SWIR - (Short Wave Infrared)
SWIR is an acronym for Short Wave InfraRed. It refers to the wavelengths from 0.9 to 1.7 microns.
The main advantages of using SWIR technology in military applications is that SWIR cameras often “see through” and generate high contrast images in adverse environments. Especially compared to visible images through challenging weather conditions.
Conditions such as Fog, Haze, Rain and Dust are all penetrated by SWIR Imaging due to the reduced Rayleigh scattering of the longer wavelengths it utilizes when compared to visible imaging.
The short wave infrared (SWIR) portion of the spectrum offers unique capabilities, often complementary to LWIR and MWIR imaging. Imaging in SWIR uses reflected light, much like the slightly shorter wavelengths of the visible spectrum.
Many SWIR systems are marketed as low light or as good camera systems for complete darkness. This isn't actually always the case (such as with long range). Since, unlike MWIR and LWIR, SWIR imaging does not depend on the intrinsic black body emissivity of target objects, therefore it is usually not refered to as a form of thermal imaging. Thismeans that SWIR requires illumination in long range scenarios.
Infiniti is currently developing an effective Long Range SWIR Illuminator for such applications.