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Meadowlark Optics - Wave Plates 6/24 LB 2024

Terahertz Computed Tomography Helps ID Chemical Substances

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Ankia Brahm and Andreas Tünnermann, Fraunhofer Institute for Applied Optics and Precision Engineering (IOF) and Institute of Applied Physics (IAP) of Friedrich Schiller University; Felix Wichmann, Carsten Gerth, Maryna Tymoshchuk, Stefan Riehemann and Gunter Notni, Frienhofer IOF

As radiation sources become more efficient, detectors become more sensitive, and acquisition speeds up, terahertz computed tomography holds promise for nondestructively finding and distinguishing between different materials by visualizing spatial information and distribution within a sample. Working in the range of 1011 to 1013 Hz and 30 µm to 3 mm, terahertz radiation penetrates paper, clothing, plastics, ceramics and dry wood. It also is highly sensitive to water and to many organic substances that can be identified by their characteristic absorption spectra in this frequency range...Read full article

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    Published: December 2011
    Glossary
    fourier transform
    Any of the various methods of decomposing a signal into a set of coefficients of orthogonal waveforms (trigonometric functions).
    radiation
    The emission and/or propagation of energy through space or through a medium in the form of either waves or corpuscular emission.
    terahertz
    Terahertz (THz) refers to a unit of frequency in the electromagnetic spectrum, denoting waves with frequencies between 0.1 and 10 terahertz. One terahertz is equivalent to one trillion hertz, or cycles per second. The terahertz frequency range falls between the microwave and infrared regions of the electromagnetic spectrum. Key points about terahertz include: Frequency range: The terahertz range spans from approximately 0.1 terahertz (100 gigahertz) to 10 terahertz. This corresponds to...
    tomography
    Technique that defocuses activity from surrounding planes by means of the relative motions at the point of interest.
    Andreas TünnermannAnika BrahmCarsten GerthdefensedetectorsEuropeFeaturesFelix Wichmannfemtosecond lasersFourier transformFraunhofer Institute for Applied Optics and Precision EngineeringFriedrich Schiller UniversityGunther NotniIAPImagingInstitute of Applied PhysicsIOFMaryna TymoshchukradiationsensingSensors & DetectorsspectroscopyStefan Riehemannterahertzterahertz computed tomographyterahertz CTTHzTHZ CTTi:sapphire femtosecond lasertomographyx-ray computed tomographyLasers

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