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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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The derivative spectrometer.

D T Williams, R N Hager

    Applied Optics
    |January 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A portable second derivative spectrometer offers highly sensitive gas detection. This advanced absorption spectrometry technology enables identifying air pollutants at very low concentrations.

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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Environmental Science

    Background:

    • Conventional spectrometers have limitations in sensitivity for gas detection.
    • Absorption spectrometry is a key technique for analyzing gas composition.
    • There is a need for more sensitive and portable analytical instruments.

    Purpose of the Study:

    • To describe the theory and performance of a portable second derivative spectrometer.
    • To demonstrate enhanced gas detection sensitivities.
    • To explore applications in air pollution monitoring and biological sample analysis.

    Main Methods:

    • Development and testing of a small, portable second derivative spectrometer.
    • Utilizing absorption spectrometry principles for gas analysis.
    • Employing a 7.72-m folded light path absorption cell for enhanced sensitivity.

    Main Results:

    • The second derivative spectrometer achieves sensitivities two orders of magnitude greater than conventional spectrometers.
    • Common air pollutants are detectable at concentrations of parts per 100 million or less.
    • The instrument is capable of measuring ammonia in blood and expired air with specific absorption cell designs.

    Conclusions:

    • The portable second derivative spectrometer provides a significant advancement in gas detection sensitivity.
    • This technology offers a powerful tool for environmental monitoring of air pollutants.
    • The spectrometer's versatility allows for diverse applications, including biomedical analysis.