高速レーザビーム走査型管路検査装置におけるレーザパワー制御

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: 2011/11/01

タイトル(英語): Laser Power Control in a Pipe Inner Wall Inspection System with High-Speed Laser Beam Scanning

著者名: 小川 茂樹（東北大学大学院工学研究科ナノメカニクス専攻），桑野 博喜（東北大学大学院工学研究科ナノメカニクス専攻）

著者名(英語): Shigeki Ogawa (Tohoku University, Graduate School of Engineering), Hiroki Kuwano (Tohoku University, Graduate School of Engineering)

キーワード: 管路検査，レーザパワー制御，レーザビーム走査　　pipe inner wall inspection，laser power control，laser beam scanning

要約(英語): The high-speed, rotational scanning of laser beam was applied to the pipe inner wall inspection system that measures the cross-sectional shape of the pipes based on triangulation. The system is mainly composed of the laser diode (LD) and a position sensitive device (PSD) that goes through inside the pipe to obtain three-dimensional cross-sectional image. Since the reflectivity of the light from LD varies with pipe's inner conditions, simultaneous control of the PSD's receiving light level and the LD light maximum intensity is required for accurate measurement and the LD protection. Moreover, high-speed responding of the control is essential for time-effective inspection. Therefore, we designed an analog circuit that has two feedback loops in this study. One is to keep the PSD's receiving light intensity at a constant level and the second is to keep the maximum output of LD lower than the maximum ratings by feeding back the output of built-in photodiode of the LD.We experimentally showed that the proposed control system keeps the receiving light amount of the PSD at a constant level against a sudden reflectivity change by about 15 times.

本誌: 電気学会論文誌E（センサ・マイクロマシン部門誌） Vol.131 No.11 （2011）

本誌掲載ページ: 381-387 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejsmas/131/11/131_11_381/_article/-char/ja/