Affiliation:
1. NASA Langley Research Center
2. University of Virginia
3. Auburn University
Abstract
A multispectral imaging system, based on a modified plenoptic camera,
is presented. By adding a color filter in the aperture plane of the
imaging system, it is possible to simultaneously image multiple
discrete colors of light—seven in this design. To develop a
measurement system that does not rely on in
situ calibrations, each of the optical elements was
characterized a priori. For the camera
sensor, measurements of the exposure linearity, exposure duration, and
quantum efficiency were measured. Additionally, the transmission of
the optical filters, both spectral and neutral density, as well as the
signal attenuation of the filter holder itself were measured. These
measurements result in an instrument that can quantitatively image the
emission of seven discrete spectral bands simultaneously. An example
application of pyrometry is presented where the emission of a
blackbody calibration source with known temperature was imaged. It was
determined that by fitting the measured emission at seven wavelengths
to Planck’s law of radiation, the temperature could be determined to a
mean difference of 0.65ºC across five temperatures from 600° to 1000ºC
when compared to the set-point temperature.
Funder
Langley Research Center
National Aeronautics and Space
Administration
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
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