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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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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Spectral-Coding-Based Compressive Single-Pixel NIR Spectroscopy in the Sub-Millisecond Regime.

Paul Gattinger1, Ivan Zorin1, Christian Rankl1

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PubMed
Summary
This summary is machine-generated.

We developed a fast grating spectrometer using spectral coding and a digital micromirror device (DMD). This high-speed spectrometer achieves rapid full spectrum acquisition and offers adjustable resolution, outperforming traditional systems.

Keywords:
DMDcompressive measurementmultiplexingnear-infraredsingle-pixelspectral codingspectroscopysub-millisecond

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Materials Science

Background:

  • Standard dispersive spectrometers face limitations in speed and multiplex sensitivity.
  • Compressive sensing principles offer potential for novel spectroscopic approaches.

Purpose of the Study:

  • To present a high-speed, multiplex grating spectrometer utilizing spectral coding.
  • To leverage a digital micromirror device (DMD) for enhanced spectroscopic performance.

Main Methods:

  • Employed a spectral coding approach based on compressive sensing principles.
  • Utilized a single-pixel InGaAs detector coupled with a DMD for signal encoding.
  • Demonstrated rapid spectral acquisition by exploiting the DMD's high pattern rate.

Main Results:

  • Achieved 4.2 ms acquisition times for full spectra over a 450 nm bandwidth.
  • Demonstrated sub-millisecond acquisition times for selected spectral regions.
  • Experimentally verified a theoretical multiplex advantage of 8 compared to line-scan methods.
  • Validated adjustable resolving power against a Fourier-transform infrared spectrometer.

Conclusions:

  • The spectral coding spectrometer offers significant speed and multiplex advantages over conventional systems.
  • The DMD-based approach enables flexible spectral region selection and rapid data acquisition.
  • This technology has potential applications in polymer analysis and other fields requiring fast spectroscopic measurements.