Superposition Fabry–Perot filter array for a computational hyperspectral camera

Abstract

Computational hyperspectral cameras with broadband encoded filter arrays enable high precision spectrum reconstruction with only a few filters. However, these types of hyperspectral cameras have limited application, because it is difficult for conventional encoded filter arrays to balance among the spectrum regulation capacity, angle insensitivity, and processibility. This Letter presents a new, to the best of our knowledge, encoded filter composed of superposition Fabry–Perot resonance cavity (SFP) that can simultaneously take all three aspects into consideration. By learning the parameters of an SFP encoder and a neural network decoder in an end-to-end manner, a computational hyperspectral camera based on an SFP filter array presents up to 2.24 times higher spectral reconstruction accuracy, 10 times wider working angle, and can be produced with a low-cost manufacturing process.

Research on hyperspectral polarization detection for unexploded ordnance target identification

“…Unexploded ordnance (UXO) is a worldwide problem and a long-term hazard that can remain active and destructive for decades after the end of a conflict, thereby endangering humanity, making the rapid and effective detection of UXO of great importance to human civilization [1] . Spectral polarization imaging technology can obtain two-dimensional spatial information, one-dimensional spectral information, and polarization state information such as Degree of linear polarization(DoLP), Angle of linear polarization(AoLP), polarization ellipticity and rotation direction of the target, thus characterizing some information that is more difficult to characterize with intensity measurements, such as the chemical composition properties, roughness, surface texture characteristics and edge information of the target surface [2][3][4][5][6] . Compared to conventional light intensity detection, greatly increasing the information content of remote sensing data, which is of great value for target detection, especially in military applications [7] .…”