A novel safety light curtain system using a hemispherical mirror

Yusuke Kenjo; Ryosuke Suzue; Huimin Lu; Kohei Miyata; Shiyuan Yang; Seiichi Serikawa

doi:10.1117/12.999722

30 November 2012 A novel safety light curtain system using a hemispherical mirror

Yusuke Kenjo, Ryosuke Suzue, Huimin Lu, Kohei Miyata, Shiyuan Yang, Seiichi Serikawa

Proceedings Volume 8561, Advanced Sensor Systems and Applications V; 856119 (2012) https://doi.org/10.1117/12.999722
Event: Photonics Asia, 2012, Beijing, China

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.

Citation Download Citation

Yusuke Kenjo, Ryosuke Suzue, Huimin Lu, Kohei Miyata, Shiyuan Yang, and Seiichi Serikawa "A novel safety light curtain system using a hemispherical mirror", Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 856119 (30 November 2012); https://doi.org/10.1117/12.999722

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available