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Subjective Refraction Test Using a Smartphone for Vision Screening
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Smartphone-Based Refractive Index Optosensing Platform Using a DVD Grating.

Carlos Angulo Barrios1

  • 1Department of Photonics and Bioengineering, CEMDATIC, ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.

Sensors (Basel, Switzerland)
|February 15, 2022
PubMed
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This study presents a low-cost smartphone refractometer using a DVD diffraction grating. This optical sensing platform offers a simple, accessible method for refractive index measurement in various applications.

Area of Science:

  • Optoelectronics
  • Sensor Technology
  • Biomedical Optics

Background:

  • Refractometry is crucial for analyzing liquid properties.
  • Existing refractometers can be expensive and complex.
  • There is a need for portable, low-cost refractive index sensing solutions.

Purpose of the Study:

  • To demonstrate a low-cost, smartphone-based optical diffraction grating refractometer.
  • To leverage readily available smartphone components for sensing.
  • To assess the performance of the proposed refractometer for biosensing applications.

Main Methods:

  • Utilized a DVD as a diffraction grating.
  • Employed a smartphone's LED flashlight as a light source and camera as a detector.
  • Analyzed the diffraction pattern of the DVD grating to determine refractive index.
Keywords:
diffraction gratingoptical sensorpoint-of-needrefractive indexsmartphone

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  • No additional optical components were required.

    • Main Results:

    • Achieved a linear response in the refractive index range of 1.333-1.358 refractive index units (RIU).
    • Demonstrated a sensitivity of 32.4 RIU-1 and a resolution of 2 × 10-3 RIU for water.
    • Validated the smartphone refractometer's capability for accurate refractive index measurements.

    Conclusions:

    • The smartphone-based refractometer is a cost-effective and accessible optosensing platform.
    • The device shows potential for affinity-based biosensing and point-of-need applications.
    • This technology offers a promising alternative for portable refractive index monitoring.