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We developed a simple gradient shadow pattern (GSP) method to measure liquid refractive index (nL). This technique offers a robust and cost-effective approach for portable applications, accurately determining nL across a wide range of liquids.

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Area of Science:

  • Optics
  • Materials Science
  • Analytical Chemistry

Background:

  • Accurate measurement of liquid refractive index (nL) is crucial for various scientific and industrial applications.
  • Existing methods for nL determination can be complex, expensive, or require specialized equipment.
  • A need exists for simple, robust, and cost-effective techniques for nL measurement.

Purpose of the Study:

  • To introduce a novel and straightforward method for measuring the refractive index of liquids.
  • To establish the principle behind the gradient shadow pattern (GSP) technique for nL determination.
  • To demonstrate the method's applicability across a broad spectrum of liquid samples.

Main Methods:

  • A gradient shadow pattern (GSP) is generated by projecting light through a liquid-filled chamber.
  • The GSP exhibits a "dark-bright-dark" profile.
  • A linear relationship between the liquid's refractive index (nL) and the proportion of the bright region in the GSP is utilized.

Main Results:

  • A linear correlation was identified between nL and the bright region proportion of the GSP.
  • The method successfully measured nL for liquids in the range of 1.33 to 1.46 with an error below 0.01.
  • The measurement setup is single and does not require expensive or precise optical components.

Conclusions:

  • The proposed GSP method provides a simple, robust, and cost-effective way to measure liquid refractive index.
  • The technique is resilient to variations in illumination conditions.
  • This method is suitable for portable measurement systems requiring nL determination for liquid attribute analysis.