Sonic Vibration Technique for Rot Detection in Wood Poles

A new method is proposed for rot detection in wood poles such as those used for electricity distribution purposes. The test method has been developed to meet the problem of detection of concealed ground-line rot in full length preservative treated poles and appears to be capable of successfully achieving this end. A resonant sonic vibration technique is employed which is capable of detecting seriously defective poles not at present accessible to inspection. The technique is essentially nondestructive in nature, and provides a degree of precision and security not formerly available. A device employing the technique is described, which is suitable for use by workers of the caliber of those now employed in the detection of defective power poles.