Accession Number : ADD000168

Title :   Passive Holography System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Sternberg,Ronald Frederick ; Koppelmann,Roger Fred

Report Date : 29 Jan 1974

Pagination or Media Count : 6

Abstract : The patent deals with a passive holography system for imaging remotely generated coherent acoustical signal source thru the techniques of phase locking a locally controlled, voltage controlled oscillator to the signal and at the same time displaying those signals so that an acoustical spectrum can be sampled and recorded until a desired signal is identified. Then a second phase-locked-loop circuit is controlled to automatically track the received incoming signal and generate a reference signal which is coherent with the received signal and which is used by the holographic system to image the source of the received signal.

Descriptors :   *Holography, *Patents, Passive systems, Acoustics, Images, Coherent radiation, Phase shift circuits

Subject Categories : Holography

Distribution Statement : APPROVED FOR PUBLIC RELEASE