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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

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Measuring the dispersive properties of liquids using a microinterferometer.

Alvaro Casas Bedoya¹, Christelle Monat, Peter Domachuk

¹Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), School of Physics, University of Sydney, Sydney, New South Wales, Australia. a.casas@physics.usyd.edu.au

|June 2, 2011

Summary

A compact interferometer accurately measures liquid refractive indices in the near-infrared (NIR) spectrum. This novel refractometer uses minimal liquid and is unaffected by humidity, ideal for hygroscopic substances.

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Last Updated: Jun 1, 2026

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Area of Science:

Optical Physics
Materials Science
Analytical Chemistry

Background:

Accurate measurement of liquid optical properties is crucial for various scientific and industrial applications.
Traditional refractometry methods can be limited by sample volume, environmental sensitivity, and operational complexity.
Near-infrared (NIR) spectroscopy offers unique insights into molecular interactions and composition.

Purpose of the Study:

To develop and validate a highly compact interferometer for precise refractive index measurements of liquids in the NIR region.
To assess the suitability of the device for analyzing a wide range of liquids, including those with high refractive indices and hygroscopic properties.
To evaluate the influence of hygroscopic behavior on the optical properties of liquids in the NIR spectrum.

Main Methods:

Utilized a single-beam, compact interferometer incorporating a silica capillary (50 μm inner diameter) for liquid sample containment.
Employed broadband operation and inherent mechanical stability for robust measurements.
Implemented straightforward data acquisition protocols for efficient analysis.
Validated accuracy (±0.1%) by measuring the refractive indices of air and pure water.

Main Results:

The compact interferometer successfully measured the refractive index of liquids in the near-infrared spectrum.
The device demonstrated high accuracy (±0.1%) and required minimal sample volume.
Measurements were unaffected by atmospheric humidity due to the sealed capillary design.
Hygroscopic behavior of tested liquids showed minimal impact on their NIR optical properties.

Conclusions:

The developed compact interferometer is a versatile and accurate tool for near-infrared refractometry.
Its design overcomes limitations of traditional methods, enabling analysis of challenging liquid samples.
The findings suggest that hygroscopic effects are negligible for optical property measurements in the NIR for the studied liquids.