THE MEANINGFUL USE OF THE SECCHI DISC.

Abstract

The Secchi Disc is examined in terms of a target seen by the human eye under threshold contrast conditions. Results indicate that the Secchi Disc Reading is related to both the extinction coefficient and the beam transmittance coefficient. There appears to be no way to separate the two from the use of the Secchi Disc alone. In addition, if these readings are to have any meaning at all it is strongly indicated that an optical filter be placed in the system when readings are taken. Special colored glasses are suggested for this purpose. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1968
Accession Number
AD0679166

Entities

People

  • Jerome Williams

Organizations

  • Johns Hopkins University

Tags

DTIC Thesaurus Topics

  • Coefficients
  • Contrast
  • Extinction
  • Filters
  • Optical Filters
  • Transmittance

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Spectroscopy.
  • Systems Analysis and Design