Process for the acoustic examination of monoliths for damage and device for implementing the process
Patent 5285687 Issued on February 15, 1994. Estimated Expiration Date: 
October 7, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 7, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2388246 3097523 Apparatus and method for the non-destructive testing of the physical integrity of a structural part Method and apparatus for testing timbers for disconformity or decay Defect detecting method and apparatus Patent #: 5144838 InventorsAssigneeApplicationNo. 761359 filed on 10/07/1991US Classes:73/579, Resonance, frequency, or amplitude study73/12.01, TESTING BY IMPACT OR SHOCK73/12.14PivotedExaminersPrimary: Chapman, Jeanette E.Attorney, Agent or FirmForeign Patent References
International ClassG01H 003/08Foreign Application Priority Data1989-12-28 DEAbstractA method and apparatus for the acoustic examination of a monolith for damage, wherein a blow of defined force is applied by a hard striker to a monolith for its acoustic examination for damage. The sound pressure distribution over a predetermined frequency range, of the sound radiated by the struck monolith is analyzed by a frequency analyzer and the result is compared with a reference curve defined for undamaged monoliths. The device for implementing the process has a receptacle for the monolith to be examined, a striker, capacitor microphones as the sound pressure receivers and an evaluation unit with a frequency analyzer. | |
