Accession Number : AD0674762

Title :   THE RELATIVE IMPORTANCE OF PHASE AND AMPLITUDE IN ACOUSTICAL HOLOGRAPHY.

Descriptive Note : Research Communication no. 63,

Corporate Author : DOUGLAS AIRCRAFT CO INC HUNTINGTON BEACH CALIF ADVANCED RESEARCH LABS

Personal Author(s) : Metherell,A. F.

Report Date : MAY 1968

Pagination or Media Count : 44

Abstract : The paper contains a description of experiments in which conventional holograms are compared with 'phase only' holograms, in which the object wave amplitude was normalized to a constant quantity. These experiments revealed that there is no significant difference between the quality of the reconstructed images from the two types of holograms. To explain these results, mathematical consideration is given to the question of the relative importance of phase alone versus phase plus amplitude. It is shown that the amplitude term in the hologram plane acts only on the overall amplitude of the object points and not on their relative amplitudes. The same result is seen from a qualitative physical argument. (Author)

Descriptors :   (*ACOUSTIC SIGNALS, *IMAGES), STEREOPHOTOGRAPHY, LASERS, ACOUSTICS, PHASE, MATHEMATICAL ANALYSIS, RESOLUTION, SYMPOSIA

Subject Categories : Lasers and Masers
      Holography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE