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Passive ranging using a filter-based non-imaging method based on oxygen absorption.

Hao Yu, Bingqi Liu, Zongqun Yan

    Applied Optics
    |October 20, 2017
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    Summary
    This summary is machine-generated.

    A new filter-based method simplifies passive ranging technology using oxygen absorption. This approach achieves 6.5% accuracy at 400m, improving real-time measurements for optical sensing applications.

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    Area of Science:

    • Optical Engineering
    • Atmospheric Remote Sensing
    • Spectroscopy

    Background:

    • Hyperspectral imaging systems face limitations in real-time measurement accuracy.
    • Passive ranging technology requires simplified, robust designs for practical application.

    Purpose of the Study:

    • To propose a filter-based, non-imaging ranging method for passive ranging systems.
    • To enhance real-time measurement capabilities and simplify system design.
    • To utilize the oxygen absorption spectrum for accurate distance estimation.

    Main Methods:

    • Employed three bandpass filters to capture radiation intensities around the 762 nm oxygen absorption band and its shoulders.
    • Utilized a photomultiplier tube as the non-imaging sensor.
    • Estimated range by comparing calculated oxygen absorption transmission (τO) with a predicted τO-range curve.

    Main Results:

    • Successfully demonstrated a filter-based non-imaging ranging method.
    • Achieved an accuracy of 6.5% for the experimental ranging system.
    • Validated the method under short-range conditions up to 400 meters.

    Conclusions:

    • The proposed filter-based method offers a viable solution for passive ranging.
    • This technique improves real-time measurement accuracy and simplifies system design.
    • The oxygen absorption spectrum provides a reliable basis for passive distance determination.