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In-line refractive index measurement: a simple method based on image detection.

Elisabetta Bodo, Hitesh G B Gowda, Ulrike Wallrabe

    Applied Optics
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    Summary

    We developed a simple, low-cost method to measure fluid refractive index in real-time using a camera. This technique offers accurate, wide-range measurements suitable for integrated systems.

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    Area of Science:

    • Optics and Photonics
    • Fluid Dynamics
    • Metrology

    Background:

    • Accurate refractive index measurement is crucial for fluid analysis.
    • Existing methods can be complex, costly, or unsuitable for real-time monitoring.

    Purpose of the Study:

    • To present a simple, cost-effective method for real-time refractive index determination of fluids.
    • To validate the method's accuracy and applicability for integrated measurements.

    Main Methods:

    • Imaging a collimated light beam passing through a fluid volume.
    • Measuring the beam's diameter on a CMOS sensor to calculate the refractive index.
    • Utilizing inexpensive optical components: light source, lenses, and camera.

    Main Results:

    • Experimental results align with the analytical model's predictions.
    • Achieved refractive index measurements with an RMS deviation of ±0.003 compared to a commercial refractometer.
    • Demonstrated suitability for real-time monitoring with a wide refractive index range.

    Conclusions:

    • The presented method provides a simple, accurate, and versatile approach for fluid refractive index measurement.
    • Its low cost and real-time capability make it ideal for integrated sensing applications.
    • The technique is not limited by the range of refractive indices, offering broad applicability.