High-speed digital holographic interferometry for vibration measurement

Journal Article · Sat May 20 04:00:00 EDT 2006 · Applied Optics

DOI:https://doi.org/10.1364/AO.45.0· OSTI ID:20779338

Pedrini, Giancarlo; Osten, Wolfgang; Gusev, Mikhail E

A system based on digital holographic interferometry for the measurement of vibrations is presented. A high-power continuous laser(10 W) and a high-speed CCD camera are used. Hundreds of holograms of an object that has been subjected to dynamic deformation are recorded. The acquisition speed and the time of exposure of the detector are determined by the vibration frequency. Two methods are presented for triggering the camera in order to acquire at a given phase of the vibration. The phase of the wavefront is calculated from the recorded holograms by use of a two-dimensional digital Fourier-transform method. The deformation of the object is obtained from the phase. By combination of the deformations recorded at different times it is possible to reconstruct the vibration of the object.

• OSTI ID: 20779338
• Journal Information: Applied Optics, Journal Name: Applied Optics Journal Issue: 15 Vol. 45; ISSN 0003-6935; ISSN APOPAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAMERAS
CHARGE-COUPLED DEVICES
DEFORMATION
FOURIER TRANSFORMATION
HOLOGRAPHY
INTERFEROMETRY
LASERS
NONDESTRUCTIVE TESTING
TWO-DIMENSIONAL CALCULATIONS