Accession Number:

AD0625929

Title:

AN ACTIVE OPTICAL DEMONSTRATION DEVICE EXHIBITING RANGE CUTOFF,

Descriptive Note:

Corporate Author:

HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s):

• North,Gordon D.

Report Date:

1965-10-25

Pagination or Media Count:

16.0

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

Descriptors:

• GALLIUM ALLOYS
• ARSENIC ALLOYS
• INFRARED TRANSMITTERS
• INFRARED RECEIVERS
• SEMICONDUCTOR DIODES
• TRANSISTORS
• OPTICS

Subject Categories:

• Infrared Detection and Detectors
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE