Surface Information from Far-Field Speckle Analysis.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1976
- Accession Number
- ADA029067
Entities
People
- J. Lynn Smith