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Photothermal spectroscopy is a group of high sensitivity spectroscopy techniques used to measure optical absorption and thermal characteristics of a sample. The basis of photothermal spectroscopy is the change in thermal state of the sample resulting from the absorption of radiation. Light absorbed and not lost by emission results in heating.
Due to the use of thermal imaging, the AN/PAS-13B does not require low levels of light to operate, and it will not shut off like most night vision if hit directly by light. The thermal imaging sensor within the sight requires a low temperature to operate, so a cool-down time of less than 2 minutes is required at startup. The AN/PAS-13B comes in ...
The thermo-optic coefficient of a material is the change in refractive index with the response to temperature. This value itself also depends on the present temperature of the material and so has second-order behaviours.
Athermalization, in the field of optics, is the process of achieving optothermal stability in optomechanical systems. This is done by minimizing variations in optical performance over a range of temperatures. [1] [2] Optomechanical systems are typically made of several materials with different thermal properties.
Distributed temperature sensing systems (DTS) are optoelectronic devices which measure temperatures by means of optical fibres functioning as linear sensors.Temperatures are recorded along the optical sensor cable, thus not at points, but as a continuous profile.
PNK-6. The PNK-6 (Ukrainian: ПНК-6) is a Ukrainian commander's panoramic tank optic used on the T-84 Oplot-M tank. It was developed by the Sokol Central Design Bureau (TsKB Sokol) and later by its successor NPK Fotopribor (now part of UkrOboronProm) which produced the optic.
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Many thermal imagers, including some forward-looking infrared cameras (such as some LWIR enhanced vision systems (EVS)) are also uncooled. Medium-wave (MWIR) cameras operate in the 3–5 μm range. These can see almost as well, since those frequencies are less affected by water-vapor absorption, but generally require a more expensive sensor ...
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