Active polarimetric imaging of solid targets – Depolarization and reflectivity analysis

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Authors
  1. Cao, X.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);AEREX Avionics Inc, Breakeyville QUE (CAN)
Abstract
Measurements of solid targets depolarization and reflectivity signatures were performed using a polarization imaging lidar. The lidar consists of a Q-switched laser operating at 532 nm, a telescope and a gated intensified CCD camera from Andor. Over 70 different materials have been examined. The different materials consist of different insulation materials, woods, metals, sand papers, concrete, wet/dry sands and environmental targets. Four incident angles measurements were conducted to examine the influence of light incident angle on the targets depolarization signature and reflectivity. The main observations are: (1) Metal targets show little depolarization but large reflectivity for incidence angle close to 0° their reflectivity drops rapidly with an increase of the incident angle while depolarization increases. (2) Randomly oriented materials targets with high reflectivity show high depolarization ratio, and low reflectivity are associated with low depolarization ratio. Their depolarization ratios are almost not dependent on the light incident angle. (3) The circular depolarization ratios are typically 2 to 3 time larger than the linear depolarization ratios.

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Report Number
DRDC-VALCARTIER-CR-2010-362 — Contractor Report
Date of publication
01 Nov 2010
Number of Pages
60
DSTKIM No
CA034700
CANDIS No
534196
Format(s):
Electronic Document(PDF)

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