The new model of ASTROHN-275F14 long-range IR lensadmin
ASTROHN Technology Ltd has developed and launched 8-14 µm IR lenses with a focal length of 275 mm.
This telephoto lens has no mass-produced analogs in Russia and has a number of significant advantages compared to foreign analogs. The weight of the lens is only 3.5 kg. Weight reduction is achieved through the use of light alloys in the design.
The use of an optical scheme consisting of three lenses made of germanium and zinc selenide with aspherical surfaces made it possible to significantly reduce the size and magnitude of optical aberrations. At the same time, the integrated transmission of the lens is more than 90%.
Polychromatic OTF (for 8-12 µm wavelength range)
Monochromatic OTF (for 10 µm wavelength)
The relative aperture and high transmittance, which is large for such a focal length and overall dimensions, provides a higher illumination of the sensitive element, which, in turn, has a positive effect on the detection range and recognition of the monitored objects.
During the tests, the detection ranges of the human figure and a passenger car at distances of 6 km and 10 km, respectively, were achieved.
It was possible to achieve such high results in a mass-produced product, largely due to the launch of its own line for growing and controlling single-crystal germanium and its modernization for growing crystals of large diameter (up to 220 mm). The closed production cycle (from design to assembly and testing of the finished product) and quality control of all components of the product at each stage ensured high quality and stability of serial lenses.
The achieved results on the observation range and reduced weight and size characteristics of ASTROHN-275F14 IR lens allow it to be used to create surveillance systems with two IR channels with different focal lengths:
This design scheme helps avoid a number of problems associated with the use of a traditional zoom lens.