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Multi-image acquisition-based distance sensor using agile laser spot beam.

Nabeel A Riza, M Junaid Amin

    Applied Optics
    |October 17, 2014
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    Summary
    This summary is machine-generated.

    This study introduces a new laser distance sensor that overcomes the Rayleigh resolution limit using spatial processing and a variable focus lens. This novel technique achieves sub-centimeter resolution for accurate distance measurements.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Laser Technology

    Background:

    • Traditional laser-based distance sensors face limitations due to the Rayleigh axial resolution limit.
    • This limit restricts the precision of measurements, especially at the minimum beam waist.
    • A novel approach is needed to surpass these inherent constraints for enhanced measurement accuracy.

    Purpose of the Study:

    • To develop a novel laser-based distance measurement technique that overcomes the Rayleigh axial resolution limit.
    • To enhance the resolution and accuracy of distance sensing using spatial processing and variable focus.
    • To demonstrate a potentially cost-effective solution for high-resolution distance measurement.

    Main Methods:

    • Utilized multiple-image-based spatial processing for distance measurements.
    • Incorporated an electronically controlled variable focus lens (ECVFL) with an optical imaging device (CCD).
    • Captured multiple laser spot images at varying focus settings to exploit the relationship between spot size and target distance.

    Main Results:

    • Achieved distance measurement resolution superior to the axial Rayleigh resolution limit.
    • Demonstrated sub-centimeter axial resolution over target ranges from 10 to 100 cm.
    • Successfully implemented a proof-of-concept sensor using a He-Ne laser, ECVFL, and CCD camera.

    Conclusions:

    • The proposed laser distance sensor effectively overcomes the Rayleigh resolution limit.
    • The technique offers a significant improvement in distance measurement resolution and accuracy.
    • Potential applications include industrial inspection, measurement, and 3D object mapping.