Measuring and testing – Moisture content or absorption characteristic of material
Patent
1975-03-07
1977-07-05
Tubbesing, T.H.
Measuring and testing
Moisture content or absorption characteristic of material
340 15, G01N 918
Patent
active
040331792
ABSTRACT:
Methods and apparatus for identifying the source location of acoustic emissions generated within an acoustically conductive medium. A plurality of acoustic receivers are communicably coupled to the surface of the medium at a corresponding number of spaced locations. The differences in the reception time of the respective sensors in response to a given acoustic event are measured among various sensor combinations prescribed by the monitoring mode employed. Acoustic reception response encountered subsequent to the reception by a predetermined number of the prescribed sensor combinations are inhibited from being communicated to the processing circuitry, while the time measurements obtained from the prescribed sensor combinations are translated into a position measurement representative of the location on the surface most proximate the source of the emission. The apparatus is programmable to function in six separate and five distinct operating modes employing either two, three or four sensory locations. In its preferred arrangement the apparatus of this invention will re-initiate a monitoring interval if the predetermined number of sensors do not respond to a particular emission within a given time period.
REFERENCES:
patent: 3545262 (1970-12-01), Steele et al.
patent: 3713127 (1973-01-01), Keledy et al.
Schofield, Utilization of Acoustic Emission for In-Service Inspection, Instn. Mech. Engrs.
Nakamura, Acoustic Emission Monitoring System for Detection of Cracks in a Complex Structure, presented 3-9-70 at Conference of the Amer. Soc. for Nondestruct. Test.
Abeles D. C.
Blum T. M.
Dermer Z. L.
Tubbesing T.H.
Westinghouse Electric Corporation
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