Accession Number:

AD0741787

Title:

Field Test of a Laser Signalling Device

Descriptive Note:

Corporate Author:

HARRY DIAMOND LABS ADELPHI MD

Report Date:

1972-03-01

Pagination or Media Count:

25.0

Abstract:

The report describes a test, under realistic field conditions, of the feasibility of using a small helium-neon gas laser as a visible signalling beacon. A 1.5-milliwatt laser beam with 2-milliradian beam divergence was clearly visible from the air at a slant range of 30 kilometers, against a bright sunlit background of river, forest, and marshland. The required aiming precision, optimum beam divergence, and narrow-beam secure nature of the laser beacon are discussed. The eye-hazard involved in the use of a laser signaller is shown to be quite small and probably controllable in a field environment. A prototype device that meets the requirement for a compact, light-weight, and self-contained long-range visible beacon is described.

Subject Categories:

  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE