Solution refractive index sensor based on high resolution total-internal-reflection heterodyne interferometry

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Abstract

In this paper, a solution refractive index sensor is proposed based on a high resolution total-internal-reflection (TIR) interferometry. In the proposed sensor, a half-wave plate and a quarter-wave plate that exhibit specific optic-axis azimuths are combined to form a phase shifter. When an isosceles right-angle prism whose base contacts with a tested solution is placed between the phase shifter and an analyzer with suitable transmission-axis azimuth, it shifts and increases the phase difference of the s- and p-polarization states at one TIR. The increased phase difference relates to the solution refractive index; thus it can be easily and accurately measured by evaluating the phase difference. The feasibility was demonstrated by experimental results. This method has the merits of both common-path interferometry and heterodyne interferometry.

Original languageEnglish
Pages (from-to)190-196
Number of pages7
JournalSensors and Actuators, A: Physical
Volume241
DOIs
Publication statusPublished - 2016 Apr 15

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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Instrumentation

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