Measuring and testing – Vibration – By mechanical waves
Patent
1992-03-25
1994-05-03
Gutierrez, Diego F. F.
Measuring and testing
Vibration
By mechanical waves
G01H 500, G01N 2918, G01N 2920, G01N 2900
Patent
active
053076796
ABSTRACT:
A method of evaluating un-dried lumber for its propensity to degrade, during drying couples an acoustic pulse to un-dried lumber and measures the speed of the propagating of the pulse through the lumber. Preferably, the pulse is directed transversely to the lumber's grain. The pulses may be generated by a calibrated weight striking the lumber's surface and detected at two points on the lumber by means of acoustically coupled accelerometers. A timer, triggering on similar portions of the acoustic pulse as detected at the two points provides the necessary information to deduce speed. A speed threshold is determined empirically by studying samples of the lumber type and the speed of acoustic pulses through them and drying them to determine their propensity to degrade.
REFERENCES:
patent: 3074267 (1963-01-01), Martin
patent: 3190111 (1965-06-01), Trussell et al.
patent: 3327523 (1967-06-01), Kelemencky et al.
patent: 3354699 (1967-11-01), Carnevale et al.
patent: 3384767 (1968-05-01), Arnold et al.
patent: 3513690 (1970-05-01), Pellerin et al.
patent: 3531983 (1970-10-01), Heath et al.
patent: 3600937 (1971-08-01), Nilberg
patent: 3664180 (1972-05-01), McDonald et al.
patent: 3877294 (1975-04-01), Shaw
patent: 3991603 (1976-11-01), Wonn et al.
patent: 4160387 (1979-07-01), Ihara et al.
patent: 4566084 (1986-01-01), Laine
patent: 4750368 (1988-06-01), Shearer et al.
patent: 4838085 (1989-06-01), Pellerin et al.
patent: 4876889 (1989-10-01), Shakkottai et al.
patent: 4941356 (1990-07-01), Pallaske
patent: 4941357 (1990-07-01), Schajer
patent: 5237870 (1993-08-01), Fry et al.
Stress Wave Speed and MOE of Sweetgum Ranging from 150 to 15 percent MC, Forest Products Journal, dated Oct. 1974.
NDE of Green Material With Stress Waves: preliminary results using dimension lumber, Forest Products Journal, dated Aug. 1989.
Identifying Bacterially Infected Oak by Stress Wave Nondestructive Evaluation USDA Forest Service Research Paper FPL-RP-512, dated Mar. 1992.
Fado John D.
Gutierrez Diego F. F.
Silverstein M. Howard
Stockhausen Janet I.
The United States of America as represented by the Secretary of
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