Accession Number:

AD0163945

Title:

Instrument for Measuring the Depolarization of Backscattered Light.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s):

Report Date:

1973-03-20

Pagination or Media Count:

7.0

Abstract:

The patent describes an instrument capable of obtainint information on the polarization properties of ocean waters. Operation of the instrument is as follows Light from a He-Ne laser passes through a rotating beam chopper, a rotating linear polarizer, and a light guide and an aperture to block spurious reflections into the scattering medium, generally seawater. A portion of the backscattered light is intercepted by an analyzer-detector module, and after amplification the detector output is displayed on an oscilloscope. The beam is chopped at 20 times the rotational frequency of the polarizer. This provides an a-c backscatter signal which is independent of detector drift and changes in background illumination, if detector ssaturation is avoided.

Subject Categories:

  • Air Conditioning, Heating, Lighting and Ventilating
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE