1 December 1991 Holographic disk scanner for active infrared sensors
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Abstract
A holographic disk scanner for a laser vision sensor that can locate objects under hazardous conditions has been developed. The laser vision system utilizes a CO2 laser with a wavelength of 10.6 micrometers , and has excellent transmission characteristics through an environment of smoke and flames. In designing the holographic disk scanner, the diffraction efficiencies were calculated for substrate materials and grating profiles while considering the relationship between the grating period and the groove depth. Based on the calculations, surface-relief transmission gratings were fabricated using germanium (Ge) as a substrate, thereby obtaining a maximum diffraction efficiency of 62.9%. Using the gratings, a ten-facet holographic disk scanner was constructed. By rotating the scanner at 6000 rpm, high-speed image construction of 7 frames/sec, a resolution of 10 cm, and a field of vision of +/- 4 degree(s) were accomplished.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yoshikazu Kawauchi, Yoshikazu Kawauchi, Ryuuichi Toyoda, Ryuuichi Toyoda, Minoru Kimura, Minoru Kimura, Koichi Kawata, Koichi Kawata, } "Holographic disk scanner for active infrared sensors", Proc. SPIE 1555, Computer and Optically Generated Holographic Optics; 4th in a Series, (1 December 1991); doi: 10.1117/12.50637; https://doi.org/10.1117/12.50637
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