AN ACTIVE OPTICAL DEMONSTRATION DEVICE EXHIBITING RANGE CUTOFF,

Abstract

A simple active optical device was designed and built to demonstrate the principles of a geometric ranging optical system. The optical system consists of an objective lens and a beam splitter to provide coincidence of the source and detector beams. The depth of the region in which an object can be detected is proportional to the ratio of the height of the source image to the diameter of the lens. The maximum range of the system is proportional to the lens diameter and to the fourth root of the source radiance. The device described has a range of about 4 ft with a 2-in. F 3.5 lens, a GaAs light emitting diode as the source, and a PbS cell detector. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 25, 1965
Accession Number
AD0625929

Entities

People

  • Gordon D. North

Organizations

  • Harry Diamond Laboratories

Tags

DTIC Thesaurus Topics

  • Demonstrations
  • Detectors
  • Diameters
  • Diodes
  • Light Emitting Diodes
  • Radiance
  • Warning Systems

Fields of Study

  • Physics

Readers

  • Coastal Oceanography
  • Electrical Engineering
  • Radar Systems Engineering.