Scanning laser Doppler techniques for vibration testing
Abstract
The feasibility of using a scanning LDV to measure the mode shape of a vibrating structure is shown. The technique of simultaneously gathering vibration velocity information from multiple locations along the scan is demonstrated. This makes it possible to obtain the velocity simultaneously from multiple points while using only a single sensor system. A novel data processing technique extracts Chebyshev approximations to the velocity profile. The scanning LDV provides a measuring tool that is noncontacting and adds no mass to the structure. The mode shape data from measurements using the scanning LDV exhibit good agreement with theoretical predictions.
- Publication:
-
1991 SEM Spring Conference on Experimental Mechanics
- Pub Date:
- 1991
- Bibcode:
- 1991sem..conf..854S
- Keywords:
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- Laser Doppler Velocimeters;
- Optical Scanners;
- Vibration Meters;
- Vibration Mode;
- Vibration Tests;
- Chebyshev Approximation;
- Data Reduction;
- Instrumentation and Photography