In order to study the polarization imaging characteristics of sea targets in the long-wave infrared spectrum, a set of real-time polarization imaging experimental devices were built using the focal plane long-wave infrared polarization detectors, and experiments were carried out on typical laboratory targets, and the device was used to carry out ship-borne sea surfaces. Long-wave infrared polarization imaging of typical targets. Separate 0°, 45°, 90° and unbiased infrared intensity images from the directly obtained micro-polarization array images, and use the stokes vector method to calculate the polarization degree and polarization angle of the image. The image quality is evaluated through image clarity. The clarity of polarized images is more than 20 times higher than that of infrared images, and the clarity of polarization angle images is 8~10 times higher than that of infrared images. The experimental results show that after the polarization dimension is increased, both intuitive observation and quantitative analysis can find that the clarity of the long-wave infrared polarization image is significantly improved, and the target detection ability is improved.
We have designed and experimentally demonstrated a periodic multilayer structure of SiO2 and Cr thin interlayers to achieve an ultra-broadband perfect absorber based on optical admittance matching method. The successive Nano-Cr-film make significant contribution to improving the absorption intensity of the structure. Measurements reveal high absorption over 85%, when averaged over the range 0.4–7.2 μm. Remarkably, it is the most broadband planar absorber film without involving lithography in fabrication. Incident angle and polarization dependence of the absorption spectra are also considered. The manufactured absorber also has potential applications for thermal shielding, detecting, imaging, photovoltaics (PVs), sensing, etc.
In this paper, the infrared radiation characteristics of sea background have been studied. First, MODTRAN4.0 was used to calculate the transmittance of mid-infrared and far-infrared, and the solar spectral irradiance, the atmospheric and sea surface radiation. Secondly, according to the JONSWAP sea spectrum model, the different sea conditions grid model based on gravity wave theory was generated. The spectral scattering of the sun and the atmospheric background radiation was studied. The total infrared radiation of the sea surface was calculated. Finally, the infrared radiation of a piece of sea surface was mapped to each pixel of the detector, and the infrared radiation is simulated. The conclusion is that solar radiance has a great influence on the infrared radiance. When the detector angle is close to the sun’s height angle, there will be bright spots on the sea surface.
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