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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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Simulation of path delay multiplexing-based Fourier transform spectrometer for fiber Bragg grating interrogation.

Pandian Chelliah, Trilochan Sahoo, Sheela Singh

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    This study enhances Fourier transform spectrometers (FTS) for fiber Bragg gratings (FBG) by using path delay multiplexing. This modification significantly improves wavelength resolution and interrogation speed, crucial for FBG sensing applications.

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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Fiber Optic Sensors

    Background:

    • Fourier transform spectrometers (FTS) are utilized for interrogating fiber Bragg gratings (FBGs).
    • Standard FTS offer broad wavelength range and multiplexing but suffer from poor resolution and speed.

    Purpose of the Study:

    • To propose and simulate a modified FTS design for enhanced FBG interrogation.
    • To improve wavelength resolution and reduce interrogation time in FTS systems.

    Main Methods:

    • Implementation of path delay multiplexing within the FTS architecture.
    • Simulation of the modified FTS for different numbers of path delays (n=2, 5).

    Main Results:

    • Path delay multiplexing demonstrates potential to improve spatial resolution and interrogation time by a factor of 'n'.
    • Simulation results for n=2 and n=5 confirm the theoretical improvements.

    Conclusions:

    • Path delay multiplexing is an effective method to enhance FTS performance for FBG interrogation.
    • The proposed modification offers a viable solution for achieving higher resolution and faster interrogation speeds in FBG sensing systems.