METHOD AND DEVICE FOR MEASURING OSCILLATION

摘要

PROBLEM TO BE SOLVED: To provide a method and a device for measuring a distance to an object, or oscillating displacement by transmitting ultrasonic waves toward the object to be measured and measuring time of arrival of their reflected waves. SOLUTION: In this method for measuring oscillation, the oscillation of a structure in a container is measured from the outside. Received waveforms are orthogonally projected on a vector space spanned by M pieces of different waveforms having shifted times from a fundamental waveform measured beforehand. The M pieces of the time of the arrival are estimated so as to make the similarity between the waveforms determined by orthogonal projection and the received waveforms maximum, and the oscillating displacement is measured from the time of the arrival. This invention includes its device. COPYRIGHT: (C)2005,JPO&NCIPI