Translator Disclaimer
1 June 1966 Underwater Illumination & Imaging Measurements
Author Affiliations +
Proceedings Volume 0007, Underwater Photo Optics I; (1966)
Event: Underwater Photo-Optical Instrumentation Applications, 1966, Santa Barbara, United States
Modulation transfer function measurements were carried out in relatively clear fresh water using separated narrow-beam transmitter and receiver and diffuse flectance bar and edge targets. The source was a mercury arc lamp. The detector was a multiplier phototube. The results show useful spatial frequency responses up to angular frequencies of 1000 to 2000 cycles per radian at target ranges up to 4 water attenuation lengths. The measured attenuation length for collimated light was 15 feet. With the narrow-beam apparatus, back-scatter was small and was reduced proportionally to the separation between the transmitter and the receiver. The relative backscatter was also reduced as the transmitter beam width was reduced. It was shown that from an examination of the signal response when a target edge was scanned, it was possible to deduce the relative amounts of unscattered and forward scattered light.
© (1966) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Frank S. Replogle Jr. "Underwater Illumination & Imaging Measurements", Proc. SPIE 0007, Underwater Photo Optics I, (1 June 1966);


A Real-Time Optical Mapping System
Proceedings of SPIE (November 10 1978)
Calculation Of LIDAR Beam Spread In Stratified Media
Proceedings of SPIE (September 27 1984)
Analysis Of Medium Resolution In-Water Imaging Systems
Proceedings of SPIE (November 10 1975)
Underwater Detection And Classification System
Proceedings of SPIE (June 01 1966)
Modulated laser line scanner for enhanced underwater imaging
Proceedings of SPIE (October 28 1999)

Back to Top