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    Area of Science:

    • Terahertz (THz) technology
    • Coherence Tomography
    • Non-destructive testing

    Background:

    • Terahertz (THz) coherence tomography offers high-resolution imaging capabilities.
    • Previous methods faced limitations in speed and scanning range.

    Purpose of the Study:

    • To demonstrate a high-speed frequency-domain THz coherence tomography system.
    • To enable rapid 3D imaging of material internal structures.

    Main Methods:

    • Utilized continuous-wave THz radiation with frequency sweeping (kHz sweep rate).
    • Employed THz photomixing with a tunable optical beat source.
    • Implemented coherent homodyne detection and signal averaging for data acquisition.
    • Integrated a THz beam scanner for transverse scanning (100x100 mm²).

    Main Results:

    • Achieved THz tomographic imaging with a scan time of 100 seconds for 100x100 points.
    • Successfully visualized artificial internal defects in a glass fiber reinforced polymer sample.
    • Demonstrated high-speed data acquisition without moving the sample or THz units.

    Conclusions:

    • The developed system enables rapid, high-resolution THz coherence tomography.
    • This technique is suitable for non-destructive evaluation of materials with internal defects.