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A night vision device (English Night Vision Device or in the abbreviation NVD) works optoelectronically. This technique can make it possible to see in total darkness. A distinction is made between 2 variants, on the one hand there are residual light intensifiers and on the other hand devices that work with thermal imaging technology.
A thermal imaging device depicts heat sources such as a living being or a heating pipe in temperature ranges, blue colors tend to be too cold, red colors too warm. The technology behind it is a thermal imaging detector (microbolometer) that can display long-wave infrared light in the range of 8 to 13 µm. A heat source of more than 0 Kelvin (- 273 °C generates this infrared light. A thermal imaging camera works at night, but also in daylight. The lenses used are not made of glass, because the material is impermeable to infrared radiation, so observation does not work through a window or a car window.Therefore, a special mix of materials is used, which can consist of germanium, zinc sulfide, zinc selenite and chalcogen.These materials are very expensive, which also justifies the high price of the device.
Thermal imaging devices differ based on these parameters:
• Equipment such as WiFi, video recorder, battery
• Detector resolution in pixels
• Pixel size in pitch
• Sensitivity in mk
• Refresh rate in hearts
• Lens diameter
• Quality of the lenses
• Software image quality support