Method of and apparatus for testing wooden poles

Details Method of and apparatus for testing wooden poles Method of and apparatus for testing wooden poles

2011-07-05

2011-07-05

Williams, Hezron (Department: 2856)

Measuring and testing

Vibration

By mechanical waves

C073S648000, C702S039000

Reexamination Certificate

active

07971485

ABSTRACT:
A method of testing an elongate wooden element includes injecting an input acoustic signal into the element, detecting a return acoustic signal at a surface of the element, and determining a spectral profile for the return signal. In at least a predetermined range in the spectral profile, each resonance peak is detected whose amplitude exceeds a first predetermined value, and from the resonance peaks so detected the number of higher peaks is determined whose amplitude exceeds 3 dB. For each of said higher peaks a quality factor Q is calculated, a mean quality value Qmis determined, and Qmis then compared with a predetermined value to provide an indication of the presence or absence of external decay of the element. A ratio R of the number of higher peaks to the number of resonance peaks detected, and the statistical spread S of the average Q for the spectral profile, are calculated and compared with a predetermined boundary function Fn(R,S) to determine acceptability or unacceptability of the pole.

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patent: WO 02/08749 (2002-01-01), None

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