Measuring and testing – Vibration – By mechanical waves
Patent
1992-09-17
1994-02-15
Lobo, Ian J.
Measuring and testing
Vibration
By mechanical waves
G01H 100
Patent
active
052856887
ABSTRACT:
A system for detecting wood-destroying insects by sensing acoustic emissions generated by the insects as they feed. The system comprises two acoustic emission sensors, an amplification section, a signal processing section and an indicator section. The system comes into mechanical contact with the wood to be inspected through the use of a bolt which is inserted into the wood and attaches to an acoustic emission sensor or through the use of an adhesive layer which directly attaches an acoustic emission sensor to the wood. The acoustic emission sensors are electrically connected to the amplification section which is electrically connected to the signal processing section. The signal processing section is capable of distinguishing between insect-caused acoustic emissions and noise-caused acoustic emissions detected by the acoustic emission sensors. The results of the signal processing section are sent to the indicator section.
REFERENCES:
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patent: 4895025 (1990-01-01), Betts
Noguchi et al., "AE Monitoring to detect Termite Attack on Wood of Commercial . . . " Forest Products Journal, vol. 41, #9, Sep. 1991.
The International Research Group on Wood Preservation, "Using AE Monitoring for Detecting Economically Important Species of Termites in California", by Vernard R. Lewis et al., May 20-24, 1991.
In Press USDA Pacific Southwest Forest & Range Exper. Stat. Publication, "The Potential of Using Acoustical Emission to Detect Termites Within Wood", by Vernard R. Lewis et al.
"Characteristics of Acoustic Emission Signals Generated by Termite Activity in Wood", by William P. Robbins et al.
"An Acoustic-Emission-Based Termite Detection System", by William P. Robbins et al.
The International Research Group on Wood Preservation, "Feasibility of AE (Acoustic Emission) Monitoring for the Dectection of the Activities of Wood Destroying Insects", by Yoshihisa Fujii et al., May 10-15, 1992.
"Acoustic Emission Testing to Detect Termites in Structural Timbers", by Thomas John Schaal, pp. 1-58, Mar. 1991.
Product Innovation by Vernard Lewis "Acoustic Emission Device for Termite Detection", p. 26.
"Using Acoustic Emission Monitoring to Detect Termite Activity in Wood", Yoshihisa Fujii et al., (Jan. 1990).
The International Research Group on Wood Preservation, "Detection of Termite Attack in Wood Using Acoustic Emissions", pp. 1-7.
"Anecdotal History of Acoustic Emission From Wood", by Thomas F. Drouillard (Jul. 16, 1990), pp. 1-22.
"The Potential of Using Acoustical Emission to Detect Termites Within Wood", pp. 1-11.
Mueller Rolf K.
Robbins William P.
Lobo Ian J.
Regents of the University of Minnesota
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