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Related Concept Videos

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Related Experiment Video

Updated: Jun 24, 2025

Implementation of a Coherent Anti-Stokes Raman Scattering CARS System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope
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Multi-laser source interference suppression using the time-coding method for SPAD-based flash DToF systems.

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    This summary is machine-generated.

    This study introduces time coding to reduce interference in direct time-of-flight (DToF) imaging systems. This method significantly improves measurement accuracy by suppressing noise from multiple DToF sources.

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    Area of Science:

    • Optoelectronics
    • Image Sensing Technology
    • Semiconductor Devices

    Background:

    • Flash-type direct time-of-flight (DToF) image sensors rely on in-pixel successive approximation register time-to-digital converters (SAR TDC) for precise time quantization.
    • Simultaneous operation of multiple DToF systems leads to mutual signal interference, compromising measurement accuracy due to overlapping laser signals.

    Purpose of the Study:

    • To develop and validate a novel 'time coding' method for mitigating interference in multi-DToF system environments.
    • To enhance the robustness and reliability of DToF imaging systems operating in cluttered optical conditions.

    Main Methods:

    • Implementation of a time-coding technique involving the insertion of delay time bins between system working periods.
    • Design and simulation of the time-coding method using 110 nm complementary metal-oxide-semiconductor (CMOS) technology.
    • Verification through behavioral modeling and circuit simulations to assess interference suppression and accuracy.

    Main Results:

    • The time-coding method effectively suppresses interference noise by at least 95% in DToF systems.
    • Measurement accuracy is maintained at 99% or higher, even at extended distances, with the implemented time coding patterns.
    • The proposed method demonstrates significant noise reduction compared to traditional DToF systems.

    Conclusions:

    • Time coding offers a viable solution to the critical challenge of mutual interference in multi-DToF systems.
    • The developed 110 nm CMOS-based time-coding technique ensures high measurement accuracy and noise suppression.
    • This advancement is crucial for the reliable deployment of DToF imaging in complex, multi-sensor scenarios.