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:
Feb. 04, 1992
Filed:
Nov. 15, 1990
Masahiro Ohno, Kunitachi, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A high-frequency signal is applied from an oscillator via a circulator to a piezoelectric transducer. An ultrasonic wave generated by the piezoelectric transducer is directed to a material through an acoustic lens. The ultrasonic wave transmitted through the material is conducted to a phase-conjugator having a nonlinear piezoelectric element consisting of a crystal of LiNbO.sub.3. A phase-conjugate wave generated by the generating section is transmitted through the material again and received by the piezoelectric transducer. The received signal is supplied to a receiver circuit via the circulator. The receiver circuit gates the received signal in accordance with a time of return of the phase-conjugate wave so as to extract a signal representing the interior of the material. The material is scanned two-dimensionally by a scanning control device so as to display a two-dimensional ultrasonic image on a television monitor.