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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 Spherical surface Acoustic Wave (SAW) sensor ： ウィキペディア英語版 Spherical surface Acoustic Wave (SAW) sensor Spherical surface acoustic wave sensors use a type of Surface Acoustic Wave (SAW) that travels along the surface of a medium exhibiting elasticity with exponentially decaying amplitude along depth. MEMS-IDT technology allows the use of SAW waves to sense various gases. Sensitivity up to 10 ppm of hydrogen using a spherical Ball SAW device is obtained.〔Proceedings of 20th International Congress on Acoustics, ICA 2010 23–27 August 2010, Sydney, Australia.〕 ==Principles== Conventional planner SAW sensors are based on principle that the parameters such as amplitude, speed and phase of Surface acoustic wave changes on adsorption of gas molecules. Limitation of planner SAW based sensors is that the change in above mentioned parameters is very small due to limited path offered to Surface acoustic wave by planer sensor. In case of Spherical sensors surface acoustic wave make several round trips along the equator of a ball as shown in fig, which offer longer paths to Surface acoustic wave hence even smaller change in parameters is amplified with multiple turns, which increases the sensitivity of the sensor considerably. 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「Spherical surface Acoustic Wave (SAW) sensor」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.