Characterization of the goniometer optical entrance Field of View (FOV) and definition of the acquisition procedures for the acquisition of valid measurements

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Authors
  1. Levesque, M.P.
  2. Dissanska, M.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN)
Abstract
This report contains the results of the characterizations of the Field of View (FOV) and projected footprint (on the sampling surface) of the goniometer optical sensor, which was developed in the Spectral and Geospatial Exploitation (SGE) section of DRDC Valcartier. It shows that the goniometer has a very uniform spectral response everywhere in the FOV but that the sensitivity has a Gaussian-like profile. The sensor optic is well collimated and the footprint projected on the target sample has the expected size. For the production of calibrated BRDF signatures, this report presents two acquisition procedures. They consider the spectrometer sensitivity to the polarization (which generates measurement artefacts) and the non-uniformity sensitivity of the sensor FOV. These procedures produce calibrated measurements, where the measurement artefacts are cancelled. The first method (systematic comparison with the Spectralon of reference) is accurate but very long to execute. The second method is faster to execute but requires the knowledge of the ‘Goniometer Measurement-Error Function’, which is also describe in this report.

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Keywords
spectrometer;FOV;field of view;spectral response;goniometer;polarizers;waveplate;calibration
Report Number
DRDC-RDDC-2015-R189 — Scientific Report
Date of publication
01 Sep 2015
Number of Pages
46
DSTKIM No
CA042202
CANDIS No
803391
Format(s):
Electronic Document(PDF)

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