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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Easy integrable refractometer for liquids on extended surfaces.

Manuel Trierweiler¹, Tobias Peterseim¹, Cornelius Neumann²

¹Robert Bosch GmbH, 71701 Schwieberdingen, Germany.

The Review of Scientific Instruments

|July 3, 2020

Summary

This summary is machine-generated.

This study introduces a novel refractive index (RI) monitoring device for planar surfaces, overcoming limitations of conventional refractometers. The new method offers precise RI measurements for diverse applications, enhancing fluid analysis beyond laboratory settings.

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Area of Science:

Optical Physics and Instrumentation
Materials Science
Analytical Chemistry

Background:

Conventional Abbe refractometers determine liquid refractive index (RI) via critical angle evaluation on prism surfaces.
Existing methods are confined to laboratory settings and unsuitable for monitoring fluids on extended planar surfaces.

Purpose of the Study:

To develop a versatile refractive index monitoring device applicable to plates of any geometry.
To enable in-situ fluid analysis on extended surfaces, integrating optical waveguides for measurement.

Main Methods:

A novel refractometer design utilizing the area of interest as an optical waveguide.
Testing with sucrose solutions across a refractive index range of 1.35568 to 1.43080 using a 589 nm LED source.
Implementation of a calibration protocol with standardized solutions for accurate RI determination.

Main Results:

The developed device successfully measured refractive indices for sucrose solutions.
Achieved an average uncertainty of 1.6 × 10^-3 for refractive index determination.
Demonstrated a maximum deviation of 0.13% compared to a state-of-the-art refractometer.

Conclusions:

The proposed refractive index monitoring device is effective for planar surfaces of arbitrary geometry.
The method offers a practical solution for integrating RI monitoring into various applications.
This technology expands the scope of fluid analysis beyond traditional laboratory environments.