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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

1.5K
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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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Related Experiment Video

Updated: Sep 25, 2025

Implementation of a Reference Interferometer for Nanodetection
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Miniature Fourier transform spectrometer based on a fiber-tip interferometer.

Chunyang Han, Hui Ding, Baojin Li

    Optics Express
    |April 27, 2022
    PubMed
    Summary

    We developed a cost-effective, miniature Fourier transform (FT) spectrometer using a fiber-tip Fizeau interferometer. This portable spectral analysis device offers performance comparable to commercial spectrometers.

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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Instrumentation

    Background:

    • Miniaturization of spectrometers is crucial for portable and in situ spectral analysis across various fields.
    • Existing miniature spectrometers face challenges including high cost, complex configurations, and susceptibility to external disturbances, limiting practical applications.
    • Fourier transform (FT) spectroscopy offers high resolution but often requires bulky and expensive instrumentation.

    Purpose of the Study:

    • To report a novel miniature Fourier transform (FT) spectrometer design.
    • To demonstrate a cost-effective and user-friendly approach for portable spectral analysis.
    • To achieve performance comparable to commercial benchtop spectrometers in a compact form factor.

    Main Methods:

    • A fiber-tip Fizeau interferometer was designed for the miniature FT spectrometer.
    • Optical path difference (OPD) scanning was achieved through manual force application.
    • Two photodetectors monitored interferograms over time, enabling accurate OPD and intensity measurements for spectrum retrieval.

    Main Results:

    • The developed miniature spectrometer achieved a resolution of 7.69 cm⁻¹ within the 1400 nm to 1700 nm wavelength range.
    • Experimental results demonstrated performance comparable to commercial benchtop spectrometers.
    • The device proved to be cost-effective, easy to use, and independent of complex fabrication.

    Conclusions:

    • The proposed fiber-tip Fizeau interferometer design enables the creation of simple, cheap, and practical miniature spectrometers.
    • This approach overcomes the limitations of current portable spectral analysis devices.
    • The design offers a new concept for developing accessible spectroscopic instrumentation for diverse applications.