Accession Number:

ADA029067

Title:

Surface Information from Far-Field Speckle Analysis.

Descriptive Note:

Technical rept.,

Corporate Author:

ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL ALA PHYSICAL SCIENCES DIRECTORATE

Personal Author(s):

Report Date:

1976-04-01

Pagination or Media Count:

22.0

Abstract:

Formulas for measurement and analysis of far-field speckle from a coherently illuminated flat nonsmooth surface are presented. This report is tailored to the constraints of monostatic laser signature measurements using Fourier transforms. The goal of such analysis is to determine target surface detail, especially roughness parameters. A function has been derived which indicates the resolution with which surface detail can be deduced. A general equation from which an autocorrelation length can be obtained is derived, and four special cases are considered. In some cases, this length is a phase coherence length, in others it is an amplitude correlation length. In two cases, information about object size can be obtained.

Subject Categories:

  • Optical Detection and Detectors
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE