The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 1983
Filed:
Mar. 24, 1982
William E Peterson, Thousand Oaks, CA (US);
Rockwell International Corporation, El Segundo, CA (US);
Abstract
An apparatus for generating acoustic waves of wavelength .lambda. in an electrically conductive object includes an electromagnetic acoustic transducer, with a source of magnetic flux for producing a magnetic field in the object, a first periodic coil within the field, and a second periodic coil within the field and offset from the first coil by .lambda./4. A first port of a four port hybrid is connected to the first coil and a second port is connected to the second coil, with a 90.degree. phase delay element interposed between the first port and the first coil. A signal generator provides an input signal at a frequency corresponding to .lambda., with a transmitter for applying the signal to either a third or a fourth port of the hybrid to generate a unidirectional wave in one of two opposite directions. An apparatus for detecting acoustic waves includes a first receiver connected to the third port and a second receiver connected to the fourth port.