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T-rays Reveal Hidden Art

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ANN ARBOR, Mich., Feb. 4, 2008 -- A device that combines lasers and electronics uses pulses of terahertz radiation -- T-rays -- to reveal depth and detail in a way x-rays cannot, and could let art historians see murals hidden beneath coats of plaster or paint in centuries-old buildings. T-rays could also illuminate penciled sketches under paintings on canvas without harming the artwork, researchers from the University of Michigan (U-M) said. Current methods of imaging underdrawings can't detect certain art materials such as graphite or sanguine, a red chalk that some of the masters are believed to have used. The...Read full article

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    Published: February 2008
    Glossary
    electronics
    That branch of science involved in the study and utilization of the motion, emissions and behaviors of currents of electrical energy flowing through gases, vacuums, semiconductors and conductors, not to be confused with electrics, which deals primarily with the conduction of large currents of electricity through metals.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    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...
    terahertz radiation
    Electromagnetic radiation with frequencies between 300 GHz and 10 THz, and existing between regions of the electromagnetic spectrum that are typically classified as the far-infrared and microwave regions. Because terahertz waves have the ability to penetrate some solid materials, they have the potential for applications in medicine and surveillance.
    antennaartartworkBianca JacksoncanvaschurchCommunicationsDaVincielectromagneticelectronicsfrescoeImagingJohn WhitakerLouvremuralNews & FeaturesOptics CommunicationspaintingsphotonicsPicometrixradiationrayssemiconductorssketchesterahertzterahertz imagingterahertz radiationU-Multrafastultrafast lasersUniversity of Michiganx-rayx-ray imagingLasers

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