SMALL DEFORMATION MEASUREMENTS OF DIFFUSE OBJECTS - PHASE-STEPPING BYFREQUENCY DRIFT OF A HE-NE-LASER

Authors
HELG TL BARNES TH HASKELL TG
Citation
Tl. Helg et al., SMALL DEFORMATION MEASUREMENTS OF DIFFUSE OBJECTS - PHASE-STEPPING BYFREQUENCY DRIFT OF A HE-NE-LASER, Optical review, 4(2), 1997, pp. 288-292
Citations number
3
Categorie Soggetti
Optics
Journal title
Optical review → ACNP
ISSN journal
13406000
Volume
4
Issue
2
Year of publication
1997
Pages
288 - 292
Database
ISI
SICI code
1340-6000(1997)4:2<288:SDMODO>2.0.ZU;2-7
Abstract
We describe a simple phase-stepping speckle interferometer with large path difference, in which phase modulation is achieved by thermal freq uency drift of the He-Ne light source. This system is easy to set up, requires no specialised components, is immune from the effects of piez o actuator hysteresis, and is capable of producing phase maps in which the noise is less than 1/20 lambda.