Holographic disk scanner for active infrared sensors

Yoshikazu Kawauchi; Ryuuichi Toyoda; Minoru Kimura; Koichi Kawata

doi:10.1117/12.50637

1 December 1991 Holographic disk scanner for active infrared sensors

Yoshikazu Kawauchi, Ryuuichi Toyoda, Minoru Kimura, Koichi Kawata

Proceedings Volume 1555, Computer and Optically Generated Holographic Optics; 4th in a Series; (1991) https://doi.org/10.1117/12.50637
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

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Yoshikazu Kawauchi, Ryuuichi Toyoda, Minoru Kimura, and 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); https://doi.org/10.1117/12.50637

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KEYWORDS

Diffraction gratings

Diffraction

Holography

Scanners

Germanium

Infrared sensors

Sensors

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