Polarization switching lidar device and method

Details Polarization switching lidar device and method Polarization switching lidar device and method

2010-01-25

2011-11-08

Ton, Tri T (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C356S337000

Reexamination Certificate

active

08054464

ABSTRACT:
A polarization switching lidar device is arranged for remote detection and characterization of airborne aggregations of particulates. It includes a pulsed laser, a mirror, a polarizing beam splitter, an actively controlled retarder arranged to be controllably alternated between a zero retardation state and a quarter-wave retardation state such that the transmitted portion of the exiting laser light beam is linearly polarized in a predetermined direction when the actively controlled retarder is in the zero retardation state, while being circularly polarized in a predetermined rotational sense when the actively controlled retarder is in the quarter-wave retardation state. A directable telescoping assembly is arranged to collect photons backscattered by the airborne aggregations of particulates and to redirect the collected portion of depolarized backscattered photons onto the polarizing beam splitter. A photodetector is arranged to generate at least one electronic signal proportional to the collected portion of depolarized backscattered photons.

REFERENCES:
patent: 5721632 (1998-02-01), Billmers et al.

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