Abstract

The described system measures the flow velocity without directional ambiguity. It does not need an optical frequency offset. Polarized illumination beams and two optical detection channels with appropriate polarizing elements are used to determine the flow direction. The Doppler signals from the two channels are identical but have a phase offset that changes sign if the flow direction is reversed. The method has been verified experimentally for low and high concentrations of scattering particles.

© 1974 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Directional Laser Doppler Velocimeter

O. Lanz, C. C. Johnson, and S. Morikawa
Appl. Opt. 10(4) 884-888 (1971)

Nonmechanical axial scanning laser Doppler velocimeter with directional discrimination

Koichi Maru and Takahiro Hata
Appl. Opt. 51(20) 4783-4787 (2012)

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 (5)

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 (10)

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