Post by Enchant on Oct 27, 2006 9:45:19 GMT -5
Earth is moving up in the technology world. Although we havent begun to cloak a a space ship , we have made a break through in cloaking technology. we have read a couple articles about the testing of invisibility, well there seems to have been a break through a leap towards the future...I think you will be impressed....
A US-British team of scientists has successfully tested a cloak of invisibility in the laboratory. The device mostly hid a small copper cylinder from microwaves in tests at Duke University, North Carolina. It works by deflecting the microwaves around the object and restoring them on the other side, as if they had passed through empty space. But making an object vanish before a person's eyes is still the stuff of science fiction - for now. The cloak consists of 10 fibreglass rings covered with copper elements and is classed as a "metamaterial" - an artificial composite that can be engineered to produce a desired change in the direction of electromagnetic waves. Like visible light waves, microwaves bounce off objects, making them apparent and creating a shadow. But at microwave frequencies, the detection has to be made by instruments rather than the naked eye. Water behaves differently. When water in a river flows around a smooth rock, the water closes up on the opposite side.
Someone looking at the water downstream would never guess it had passed around an obstacle. The metamaterial cloak channelled the microwaves around the object like water flows around the rock. "These metamaterials have opened a new chapter in electromagnetism. We've opened the door into the secret garden," co-author Professor John Pendry, from Imperial College London, told BBC News.
Source:BBC News
A US-British team of scientists has successfully tested a cloak of invisibility in the laboratory. The device mostly hid a small copper cylinder from microwaves in tests at Duke University, North Carolina. It works by deflecting the microwaves around the object and restoring them on the other side, as if they had passed through empty space. But making an object vanish before a person's eyes is still the stuff of science fiction - for now. The cloak consists of 10 fibreglass rings covered with copper elements and is classed as a "metamaterial" - an artificial composite that can be engineered to produce a desired change in the direction of electromagnetic waves. Like visible light waves, microwaves bounce off objects, making them apparent and creating a shadow. But at microwave frequencies, the detection has to be made by instruments rather than the naked eye. Water behaves differently. When water in a river flows around a smooth rock, the water closes up on the opposite side.
Someone looking at the water downstream would never guess it had passed around an obstacle. The metamaterial cloak channelled the microwaves around the object like water flows around the rock. "These metamaterials have opened a new chapter in electromagnetism. We've opened the door into the secret garden," co-author Professor John Pendry, from Imperial College London, told BBC News.
Source:BBC News