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20 January 2005 Photothermoplastic-based airborne camera for remote sensing applications
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Photo-thermo-plastic film (PTPF) is a multi-layer structure with the resolving power up to 1000 line pairs per millimeter in the binary and/or half-tone optical data recording modes. These structures are high-sensitive in the spectral range from 400 to 800 nm which is determined by chalcogenide glassy semiconductors (CGS) layer in the PTPF. We technologically challenged the CGS by tin-doping; this allows satisfying to main requirements which high-efficient observation systems are demanding. PTPF-based devices imply some critical elements for providing PTPF sensitization by means of the corona discharge as well as thermal development of the latent image to the form of superficial relief on the PTPF. Such PTPF-based slit camera was used for airborne monitoring of the Black Sea surface from the 9000-m-altitude. Camera resolving power is high enough for determining of waves heights and spacing as well for discovering of small sea objects and determining of their speed and drift direction. PTPF-based remote sensing seems to be even more advantageous due to the possibility to record different images multiple (up to 100) times on a single PTPF frame within the "recording - read-out - thermal erasing - re-recording" cycle. An algorithm for automatic measurements of the sea surface conditions is proposed. The measured parameters are height and spacing of waves as well as their motion direction. Mathematical processing includes 2-D smoothing of sample data, forming 1-D profile of the waves, and calculating its Fourier transform. By introducing of the scale factors, it makes possible to obtain certain data on the waves' characteristics. This system allows compressing of 2-D information to numerical data flow which is characterizing the rough seas and transmitting of these data through communication channels.
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Vasile K. Rotaru, Ion S. Andriesh, Igor V. Dementiev, Oleg Ya. Korshak, Sevastyan N. Neamtu, Stephan V. Robu, Hossin Ahmed Abdeldayem, Nickolai V. Kukhtarev, and Igor V. Ciapurin "Photothermoplastic-based airborne camera for remote sensing applications", Proc. SPIE 5656, Active and Passive Remote Sensing of the Oceans, (20 January 2005);

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