Almost all thermal imaging cameras incorporate a NUC, (Non-Uniformity Correction) plate. NUC (shutters) at pre assigned intervals to re-calibrate the array to a fixed temperature.
This refers to the number of active pixels that the thermal imaging array has in its armory. Our QVGA core has 384X288 pixels (110,592 active pixels) whereas our VGA is 640X480 pixels (307,200 active pixels) The more active pixels, the better picture quality.
The main advantages of thermal imaging are; Visibility at night without lighting, Visibility through fog, rain, snow, smoke etc.. It can also allow long range visibility beyond the range of conventional IR type of products. In particular, Thermal cameras are perfect for;
- Navigation and Situational Awareness
- Collision Avoidance
- Man Overboard
- Perimeter & Harbor Security
- Customs Inspection
- Anti Piracy and counter terrorism
Thermal imaging cameras allow objects with any heat signature to be seen in total darkness, through fog, smoke or other adverse conditions. Thermal Imaging Cameras were first deployed for military applications as early as the mid 1050’s. early systems were originally cooled using liquid nitrogen which made them extremely expensive and the technology was classified for military applications only.
By the 1970’s the US military had decided to embark on a strategy to equip each soldier with personal thermal imaging equipment. – This lead to the creation of the first un-cooled (without liquid nitrogen) Thermal Imaging Detectors which were both smaller and far less expensive.
With the creation of the uncooled engines came military declassification which lead to the adoption of thermal imaging technology in an array of markets such as law enforcement, search and rescue and maritime.
Infra red radiation from specific wavelengths passes through the lens onto an element known as a microbolometer.
The Microbolometer is made from either Vanadium Oxide (VOx) or Amorphous silicon (a-Si)layer that has a wide temperature range coefficient.
The differences in scene temperature are converted into electrical signals which are processed into an image.
A bolometer is a small plate that floats above the surface of a Read Out Integrated Circuit (ROIC). The temperature of the plate changes when a photon falls on it. The differences in temperature on the microbolometer effect the electrical resistance of the layer and build up a “scene”.