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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Related Experiment Video

Updated: May 12, 2026

Optical Frequency Domain Imaging of Ex vivo Pulmonary Resection Specimens: Obtaining One to One Image to Histopathology Correlation
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Time-domain full-field optical coherence tomography with a digital defocus correction.

Austėja Trečiokaitė, Karolis Adomavičius, Egidijus Auksorius

    Optics Letters
    |May 15, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Digital defocus correction in time-domain full-field optical coherence tomography (TD-FF-OCT) overcomes image degradation in scattering media. This technique compensates for up to 1 mm of defocus, enhancing imaging depth in biomedical applications.

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    Area of Science:

    • Biomedical Optics
    • Optical Imaging
    • Coherent Tomography

    Background:

    • Time-domain full-field optical coherence tomography (TD-FF-OCT) offers high-resolution deep tissue imaging.
    • Optical aberrations like sample defocus limit TD-FF-OCT's imaging depth and quality.
    • Scattering media pose significant challenges for current OCT techniques.

    Purpose of the Study:

    • To demonstrate digital correction of sample defocus in TD-FF-OCT within scattering media.
    • To investigate the effectiveness of digital defocus correction over a wide range.
    • To enhance the achievable imaging depth and image quality of TD-FF-OCT.

    Main Methods:

    • Matched optical path lengths in sample and reference arms of the interferometer.
    • Implementation of digital signal processing for defocus compensation.
    • Testing the digital correction method on both reflective and scattering samples.

    Main Results:

    • Digital defocus correction successfully compensated for sample defocus in highly scattering media.
    • The technique effectively corrected up to 1 mm of defocus.
    • Image quality degradation due to defocus was significantly mitigated.

    Conclusions:

    • Digital defocus correction is a viable method to overcome limitations in TD-FF-OCT.
    • This approach extends the practical imaging depth and improves image fidelity in scattering biological tissues.
    • The technique holds promise for advanced biomedical imaging applications.