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Proceedings Paper

A novel safety light curtain system using a hemispherical mirror
Author(s): Yusuke Kenjo; Ryosuke Suzue; Huimin Lu; Kohei Miyata; Shiyuan Yang; Seiichi Serikawa
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Paper Abstract

Light curtain systems are used to detect intruders in various cases and places. However, it is necessary to adjust the position of the light detecting element accurately in order to receive the irradiating laser light. We propose a new type safety light curtain system that uses a hemispherical mirror and an LED in this research. A hemispherical mirror can reflect irradiating light rays surroundings of 180° in the vertical direction and 360° in the horizontal direction. When an LED is at a position that is higher than the hemispherical mirror, the LED irradiating light can be reflected by the hemispherical mirror, even if the LED is arbitrarily set up. In the case that, the light of LED is intercepted when an intruder passes between the LED and the hemispherical mirror, the output voltage of the light detecting element decreases. We can set a proper threshold voltage value of the detecting element to judge whether an intruder passes or not. Our system uses a PSOC microcomputer to judge the output voltage of the receiving element with the threshold voltage value. In addition, the LED output light is modulated by 10kHz in order to avoid the influence of the surrounding turbulence light. Our experiment succeeded to detect intruder using the proposed system without accurate light axis setting.

Paper Details

Date Published: 30 November 2012
PDF: 8 pages
Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 856119 (30 November 2012); doi: 10.1117/12.999722
Show Author Affiliations
Yusuke Kenjo, Kyushu Institute of Technology (Japan)
Ryosuke Suzue, Kyushu Institute of Technology (Japan)
Huimin Lu, Kyushu Institute of Technology (Japan)
Kohei Miyata, Kyushu Institute of Technology (Japan)
Shiyuan Yang, Kyushu Institute of Technology (Japan)
Seiichi Serikawa, Kyushu Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 8561:
Advanced Sensor Systems and Applications V
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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