Method and apparatus for fully digital beam formation in a phase

Details Method and apparatus for fully digital beam formation in a phase Method and apparatus for fully digital beam formation in a phase

1986-12-19

1989-02-28

Smith, Jerry

Boots, shoes, and leggings

12866001, G01N 2900

Patent

active

048091847

ABSTRACT:
A method for steering a beam of vibratory energy to a desired angle .theta. with respect to the plane of an array of transducers, uses apparatus which generates a plurality of sampling strobe sequences with each strobe pulse occurring at a time interval T after the preceding strobe pulse, where T satisfies the Nyquist condition. A different one S.sub.j of the strobe signals is assigned to each different transducer channel and the commencement time of the strobe signal in each channel is offset by a time interval which is a first positive integer multiple M.sub.j, selected for each angle .theta., of an offset time interval which is not greater than 1/32nd of the reciprocal of the ultrasonic excitation frequency F.sub.u. Each strobe signal triggers conversion of the present amplitude of the return signal directly to a digital data word; the apparatus then digitally delays each data word in each of the N channels for a delay time interval selected to cause the delayed data words from all N channels, when coherently summed, to represent any change in reflectance in the beam at the desired angle .theta..

REFERENCES:
patent: 4155260 (1979-05-01), Engeler et al.
patent: 4373395 (1983-02-01), Borburgh et al.
patent: 4516583 (1985-05-01), Richard
patent: 4567897 (1986-02-01), Endo et al.
patent: 4604697 (1986-08-01), Luthra et al.
patent: 4622634 (1986-11-01), Fidel

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