High speed multipoint vibrometer for modal analysis

S. Earl; T. Wu; J. D. C. Jones; A. J. Moore

doi:10.1117/12.693152

21 June 2006 High-speed multipoint vibrometer for modal analysis

S. Earl, T. Wu, J. D. C. Jones, A. J. Moore

Proceedings Volume 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 634512 (2006) https://doi.org/10.1117/12.693152
Event: Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2006, Ancona, Italy

Abstract

The use of a digital speckle pattern interferometer (SPI) based on a complementary metal-oxide semiconductor (CMOS) camera for vibration measurement is described. The flexibility of the CMOS detector enables regions of interest (ROIs) to be identified with full-field time-averaged measurements, and then to interrogate those regions with time-resolved measurements sampled at up to 70 kHz. The system effectively acts as a non-contact optical vibrometer that can measure surface velocity at several points simultaneously. The CMOS detector allows measurement of the vibration frequency, amplitude and relative phase between ROIs with high spatial and temporal resolution. The multi-point vibrometer was used to collect velocity information of a centre clamped circular plate that is subjected to transient excitation. The information is processed to determine the natural frequency mode shapes from velocity data for the first time.

Citation Download Citation

S. Earl, T. Wu, J. D. C. Jones, and A. J. Moore "High-speed multipoint vibrometer for modal analysis", Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 634512 (21 June 2006); https://doi.org/10.1117/12.693152

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available