Recent developments in cooled mercury cadmium telluride (MCT or HgCdTe) infrared detector technology make possible the introduction of high end infrared cameras to be used in a multitude of demanding thermal imaging applications. These infrared cameras are actually provided with spectral sensitivity within the shortwave, mid-wave and lengthy-wave spectral bands or else in 2 bands. Additionally, a number of camera resolutions can be found because of mid-size and enormous-size detector arrays as well as other pixel sizes. Also, camera features now include high frame rate imaging, adjustable exposure some time and event triggering enabling the capture of temporal thermal occasions. Sophisticated processing algorithms can be found that lead to an expanded dynamic range to prevent saturation and optimize sensitivity. These infrared cameras could be calibrated so the output digital values match object temperatures. Non-uniformity correction algorithms are incorporated which are separate from exposure time. These performance abilities and camera features enable an array of thermal imaging applications which were formerly difficult.
In the centre from the high-speed infrared camera is really a cooled MCT detector that gives remarkable sensitivity and flexibility for viewing high-speed thermal occasions.
- Infrared Spectral Sensitivity Bands
Because of the accessibility to a number of MCT detectors, high-speed infrared cameras happen to be made to be employed in several distinct spectral bands. The spectral band could be manipulated by different the alloy composition from the HgCdTe and also the detector set-point temperature. It makes sense just one band infrared detector with remarkable quantum efficiency (typically above 70%) and signal-to-noise ratio in a position to identify very small amounts of infrared signal. Single-band MCT detectors typically fall within the five nominal spectral bands proven:
• Short-wave infrared (SWIR) cameras – visible to two.5 micron
• Broad-band infrared (BBIR) cameras – 1.5-5 micron
• Mid-wave infrared (MWIR) cameras – 3-5 micron
• Lengthy-wave infrared (LWIR) cameras – 7-10 micron response
• Very Lengthy Wave (VLWIR) cameras – 7-12 micron response
Additionally to cameras that utilize “monospectral” infrared detectors which have a spectral response in a single band, new systems are now being developed that utilize infrared detectors which have an answer in 2 bands (referred to as “two color” or dual band). These include cameras getting a MWIR/LWIR response covering both 3-5 micron and seven-11 micron, or else certain SWIR and MWIR bands, or perhaps two MW sub-bands.