| 摘要 |
An improved and simplified energy propagation and detection system for forming a hologram of an object illuminated with coherent acoustic or radio energy. Coherent wave energy incident on and modified by the object is received and detected at a hologram plane. Photographic film used in conventional optical holography to record interference patterns at the hologram plane is not useful with acoustic or radio energy, and other types of sensors or receivers must therefore be used. In the past, a two-dimensionally scanned receiver or a grid of many fixed receivers has been used at the hologram plane to map energy intensity and phase, and to provide signals from which an optical hologram is constructed. The new system uses a single linear array of receivers in combination with either a single energy source which is mechanically scanned in one dimension, or a linear array of sources oriented transversely to the array of receivers. A major reduction in the total number of sources and receivers is achieved to permit economical mapping of a large hologram plane with resolution adequate for underwater object detection and similar applications.
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