25 May 1989 Holographic Fingerprint Sensor
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Proceedings Volume 1051, Practical Holography III; (1989) https://doi.org/10.1117/12.951467
Event: OE/LASE '89, 1989, Los Angeles, CA, United States
Abstract
The fingerprint sensor that we developed uses a hologram. Two requirements are important for actual use; laser safety and high-contrast images. The illumination method we developed uses total reflection and a new type of detection. For safety, total-reflection lighting ensures that laser beams cannot enter an operator's eyes. To obtain high-contrast images, signal and noise light were separated.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shin Eguchi, Shin Eguchi, Seigo Igaki, Seigo Igaki, Fumio Yamagishi, Fumio Yamagishi, Hiroyuki Ikeda, Hiroyuki Ikeda, Takefumi Inagaki, Takefumi Inagaki, } "Holographic Fingerprint Sensor", Proc. SPIE 1051, Practical Holography III, (25 May 1989); doi: 10.1117/12.951467; https://doi.org/10.1117/12.951467
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