The F 117 a stealth fighter helped the US win the Gulf war. Stealth technology which makes ships and planes invisible to ground radar, has been a closely guarded secret of developed nations. Now some Indian scientists have made a breakthrough in this area.
Scientists at the indian institute of technology in Roorkee (IIT-R) have developed a special Nanocomposite coating that can absorb microwaves; when applied on specially designed aircraft, they become almost invisible to radar.Radars emit pulses of microwave radiation that are reflected off the body of flying aircraft. But the special coating absorbs most of the incident radiation and reflect very little. The shape of the aircraft must also be such that it deflects the microwaves in every other direction, other than the path back to the radar. And that’s how an aircraft becomes invisible on the radar. The Nanocomposite coatings have been developed by Rahul Sharma and his team at IIT-R.
They unveiled their work at an international nanomaterials conference, held at the Indian Institute of Science Sharma believes their nano-product is a significant step in developing a technology to enable aircraft escape radar surveillance.The IIT team found that crystals of ‘barium hexaferrite’ with particle size of 10-15 nanometres have the ability to absorb microwaves.
Also the team developed a special process for synthesising the nanopowder and formulating it as a coating. Rahul Sharma said that the nanocomposite coating on aluminium sheet absorbed 89 percent of incident microwaves at 15 GHz–the frequency normally used by radars–reflecting only 11 percent.
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