United States Department of Transportation
i
Optical Communications and Detection Systems
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1971-08-01
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[PDF-3.15 MB]
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Abstract:The two milestones of the program (1) development of a high quantum efficiency 1.06 micron photomissive surface and (2) narrow pulse propatation in the earth's atmosphere at 0.63 microns were completed.
Item 1 was completed in a contract award.
Item 2 was completed to the extent permitted by the weather conditions in that only two foggy days were encountered during the three month period. The clear air measurements indicated that: pulse broadening in the atmosphere is less than 20 picoseconds or a coherence bandwidth in excess of 50 GHz; aperture averaging appears to progress with the square of the collector diameter for large diameters; statistics of aperture averaged signal remain log normal.
The measurements from one foggy day indicate: no pulse broadening was observed in fogs with 1/4 mile visibility although a 20dB loss was encountered; no return from multiple scattering could be observed to a 4 degree field of view with a 20dB dynamic range in the detector; no Doppler broadening greater than 1 KHz was observed with optical thickness as high as 4.
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