TEMPORAL REFERENCE ACOUSTICAL HOLOGRAPHY.
Abstract
This paper describes a new form of holography which obviates the need for a reference wave (real or electronically simulated). An experiment is described in which reconstructions were obtained from a temporal reference acoustical hologram recorded at 4.8 MHz with a Sokolov ultrasound camera system. An optical method for recording a large-aperture temporal reference acoustical hologram, uses a double-pulsed ruby laser system. This system introduces a quarter-wavelength shift in the optical reference (or object) beam between the two pulses which are timed half an acoustic cycle apart. The pulsed laser interferometric hologram is thus an optical hologram of an acoustical temporal reference hologram. A second method of optically recording temporal reference acoustical holograms which employs a scanning CW laser is also described. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1969
- Accession Number
- AD0690083
Entities
People
- Alexander F. Metherell
- Edward J. Pisa
- Sidney Spinak