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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Wood's glass ： ウィキペディア英語版 Wood's glass Wood's glass is an optical filter glass invented in 1903 by American physicist Robert Williams Wood (1868–1955) which allows ultraviolet and infrared light to pass through while blocking most visible light. It was developed as a light filter used in communications during World War I. His "invisible radiation" technique worked both in infrared daylight communication and ultraviolet night communications. His glass filter removed the visible components of a light beam, leaving only the "invisible radiation" as a signal beam. Wood's glass has been commonly used to form the envelope for fluorescent and incandescent ultraviolet bulbs ("black lights"). In recent years, due to its disadvantages, other filter materials have largely replaced it (see below).〔"''() BLB () has a thin coating of a visible wavelength (VIS) filter generally applied to the inner wall of the bulb.''" , p.〕 ==Composition== Wood's glass is special barium-sodium-silicate glass incorporating about 9% nickel oxide. It is a very deep violet-blue glass, opaque to all visible light rays except longest red and shortest violet. It is quite transparent in the violet/ultraviolet in a band between 320 and 400 nanometres with a peak at 365 nanometres, and a fairly broad range of infrared and the longest, least visible red wavelengths. Some sources erroneously state presence of cobalt(II) oxide in Wood's glass. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wood's glass」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.