Sensitivity Improvement of Laser Microphone Using Self-coupling Effect of Semiconductor Laser

カテゴリ: 論文誌(論文単位)

グループ名: 【E】センサ・マイクロマシン部門

発行日: 2018/01/01

タイトル(英語): Sensitivity Improvement of Laser Microphone Using Self-coupling Effect of Semiconductor Laser

著者名: Daisuke Mizushima (Aichi Institute of Technology), Takeshi Yoshimatsu (Aichi Institute of Technology), Tsuyoshi Yamaguchi (Mitsubishi Space Software Co., Ltd. Chubu-Office), Michihiro Aoki (Aichi Institute of Technology), Norio Tsuda (Aichi Institute of T

著者名(英語): Daisuke Mizushima (Aichi Institute of Technology), Takeshi Yoshimatsu (Aichi Institute of Technology), Tsuyoshi Yamaguchi (Mitsubishi Space Software Co., Ltd. Chubu-Office), Michihiro Aoki (Aichi Institute of Technology), Norio Tsuda (Aichi Institute of T

キーワード: Laser microphone，Self-coupling effect，Semiconductor laser，Distributed feedback laser，Sensitivity improvement

要約(英語): A laser microphone that uses the self-coupling effect of a semiconductor laser is an optical microphone. It has excellent characteristics, such as a wide and flat frequency characteristic. However, as a laser microphone has a large noise component in its output, the signal-to-noise ratio is low. Therefore, the sensitivity of a laser microphone is not sufficiently high for practical use. In this work, two methods to improve the sensitivity of a laser microphone are proposed. The first method uses a sound collector that collects widespread sound waves on a laser beam. The second method uses a right-angle prism that extends the light path. By using a sound collector, the sensitivity can increase up to nine times and the signal-to-noise ratio increases up to six times. However, the sensitivity decreases for frequencies below 10 kHz, and the directivity has a sharp peak. By using a right-angle prism, the sensitivity increases up to three times and the signal-to-noise ratio increases up to six times. In addition, the sensitivity can be improved while maintaining the wide and flat frequency characteristics and the wide directivity.

本誌: 電気学会論文誌E（センサ・マイクロマシン部門誌） Vol.138 No.1 （2018） 特集：センサ・マイクロマシン英文特集号

本誌掲載ページ: 2023/09/14 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejsmas/138/1/138_9/_article/-char/ja/