TY  - GEN
N2  - An imaging polarimetric slope sensing instrument for measuring water waves has been developed.
From themeasurement of the intensities of three different linear polarization states,
it is possible to determine the first three components of the polarization Stokes vector. The
slope of the water surface is computed from the measurement of the polarization of reflected
light. Unlike in common polarimeters, custom optics are not required in this simple setup
consisting of three cameras aligned in parallel and each equipped with a standard polarization
filter. The trade-off for the simple setup is the need for more extensive system calibration
and image post-processing. The camera setup was fully calibrated (extrinsic, intrinsic,
and distortion parameters) with a specialized calibration procedure using a custom built target.
The analyzer matrix, which transforms the intensities of the measured polarization states
into the Stokes vector components was determined and verified experimentally. A data set
collected during an experiment on board the research vessel Meteor is analyzed. In an experiment
at the Hamburgische Schiffsbau-Versuchsanstalt, the polarimeter was successfully
operated under laboratory conditions. It is shown to be capable of measuring the slope distribution
of mechanically generated waves. Elevation power spectra, determined by integration
of the slope measurements, show good agreement with reference measurements with a wave
wire. Deviations at low wave frequencies due the small size of the polarimeter footprint can
be compensated with a transfer function that is derived from the measurements.
TI  - Development of an imaging polarimeter for water wave slope measurements
CY  - Heidelberg
A1  - Bauer, Paulus Salomon
AV  - public
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/15899/
Y1  - 2013///
ID  - heidok15899
ER  -