emission based on Ethernet communication is designed. The receiving and automatic switching system realizes the working mode of automatic sector beam scanning. A digital ultrasonic tomography system for real-time imaging of two-phase flow is constructed, and the dynamic imaging experiments of gas-liquid stratified flow and rotating double-cylinder in the tube are carried out by using the system. The results show that, The proposed dual-mode imaging method can automatically give reasonable flow pattern identification.
【作者單位】： 上海市動力工程多相流動與傳熱重點實驗室(上海理工大學(xué))上海理工大學(xué)顆粒與兩相流測量研究所;
【基金】：自然科學(xué)基金項目(No.51176128) 上海市教委重點項目(No.12ZZ142)
【分類號】：O359
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本文編號：1526928