The hottest laser polarization detection shows the
2022-10-19- Detail
On June 20, engineers at the Massachusetts Institute of Technology (MIT) announced the development of a new laser polarization detection technology, which can not only determine the location of space debris, but also analyze its composition
on earth's space orbit, hundreds of millions of space debris rotate at high speed, posing a great threat to spacecraft and satellites. At present, NASA (NAS "polyurethane is a good thing a) and the Department of defense are using land-based telescopes and lidars It tracks 17000 pieces of debris, but this system can only determine the location of the target. Researchers pointed out that the new technology and the cooperation of this expertise and products can analyze what constitutes a piece of debris, which helps to determine its mass, momentum and possible destructive power
this technology uses laser to detect the polarization effect of materials on light. Michael Pascoe of MIT Aerospace Department said that the polarization mode of reflected light of paint is obviously different from that of metal aluminum, so identifying the polarization characteristics is a reliable method to identify space debris
to test this theory, researchers designed a laser polarimeter to detect the angle of reflected light. The laser wavelength used is 1064 nm, which is similar to ladars laser. Six materials commonly used in satellites are selected: white, black paint, aluminum and titanium, as well as two membrane materials polyimide and Teflon (polytetrafluoroethylene) to protect satellites. Polarization filters and silicon detectors are used to detect the polarization state of their reflected light. They identified 16 main a-polarization states of the total area of the friction surface of the test piece, and corresponding these state characteristics to different materials. The polarization characteristics of each material are unique enough to distinguish it from the other five once it has the adverse effect of electrocution
Pascal believes that other aerospace materials, such as protective films, composite antennas, solar cells, circuit boards, etc., may also have their own polarization effects. He hopes to build a database containing the polarization characteristics of various materials with a laser polarimeter, install a filter on the existing land-based ladars, and then directly detect the polarization state of the space debris. By comparing with the data in the feature database, the composition of the debris can be determined
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