Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Camera influence on the phase-measurement accuracy of a phase-shifting speckle interferometer

Not Accessible

Your library or personal account may give you access

Abstract

In a real phase-shifting interferometer the camera (i.e., a photodetector plus an analog-to-digital converter) cuts off intensities above some saturation level and provides a limited number of digitization steps. Owing to the intensity statistics of speckle fields, this might severely influence the accuracy of the calculated speckle phase. The optimum beam ratio and the modulation of the camera are computed. To calculate the standard deviation of the phase difference, first, we derive a relation that shows that the variances of the two measured phase frames are equal and that they must be added with the decorrelation-dependent variance. To obtain the minimum phase-measurement error of 25.1 mrad, it is found that the mean speckle intensity ought to be adjusted to be 0.058 times the saturation intensity of the camera and that the beam ratio is to be 5.7. The results are confirmed by computer simulation of a two-wavelength speckle interferometer.

© 1996 Optical Society of America

Full Article  |  PDF Article
More Like This
Optimum lens aperture in phase-shifting speckle interferometric setups for maximum accuracy of phase measurement

Thomas Maack, Richard Kowarschik, and Gunther Notni
Appl. Opt. 36(25) 6217-6224 (1997)

Decorrelation-induced phase errors in phase-shifting speckle interferometry

Mathias Lehmann
Appl. Opt. 36(16) 3657-3667 (1997)

Phase-shifting speckle interferometry

Katherine Creath
Appl. Opt. 24(18) 3053-3058 (1985)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (64)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved