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    This study introduces an optical encoding method to differentiate signals from multiple portable sensor heads (PSHs) for enhanced chemical detection. This innovation improves the sensitivity and range of spectral sensors used in high-security applications.

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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Sensor Technology

    Background:

    • Spectral emission/absorption sensors are vital for detecting restricted materials in high-security areas.
    • Portable units face limitations in monitoring a broad spectral range with high resolution.
    • Optical fibers can transmit signals from portable sensor heads (PSHs) to a central analyzer.

    Purpose of the Study:

    • To develop a method for differentiating simultaneous spectral detections from multiple PSHs.
    • To enable highly sensitive chemical measurements using a portable spectral sensing unit.
    • To enhance the capabilities of spectral sensors for broader chemical monitoring.

    Main Methods:

    • An optical encoding method was developed for signal differentiation.
    • The methodology was demonstrated using a simulation in MATLAB Simulink.
    • The approach focuses on improving the identification of individual PSHs in a multi-sensor setup.

    Main Results:

    • The proposed optical encoding method allows for the differentiation of signals from multiple PSHs.
    • This technique facilitates highly sensitive measurements in a portable unit.
    • Simulation results validated the effectiveness of the proposed methodology.

    Conclusions:

    • The optical encoding method is a viable solution for differentiating signals from multiple PSHs in portable spectral sensing systems.
    • This approach enhances the sensitivity and applicability of spectral sensors for detecting a wider range of chemicals.
    • The developed methodology holds promise for improving security screening in areas like airports.