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Related Concept Videos

IR Spectrometers01:25

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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Related Experiment Video

Updated: Mar 19, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Reflective-focused laser differential interferometer.

J Luke Hill, Ahsan Hameed, Matthew P Borg

    Applied Optics
    |March 17, 2026
    PubMed
    Summary

    A new reflective focused laser differential interferometer (R-FLDI) offers greater versatility for measurements. This innovative design maintains performance while enabling broader applications with fewer optical access points.

    Area of Science:

    • Optical metrology
    • Fluid dynamics instrumentation

    Background:

    • Focused laser differential interferometers (FLDI) are valuable tools for precise measurements.
    • Traditional FLDI setups can be limited by optical access requirements.

    Purpose of the Study:

    • To introduce and evaluate a novel reflective FLDI (R-FLDI) instrument.
    • To demonstrate the enhanced versatility of R-FLDI compared to traditional FLDI.

    Main Methods:

    • Designed and constructed benchtop configurations of both traditional FLDI and R-FLDI.
    • Used instruments to probe the exit of a translated sonic jet along the beam axis.

    Main Results:

    • The R-FLDI instrument demonstrated comparable performance to traditional FLDI.

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  • R-FLDI provided enhanced versatility due to its reflective surface design.
  • Measurements were successfully taken with only one optical access point.

    • Conclusions:

    • The R-FLDI represents a significant advancement in interferometer design.
    • The instrument's versatility makes it suitable for a wider range of measurement scenarios.
    • R-FLDI maintains high performance while simplifying experimental setups.