Method and means for detecting decay in wood

Details Method and means for detecting decay in wood Method and means for detecting decay in wood

1981-05-29

1983-08-23

Kreitman, Stephen A.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73630, G01N 2900, G01N 2400

Patent

active

043997015

ABSTRACT:
A method and apparatus for detecting degradation in wood by applying acoustic waves along the wood grain and measuring the bandwidths and frequencies or standing wave resonances induced in the wood as the frequency of the applied waves is varied. Good quality wood exhibits a substantially harmonic relationship between the frequencies at which resonances occur and the bandwidths of the resonances are relatively small.

REFERENCES:
patent: 3023609 (1962-03-01), Schubring
patent: 3043132 (1962-07-01), Schubring
patent: 3345861 (1967-10-01), Heath
patent: 3521483 (1970-07-01), Miller et al.
patent: 3531983 (1970-10-01), Heath et al.
patent: 3877294 (1975-04-01), Shaw
patent: 4297872 (1981-11-01), Ikeda et al.
Vibration Analysis of Thin-Walled Cylindrical Shells, by Koval, in MB Vibration Notebook, Jan. 1962, vol. 8, No. 1, .COPYRGT. by Textron Elec. MB.
Sweep Rondom Vibration, by Booth in MB Vibration Notebook, Feb. 1963, vol. 9, No. 1 .COPYRGT. by Textron Elec.

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