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Terahertz detection at a distance

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Marie Freebody, [email protected]

When it comes to safe screening and detection, terahertz imaging offers considerable advantages but one major drawback. Terahertz waves occupy a large segment of the electromagnetic spectrum between the infrared and microwave bands and can provide imaging and sensing capabilities not available through conventional technologies such as x-ray and microwave. But remote sensing using broadband terahertz waves remains a great challenge for scientists due to the high absorption of terahertz waves by water vapor in the atmosphere. Now, thanks to researchers at Rensselaer Polytechnic Institute...Read full article

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    Published: October 2010
    Glossary
    broadband
    Indicating a capability to deal with a relatively wide spectral bandwidth.
    microwave
    An electromagnetic wave lying within the region of the frequency spectrum that is between about 1000 MHz (1 GHz) and 100,000 MHz (100 GHz). This is equivalent to the wavelength spectrum that is between one millimeter and one meter, and is also referred to as the infrared and short wave spectrum.
    spectrometer
    A kind of spectrograph in which some form of detector, other than a photographic film, is used to measure the distribution of radiation in a particular wavelength region.
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