When the laser through the atmosphere ,air molecules and aerosol particles can cause scattering
of laser transmission process,attenuation of laser energy ,and also change the polarization
characteristics of laser,in the end the change will affect the result of the last detected image.
On the problem of polarization atmospheric transmission theory imperfection,solve the scattering
amplitude functions about the scattering of homogeneous spherical particle and the scattering cross
section function from Maxwell's electromagnetic field equation, at the same time, carry out the
theoretical research of polarized light scattering characteristics in different medium based on
Stokes-Mueller matrix,focus on the character of polarization scattering, conclusion the change rules
of polarization state ,degree of polarization,and other polarization parameters,and analysis the
relationship of the concentration of transmission medium, transmission distance and the particle
diameter by computer numerical simulation.
The result indicates that depolarization factor of polarized light is closely related to the
concentration of transmission media, the distance of transmission, the particle diameter, revealing
that the higher concentration of transmission media, the more obvious depolarization phenomenon
which establishes the fundamental of the target being recognized better for the presenting image of
depolarization
Polarized infrared imaging technology is a new detection technique which own the ability of spying through the fog, highlighting the target and recognizing the forgeries, these characters make it a good advantage of increasing the work distance in the fog. Compared to the traditional infrared imaging method, polarized infrared imaging can identify the background and target easily, that is the most distinguishing feature of polarized infrared imaging technology. Owning to the large refractive index of the infrared material, temperature change will bring defocus seriously, athermal infrared objective is necessarily. On the other hand, athermal objective has large total length, and hard to be integrated for their huge volume. However telephoto objective has the character of small volume and short total length. The paper introduce a method of polarized and athermal infrared telephoto objective which can spy the fog. First assign the optical power of the fore group and the rear group on the basis of the principle of telephoto objective, the power of the fore group is positive and the rear group is negative; then distribute the optical power within each group to realize the ability of athermalization, finally computer-aided software is used to correct aberration. In order to prove the feasibility of the scheme, an athermal optical system was designed by virtue of ZEMAX software which works at 8~12 µm, the focal length of 150mm, F number is 2, and total length of the telephoto objective is 120mm. The environment temperature analysis shows that the optical system have stable imaging quality, MTF is close to diffraction limit. This telephoto objective is available for infrared polarized imaging.
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