Infrared polarization in the natural Earth environment

Shaw, Joseph A.

doi:10.1117/12.456604

Cited by 10 publications

(2 citation statements)

References 24 publications

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“…In the application of infrared polarization imaging for target recognition, artificial targets exhibit a higher degree of polarization than natural backgrounds [2][3][4] . According to the available published literature data 5,6 , the measured degree of infrared polarization of the natural environment is very small, of which vegetation is generally less than 0.5% of polarization, rocks, bare soil, and other mountainous landscapes are generally between 0.5% to 1.5% of polarization, and only water show strong polarization characteristic and its polarization are generally in the range of 8% to 10%. And the degree of infrared polarization of various artifacts, such as roads and house buildings, is usually greater than 1.5%, among which the polarization of artifacts made of metallic materials, such as automobiles and airplanes, shows 2% to 7% of polarization.…”

Section: Introductionmentioning

confidence: 99%

Study on polarimetric calibration method for multispectral division of focal plane polarimeter

Chi

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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Section: Introductionmentioning

confidence: 99%

Study on polarimetric calibration method for multispectral division of focal plane polarimeter

Chi

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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“…and is dependent upon wavelength and incidence angle. Our emissivity calculation should be most affected by polarization sensitivity of the FTIR spectrometer at the incidence angle with maximum dop, which is 75° for radiation between 8 and 14 µm [Shaw 2002b]. To test this hypothesis, we added a vertical polarization sensitivity to the model until the difference between the data and model was minimized, which occurred with the addition of only 6.3% vertical polarization.…”

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confidence: 99%

Infrared emissivity of seawater and foam at large incidence angles in the 3–14 μm wavelength range

Branch

Chickadel

Jessup

2016

Remote Sensing of Environment

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The emissivity of the sea surface is an important parameter for infrared measurements at large incidence angles, and the increased radiance of foam from breaking wave crests, attributed to the higher emissivity of foam over foam-free water, has not been confirmed experimentally at angles above 65°. Here we report on outdoor laboratory experiments performed to confirm model predictions of a dramatic decrease in seawater emissivity at large incidence angles and to provide the first measurements of foam emissivity in this regime. A method is presented using Fourier transform infrared (FTIR) spectroscopy to measure the spectral emissivity of seawater and foam at incidence angles from 60° to 85° and wavelengths from 3.5-5.5 and 8-14 µm. The emissivity of water and foam are found to decrease dramatically for incidence angles above 65°, with the decrease being less dramatic for foam than for water. The emissivity of foam is found to be higher than that of water for all wavelengths and incidence angles above 65° where the difference is statistically significant. The difference between the emissivity of foam and the emissivity of water increases with incidence angle and reaches a maximum of 0.23 at 8.9 µm and 85° incidence. The significant difference between the emissivity of foam and water should be accounted for in infrared models of the sea surface at large incidence angles.

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