Materials evaluation by optical detection of acoustic emission signals
Abstract
Optical probing methods are used for the analysis of acoustic emission signals, and the results are compared to those of a commercial acoustic emission transducer. Experiments are performed in order to measure real acoustic emission from twinning in indium, tin, zinc, and cadmium, stress corrosion cracking in steel, and thermal shock cracking in glass. It is found that the optical interferometer overcomes difficulties previously associated with optical detectors, and corrects for specimen motions, atmospheric disturbances, and building vibrations. In addition, optical methods permit the recording of actual waveform, including the actual amplitude and frequency spectrum of an acoustic emission event unmodified by ringing or transducer response characteristics.
- Publication:
-
Materials Evaluation
- Pub Date:
- October 1977
- Bibcode:
- 1977MatEv..35..107P
- Keywords:
-
- Acoustic Emission;
- Materials Tests;
- Nondestructive Tests;
- Optical Measurement;
- Piezoelectric Transducers;
- Cadmium;
- Indium;
- Mechanical Twinning;
- Tin;
- Waveforms;
- Zinc;
- Instrumentation and Photography