法國國家玻璃和陶瓷實驗室主任章向華教授到北理工做學術報告
發布日期：2017-05-16 供稿：王輝 攝影： 郭巍
編輯：趙汗青 審核：劉艷 閱讀次數： 
2017年5月11日，應北京理工大學材料學院沖擊環境材料技術國家級重點實驗邀請，法國雷恩大學--法國國家研究中心玻璃和陶瓷實驗室主任章向華教授（法國國家科研中心一級主任研究員）訪問材料學院，并做了題目為“Glass and ceramics for imaging beyond the visible”的學術報告。北京理工大學材料學院院長助理張加濤教授，重點實驗室朱時珍教授以及學院和實驗室其他老師和研究生們參加了此次報告會。
章向華教授在國際多種專業雜志上發表科技論文280篇，在紅外玻璃研究與開發方面獲得16項專利，被邀請在70次國際學術會議上作特邀報告。獲得法蘭西科學院院士評選的 EADS(空客集團) 大獎，法蘭西科學院院士評選 Ivan Peches 大獎，促進科技研究中法協會JX International 科技應用獎，法國國防部“國防革新”獎，IBM青年科學家獎等。
報告中，章向華教授詳細地介紹了紅外玻璃和陶瓷研究及在在紅外成像方面的應用，報告深入淺出，并與在座的師生展開廣泛而深入的交流，大家爭相提問，現場氣氛熱烈。最后北京理工大學材料學院向章向華教授贈予紀念品，全體師生合影留念。此次報告圓滿完成。
報告摘要： The visible range is a small part of the electromagnetic spectrum. Imaging beyond this range, in the infrared region for example, can give much additional information. There are however very few materials transparent in the 8-12 μm region, which is the most used window for thermal imaging (night vision) as it corresponds to the maximum emission of bodies at room temperature. Germanium, a rare and expensive element, has very interesting optical properties with very high refractive index and very low chromatic dispersion between 8-12 μm. Another mostly used material is the polycrystalline ZnSe that is produced with the long and expensive CVD (Chemical Vapour Deposition) technique.
Chalcogenide glasses are glasses based on sulfur, selenium and tellurium. They have been intensively studied mainly due to its large optical transmission window from the visible to far infrared region. Sulfide glasses are typically transparent from 0.5 μm to 11 μm, selenide glasses from 1 μm to 14 μm and telluride glasses from 2 μm to 18 μm. Potential and current applications include optics for night vision, infrared laser power delivery, remote chemical and biological sensing. The main advantage of these glasses, compared to germanium and ZnSe is the possibility of obtaining glass fibres and complex optical components by moulding thanks to their vitreous nature Sulfide ceramics present much better mechanical and thermal resistance. They are especially useful in harsh environment where resistance to high temperature or/and erosion is needed.
The preparation, properties and applications of these infrared transmitting materials will be discussed.
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