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IR Spectrometers01:25

IR Spectrometers

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: Jun 10, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

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Published on: October 11, 2016

Two-wavelength double heterodyne interferometry using a matched grating technique.

Z Sodnik, E Fischer, T Ittner

    Applied Optics
    |August 14, 2010
    PubMed
    Summary

    This study applies two-wavelength double heterodyne interferometry for precise topographic measurements on rough surfaces. The technique enhances system stability and simplifies frequency generation using a specialized laser and grating.

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    Last Updated: Jun 10, 2026

    Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Surface Science

    Background:

    • Topographic measurements of optically rough surfaces present challenges in precision and stability.
    • Traditional interferometry methods can be limited by surface roughness and environmental factors.

    Purpose of the Study:

    • To investigate the application of two-wavelength double heterodyne interferometry for enhanced topographic measurements.
    • To improve system stability and simplify heterodyne frequency generation in interferometric setups.

    Main Methods:

    • Utilized a two-wavelength Helium-Neon (He-Ne) laser source.
    • Employed a matched grating technique for heterodyne frequency generation.
    • Applied two-wavelength double heterodyne interferometry for surface profiling.

    Main Results:

    • Demonstrated successful topographic measurements on optically rough target surfaces.
    • Achieved improved system stability through the use of a two-wavelength laser.
    • Simplified the process of heterodyne frequency generation.

    Conclusions:

    • Two-wavelength double heterodyne interferometry is a viable technique for accurate topographic measurements on rough surfaces.
    • The integration of a two-wavelength He-Ne laser and matched grating technique enhances the performance and usability of the system.