Acoustic Emission Transducers: Calibration Activities and Transducer Development.
Abstract
Based on recommendations by ASTM, ASME, and the AE Working Group, a facility for the calibration of AE sensors was developed. This development was partially supported by the Electric Power Research Institute and the Office of Naval Research. The calibration subjects the device under test to a known dynamic displacement in order to determine its sensitivity as a function of frequency. The first method implemented makes use of the surface-pulse configuration in which the mechanical input (a capillary-glass-break source which produces point-force step function) and the device under test are located on the same surface of a large transfer block which approximates a half-space. More recently, a through-pulse method has also been implemented; in this configuration the mechanical input and the device under test are centered on the transfer block on opposite surfaces. Transducers which measure dynamic surface displacement with high sensitivity and fidelity are being developed, modeled and evaluated by means of the calibration facility. Such transducers are needed as transfer standards for the secondary calibration of acoustic emission sensors, as a tool in developing signal processing techniques to characterize acoustic emission sources, and as transducers for field applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 30, 1985
- Accession Number
- ADA158906
Entities
People
- D. G. Eitzen
- F. R. Breckenridge
- M. Greenspan
- T. M. Proctor
Organizations
- National Institute of Standards and Technology