Infrared screening smokes

But for military applications only visible, infrared and microwave bands are useful. Visible band comprises visible light (0.40-0.75 pm) which is the only part of entire spectrum that can be seen by human eye. Radiation covering the 

1) Near IR (NIR) band lies just beyond the visible portion of the spectrum, that is, 0.75-3.0pm. 

2) Mid IR (MIR) band cannot be seen, but can be easily detected with electro-optical devices that is, 3.0-6.0pm. 

3) Far IR (FIR) band, that is, 6.0-15.0pm is actually the real heat portion of the IR band. This is where we use extremely sensitive heat-sensing systems to pick up and contrast the subtle differences in temperatures between an object and its background. 

All objects above absolute zero temperature (-273 °C) emit electromagnetic radiation in the IR region. Further, the emission of IR radiation is theoretically based on the concept of black body which is considered a perfect and efficient emitter. As the temperature of the object increases, wavelength of maximum emission shifts to the shorter wavelength region and therefore radiant energy is emitted in the IR and visible range. 

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The future research in this area would focus on development of more efficient and environmentally compatible and biodegradable WP- and RP-based smoke formulations. These formulations should also be safe to manufacture and handle and at the same time, more effective in screening in the various regions of the electromagnetic spectrum that is, visible, infrared and millimetric wave bands. 

Military Concealment Operations. Deliberately generated smokes are used in military situations for local visual concealment of troop operations, such as movement and placement of artillery and other fire capabilities. They may also be employed against opposing forces to cause impairment of coordinated and operational activities. Generally these are white/gray smokes. Additionally, some screens are used for infrared obscuration purposes. 

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