7. Glossary

Vibrométrie laser Doppler; laser Doppler velocimetry or laser Doppler anemometry

A technique for measuring the vibratory velocity of a surface by measuring the Doppler shift in the frequency spectrum of the optical wave backscattered by the surface. The technique usually uses a Mach-Zehnder interferometer and an acousto-optical Bragg cell.

Time-integration holography; time-average holography

This method involves recording the hologram with an exposure time that is very long in relation to the object's vibration period.

Stroboscopic holography; stroboscopic holography

This technique consists in illuminating the object synchronously with the vibration, so that the hologram only sees the same vibratory state of the object at all times. Laser pulses are required, either...