Abstract

A new rotary encoder is proposed which detects displacement of speckle arising in the diffraction field of a cylinder illuminated by a narrow laser beam. The displacement is detected from the peak position of the cross-correlation between the outputs of a linear image sensor. The speckle displacement due to small rotation of the cylinder is derived first. In experiments correlation is computed on a microcomputer for investigating the sensitivity and repeatability. A He–Ne laser and a laser diode are used for metal and paper surfaces. Acceleration and extension of the measurement range has also been possible by developing a real-time correlator.

© 1989 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Laser-speckle angular-displacement sensor: theoretical and experimental study

Bjarke Rose, Husain Imam, Steen G. Hanson, Harold T. Yura, and René S. Hansen
Appl. Opt. 37(11) 2119-2129 (1998)

Speckle dynamics from in-plane rotating diffuse objects in complex ABCD optical systems

H. T. Yura, B. Rose, and S. G. Hanson
J. Opt. Soc. Am. A 15(5) 1167-1173 (1998)

High-resolution laser speckle correlation for displacement and strain measurement

Reinhard Feiel and Philip Wilksch
Appl. Opt. 39(1) 54-60 (2000)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (12)

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

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

Equations (15)

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

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

Metrics

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

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