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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Single-beam diode-laser technique for optical path-length measurements.

C B Carlisle, R E Warren, H Riris

    Applied Optics
    |November 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new radio-frequency modulated diode laser technique accurately measures optical path lengths. This method enhances optical range-finding and multipass cell measurements with high signal-to-noise ratios.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Metrology

    Background:

    • Optical path length measurement is crucial in various scientific and engineering applications.
    • Traditional optical range-finding methods often face limitations in resolution and signal-to-noise ratio.
    • Multipass cells require precise optical path length determination for optimal performance.

    Purpose of the Study:

    • To demonstrate a simple single-beam technique for measuring optical path lengths.
    • To present a novel approach for optical range-finding over short distances.
    • To evaluate the technique's performance compared to existing methods.

    Main Methods:

    • Utilized a tunable diode laser with radio-frequency (RF) modulation.
    • Employed homodyne demodulation for signal processing.
    • Implemented a single-beam configuration for measurement.

    Main Results:

    • Successfully measured optical path lengths using the RF modulation technique.
    • Achieved high signal-to-noise ratios and narrow-band detection capabilities.
    • Demonstrated effective optical range-finding with resolutions better than 1 meter.

    Conclusions:

    • The demonstrated RF-modulated laser technique provides a straightforward and effective means for measuring optical path lengths.
    • This method offers advantages in signal-to-noise ratio and range resolution compared to traditional short-pulse, wide-bandwidth range finders.
    • The technique is suitable for applications involving optical multipass cells and short-distance optical range-finding.