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Self-aligning CMOS photodetector sensor for application on an NDB-based optical encoder.

Nicolás Calarco, Lucas Mombello, José Lipovetzky

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    This summary is machine-generated.

    A new complementary metal-oxide-semiconductor (CMOS) photodetector simplifies alignment for non-diffracting-beam (NDB) optical encoders. Its reconfigurable hexagonal array finds the NDB center, optimizing system setup.

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    Area of Science:

    • Optoelectronics
    • Integrated Circuits
    • Optical Metrology

    Background:

    • Non-diffracting beams (NDBs) offer unique properties for optical sensing.
    • Accurate alignment of NDB-based optical encoder heads is crucial for performance.
    • Existing photodetector designs can present alignment challenges.

    Purpose of the Study:

    • To introduce a novel CMOS photodetector for NDB optical encoders.
    • To address and simplify the critical alignment process in NDB systems.
    • To enhance the usability and efficiency of NDB optical encoders.

    Main Methods:

    • Design of a CMOS photodetector featuring a hexagonal array of photodiodes.
    • Integration of static random access memory (SRAM) cells for configurable interconnections.
    • Implementation of a search algorithm to locate the NDB center on the photodiode array.

    Main Results:

    • The photodetector allows dynamic reconfiguration of photodiode connections.
    • A search algorithm successfully identifies the photodiode impacted by the NDB center.
    • The proposed sensor design significantly simplifies system alignment procedures.

    Conclusions:

    • The developed CMOS photodetector effectively simplifies the alignment of NDB optical encoders.
    • Reconfigurable photodiode arrays offer a promising solution for optical alignment challenges.
    • This innovation enhances the practical application of NDB technology in encoders.