Abstract
Piezoelectric transducers are commonly used to monitor acoustic emission events. However, the information they yield is modified by the response characteristics of the transducers themselves, as well as by those of the medium which acoustically couples the transducer to the workpiece. Optical probing methods offer many advantages over piezoelectric transducers for monitoring acoustic emission events. Among these advantages are: (1) optical probes require no contact with the specimen and, obviously, no couplant; (2) they do not disturb the acoustic waves being detected; (3) they have broad frequency response limited only by the electronic amplifier and they are free from mechanical resonances; (4) because they can be absolutely calibrated, they measure actual acoustic displacements; and (5) they can measure the instantaneous local displacements within a few hundredths of a millimeter of a crack or other emission source. It is the purpose of the present chapter to present a comparative evaluation of optical methods for probing acoustic emission signals and to describe an acoustic emission interferometer which is superior in many respects to the other methods.
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© 1979 Plenum Press, New York
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Palmer, C.H., Green, R.E. (1979). Optical Probing of Acoustic Emission Waves. In: Burke, J.J., Weiss, V. (eds) Nondestructive Evaluation of Materials. Sagamore Army Materials Research Conference Proceedings, vol 23. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2952-7_15
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DOI: https://doi.org/10.1007/978-1-4613-2952-7_15
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