Electronic mine roof bolt tester

Details Electronic mine roof bolt tester Electronic mine roof bolt tester

1979-05-10

1981-08-04

Gilu, James J.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73582, G01N 2904

Patent

active

042815479

ABSTRACT:
The integrity of mine roofs and rock bolts is tested by determining the natural frequencies of the roof and bolt. The roof is struck at a plurality of locations and the resulting vibrations sensed with accelerometers. The output of each accelerometer is separated into a plurality of signals of different frequencies by a comb filter having selected band passes. The amplitude of the outputs of each of the band passes of the filter are used to determine the condition of the roof and bolt adjacent each accelerometer. The high amplitude signal resulting from the initial impact of the striking implement is electrically gated from the accelerometer output.

REFERENCES:
patent: 2635746 (1953-04-01), Gordon
patent: 3531983 (1970-10-01), Heath et al.
patent: 3550434 (1970-12-01), Schroeder et al.
patent: 4062229 (1977-12-01), Godfrey et al.
patent: 4128011 (1978-12-01), Savage et al.

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