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Related Experiment Videos

Microwatt ultrasonic power determination using laser interferometry

R Reibold

    Ultrasound in Medicine & Biology
    |January 1, 1982
    PubMed
    Summary

    A new system measures radiation force using a water-immersed balance and laser interferometer, accurately determining power from microwatts to 100 mW. It achieves high consistency and low noise by minimizing environmental interference.

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    Area of Science:

    • Metrology
    • Optical Physics
    • Instrumentation

    Background:

    • Accurate radiation force measurement is crucial for various scientific and technological applications.
    • Existing methods face challenges with sensitivity, noise, and environmental interference.
    • Development of a robust system is needed for precise low-power measurements.

    Purpose of the Study:

    • To develop and validate a novel system for precise radiation force measurements.
    • To achieve high sensitivity and low noise levels across a wide power range (microwatts to 100 mW).
    • To investigate the system's performance and accuracy under controlled conditions.

    Main Methods:

    • Utilized a water-immersed balance integrated with a laser interferometer for radiation force detection.
    • Implemented compensation techniques for thermal and atmospheric pressure drifts.
    • Employed shielding against convection currents and isolation from building vibrations to minimize noise.

    Main Results:

    • The system accurately determines optical powers from approximately 3.5 microwatts to 100 milliwatts.
    • Achieved high measurement consistency and low background noise levels.
    • Sensitivity was determined to be 104 micrometer/mW (8740 interferometer steps/mW).
    • Standard deviation was less than 1% at 100 microwatts, increasing to 11% at 3.5 microwatts.

    Conclusions:

    • The developed system offers a sensitive and reliable method for radiation force measurements.
    • Environmental drift and vibration compensation are critical for achieving high-accuracy results.
    • The system demonstrates excellent performance for precise measurements, particularly at lower power levels.

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