Abstract

An experimental assessment of the scattering behavior of freely falling artificial raindrops and mechanically suspended drops in the ice and mixed phase has been undertaken with a device which simultaneously measures the parallel and cross polarized components of backscattered linearly polarized laser light (6328 Å). Among the findings are that linear depolarization ratios (δ) are generally <0.01 for raindrops up to nearly 6-mm diam, near 0.5 for regularly shaped frozen drops, and between 0.35 and 1.0 for more irregular ice particles. Anomalous scattering behavior has been observed during the liquid to solid drop phase transition (δ > 1.0) and in the relatively great amounts of parallel polarized energy returned from raindrops >~4 mm. Backscattered signal variations produced during drop melting reveal that δ values tend to remain near the initial ice value until most of the ice has changed phase. The details of the variations aid in the determination of the dominant scattering mechanisms responsible for the backscatter from large, near-spherical particles. The results are shown to have some bearing on measurements of atmospheric hydrometeors obtained by lidar.

© 1977 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Backscattering cross sections for hydrometeors: measurements at 6328 Å

Kenneth Sassen
Appl. Opt. 17(5) 804-806 (1978)

Angular scattering and rainbow formation in pendant drops

Kenneth Sassen
J. Opt. Soc. Am. 69(8) 1083-1089 (1979)

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 (7)

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

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