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

1980-12-17

1982-09-21

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

73632, G01N 2904

Patent

active

043500447

ABSTRACT:
For testing wooden poles, a transmitter unit including a piezo electric transducer, energized to produce repetitive pulses of ultrasonic frequency, is held against the pole. The transmitter unit produces an audible sound synchronously with each ultrasonic pulse. A portable receiver unit having a probe coupled to a piezo electric transducer is held against the pole. This receiver unit includes a signal level comparator which causes a lamp to flash on for each received ultrasonic pulse above a predetermined amplitude. The receiver is held in a plurality of positions and readings are noted where the lamp flashes synchronously with the audible signal. From these readings the strength remaining in the pole to resist bending forces is calculated.

REFERENCES:
patent: 3066525 (1962-12-01), Harris
patent: 3190111 (1965-06-01), Trussell et al.
patent: 3345861 (1967-10-01), Heath
patent: 3521483 (1970-07-01), Miller et al.
patent: 3531983 (1970-10-01), Heath et al.
patent: 3600937 (1971-08-01), Nilberg
patent: 3877294 (1975-04-01), Shaw
patent: 4059988 (1977-11-01), Shaw
patent: 4074564 (1978-02-01), Anderson

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