| 摘要 |
1,208,057. Holography. HOLOTRON CORP. Aug. 20, 1968, [Aug. 23, 1967], No. 39678/68. Heading G23. [Also in Divisions G1, H4 and H5] A method of producing holographic information comprises producing and receiving an object signal by scanning a point source 30 of coherent wave radiation over a plane 29, Fig. 2, each point on the source plane effectively illuminating the entire object scene and receiving the object signal at a fixed point 27 in space, and mixing the object signal with a reference signal coherent therewith to produce the holographic information. Both the object signal and reference signal may be received directly at position 27 and the hologram recorded there, or the object signal from position 27 may be electronically mixed with a reference signal 33, Fig.2A to give a holographic interference beam 35. The radiation used may be visible light, ultraviolet light, infrared radiation, radiofrequency radiation, modulated electro-magnetic radiation, x-ray radiation, microwave, seismic, ultrasonic, hypersonic radiation or phonons. Specific applications mentioned are the use of an ultrasonic hologram of a human stomach to determise the existence of any disorders and in non- destructive flaw detecting in objects e.g. ceramics, using infrared with a refrigerated infrared detector.
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