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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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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Quasimonochromatic white light fringe interferometer.

B K Ward, K Seta

    Applied Optics
    |June 29, 2010
    PubMed
    Summary

    Researchers evaluated quasimonochromatic light sources for precise measurements using a Michelson interferometer. A resolution of 2-3 micrometers was achieved, proving suitable for calibrating survey baselines.

    Area of Science:

    • Optics and Photonics
    • Metrology

    Background:

    • Accurate determination of zero path difference is crucial for interferometric measurements.
    • Quasimonochromatic light sources offer potential for enhanced fringe visibility and resolution.

    Purpose of the Study:

    • To assess the suitability of laser diodes and high-power LEDs for zero path difference determination.
    • To compare theoretical fringe visibility with experimental results in a Michelson interferometer.

    Main Methods:

    • Theoretical determination of fringe visibility curves for various light sources.
    • Experimental validation using a Michelson interferometer with a 25-m path length.
    • Analysis of fringe visibility and achieved resolution.

    Main Results:

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    • A resolution of 2-3 micrometers was achieved using multimode laser diodes and a laser diode operated as an LED.
    • Experimental results align with theoretical predictions for fringe visibility.
    • The achieved resolution is sufficient for survey baseline calibration.

    Conclusions:

    • Multimode laser diodes and laser diodes operated as LEDs are suitable for zero path difference determination.
    • The study demonstrates a practical method for high-resolution interferometric measurements.
    • The findings support the use of these light sources for precise metrology applications.