VIBRATION MEASURING SYSTEM, VIBRATION MEASURING METHOD, AND COMPUTER PROGRAM
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United States of America Patent
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Issued Date -
Oct 22, 2009
app pub date -
Oct 26, 2006
filing date -
Oct 27, 2005
priority date (Note) -
Abandoned
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Abstract
There is provided a non-contact vibration measurement technique for a structure by continuously imaging the structure from a far distance using a PIV system and measuring vibration through image analysis. A vibration measurement method includes an imaging step for imaging an object separated by a long distance at a minute time interval by including a long focus optical system, an image processing step for comparing luminance pattern distributions at plural time instants obtained by the imaging step so as to measure a moving direction and a moving amount of a predetermined particle image in the object, a measuring result input step for inputting numerous measurement results of the moving direction and the moving amount of the predetermined particle image measured by the image processing step, a vibration frequency calculation step for calculating an acceleration vector from the imaging interval and performing Fourier transform thereon so as to calculate the vibration frequency of the object, and a vibration frequency output step for outputting the calculation result obtained by the vibration frequency calculation step.
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