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:
Jun. 30, 1992
Filed:
Oct. 15, 1990
Keishi Negita, Kanagawa, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A method for measuring a propagation speed of ultrasonic wave transmission through a medium of known dimension, comprises a step of generating a plurality of pulse trains at each cycle of a predetermined time interval t.sub.i, each of the RF pulse trains being composed of at least two consecutive RF pulses generated at a predetermined time period t.sub.s for exciting an output ultrasonic wave. The measuring method also includes the step of inputting a signal indicative of a superposed ultrasonic echo occurring due to the output ultrasonic wave applied to the medium, on a Y-axis of an oscilloscope, and inputting continuous X-axis trigger pulses having a predetermined period t.sub.o on an X-axis of the oscilloscope. The speed of the ultrasonic wave is derived on the basis of a length of the medium and the period t.sub.s read through the oscilloscope when an amplitude of the echo signal becomes greatest and the echo signals are overlapped in phase, by adjusting a value of the period t.sub.o while keeping the period relationship of t.sub.o =t.sub.s =t.sub.i /m, wherein m is an integer which exceeds the number of the RF pulses of the RF pulse train.