X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1990-11-28
1992-04-14
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Absorption
378210, G01B 1506
Patent
active
051054531
ABSTRACT:
A manually operable device for detecting wood pole decay and a method of using the same are disclosed. A gamma ray emitter is provided with guide means enabling it to be piloted longitudinally along the wooden pole so that gamma rays from the emitter pass diametrically through the wooden pole along a longitudinal axis of the pole. The attenuation of the gamma rays are continuously recorded along the longitudinal axis, and a permanent record of the variation in gamma ray attenuation is made, from which it can be determined whether the pole is healthy or decayed, and if decayed, the location of the decay along the pole. In order to facilitate locating decay in the pole, the guide means includes an odometer programmed to provide an electrical pulse every 15 cm which is recorded with the data of gamma ray attenuation. Once data on gamma ray attenation has been recorded along one longitudinal axis of the pole, the device may be used on a longitudinal axis at 90.degree. to the first axis, in order to pinpoint the latitude and extent of decay points in the wooden pole.
REFERENCES:
patent: 3136892 (1964-06-01), Willett
patent: 3460152 (1969-08-01), Proctor
patent: 3594579 (1971-07-01), Garrett
patent: 3864627 (1975-02-01), Shigo
patent: 3877294 (1975-04-01), Shaw
patent: 3946234 (1976-03-01), Hounsfield
patent: 4283629 (1981-08-01), Habermehl
patent: 4399701 (1983-08-01), Dunlop
"Nondestructive Evaluation of Wood Utility Poles-vol. 1: Current Status"-Mar. 1987.
"CAT Scanner Inspects Poles in Field"-Transmission & Digest Magazine-Aug. 1989.
Alfermann Herman
Hanrahan Robert C.
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