LASER VELOCIMETRY.
Abstract
Laser velocimetry is the measurement of transverse velocity by detection of motion in reflected laser radiation. Reflections from a diffuse surface form a diffraction field which moves in space as the surface moves. A photomultiplier and optical grating detect the diffraction field motion as a frequency spectrum. The center frequency of the detector output is equal to the velocity of the diffraction field divided by two times the width of one grating line. The diffraction field velocity is a linear function of reflecting surface velocity and detector range and a non-linear function of incident laser radiation wavefronts. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1964
- Accession Number
- AD0608087
Entities
People
- Philip C. Staas Jr.
Organizations
- Air Force Institute of Technology