April 19, 2011
Far-sighted Space Technology Finds Practical Uses On Earth
Technology developed for space missions to study the most distant objects in the Universe is now finding a host of practical applications back on Earth. QMC Instruments Ltd., in partnership with the Astronomical instrumentation Group at Cardiff University, has built instruments for many major space missions, including Herschel and Planck. Now, expanding on that experience they are developing KIDCAM, a kind of detector that could have applications in hospitals, factories and airports. Ken Wood will present the project at the RAS National Astronomy Meeting in Llandudno, Wales, on Tuesday 19th April.
The part of the Electromagnetic Spectrum including the far infra red and microwave is also called 'terahertz' radiation. Astronomers use this kind of radiation to study the Cosmic Microwave Background and the huge dust clouds where stars are born. The sensitive detectors they use will only operate at temperatures very close to absolute zero (minus 273C.) In Terahertz cameras like KIDCAM, those low temperatures are accessible in compact and less expensive ways using relatively new cooler technology. KIDCAM therefore has many potential day-to-day applications.
Until recently, there have been many practical obstacles to using terahertz detectors. Terahertz sources have only become available to the non-specialist in the last 10 years and cooling the detectors to very low temperatures using liquid cryogens is costly and complicated.
"The instruments aboard the Herschel and Planck satellites need to be cooled to temperatures close to absolute zero so that emissions from the spacecraft don't drown out the faint signals that come from the very edge of the observable Universe," said Ken Wood. "For KIDCAM, we have developed a kind of detector that can be operated in electrical coolers and therefore without the use of liquified gases. KIDCAM can be tuned to specific frequencies for specific applications, for instance to enhance the contrast between skin and plastic explosive for airport security scanners. Unwanted frequencies can be blocked to increase the camera's sensitivity. The experience that we gained working on astronomical missions has been invaluable in helping us do this. The race is now on around the world to produce devices that will realize the enormous potential of terahertz science and thanks to the ingenuity of UK astronomers we have made a great start."
Image 1: Herschel in space, close up on its mirror. Credits: ESA (Image by AOES Medialab)
Image 2: Planck telescope focal plane unit. Credits: ESA (Image by AOES Medialab)
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