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:
Sep. 21, 1999
Filed:
Jul. 18, 1997
Noritaka Egami, Kobe, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus and a method for acoustic wave measurement according to the present invention are characterized by oscillating a magnetostrictive vibrator with a frequency to emit an acoustic wave to an object to be measured, calculating the amplitude of a signal received by a wave receiver, and repeating the previous steps throughout a range of different frequencies to detect the resonance frequency. The amplitude of the received signal is calculated from values of the signal sampled at an interval of 1/4 of one cycle of the emitted frequency. This reduces the time of the measurement of a thickness a presence of flaws, a presence of impurities and minimizes noises during the measurement.