Two-channel laser vibrometer techniques for vibrational intensity measurements. Part 1: Flexural intensity
- Pennsylvania State University, State College, PA (United States)
A laser technique which measures vibrational energy flow (intensity) via propagating bending waves is described. A pair of scanning laser beams from a two-channel laser vibrometer is used to provide a nonintrusive measurement of the intensity at various points on a vibrating beam. Results are shown to compare well with those of two additional techniques. These techniques, used for validation, employ a single laser beam and can only be used at resonance frequencies in beams or rods. The two-channel laser technique described can be applied to two-dimensional intensity measurements, is not limited to single frequency excitation, and has an inherent capability to facilitate phase error elimination via a photodetector switching technique which is also described.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 45732
- Journal Information:
- Journal of Vibration and Acoustics, Journal Name: Journal of Vibration and Acoustics Journal Issue: 4 Vol. 115; ISSN 1048-9002; ISSN JVACEK
- Country of Publication:
- United States
- Language:
- English
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