Accession Number:

ADA048362

Title:

Laser Autoreflectance.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

• Martin,Charles W.

Report Date:

1977-12-01

Pagination or Media Count:

109.0

Abstract:

The autoreflectance peak in the angular reflectance distribution of laser radiation from nonspecular surfaces is investigated. An experimental apparatus using a He-Ne laser operating at 632.8 nm is described. This apparatus allowed measurement of the reflectance from a surface from 0 to 90 deg from the autoreflectance direction in the plane of incidence. The reflectance measurements from surfaces of smoked MgO, a MgCO3 block, a nonspecular gray paint, a pigmented, polymeric bead paint, and 3M Company Black Velvet paint are presented. Each of the five surfaces are shown to exhibit an autoreflectance peak and the dependence of the peak magnitude on measurement distance and the incidence angle is measured. A theoretical reflectance equation for coherent, collimated radiation indicent on a surface of spherical particles is developed, and the results of this equation are shown to compare to the measured reflectance data within a few percent. Author

Descriptors:

• *LASER BEAMS
• *COHERENT OPTICAL RADIATION
• *REFLECTANCE
• SURFACE ROUGHNESS
• THESES
• ELECTRON MICROSCOPY
• OXIDES
• PAINTS
• MAGNESIUM COMPOUNDS
• REFLECTIVITY
• HELIUM NEON LASERS
• SPECTRUM ANALYSIS
• CARBONATES

Subject Categories:

• Lasers and Masers
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE