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Review
. 2021 Jan 21;27(5):1514-1532.
doi: 10.1002/chem.202002838. Epub 2020 Oct 29.

Principles and Applications of Miniaturized Near-Infrared (NIR) Spectrometers

Krzysztof B Beć  1 , Justyna Grabska  1 , Christian W Huck  1
Affiliations
Review

Principles and Applications of Miniaturized Near-Infrared (NIR) Spectrometers

Krzysztof B Beć et al. Chemistry. .

Abstract

This review article focuses on the principles and applications of miniaturized near-infrared (NIR) spectrometers. This technology and its applicability has advanced considerably over the last few years and revolutionized several fields of application. What is particularly remarkable is that the applications have a distinctly diverse nature, ranging from agriculture and the food sector, through to materials science, industry and environmental studies. Unlike a rather uniform design of a mature benchtop FTNIR spectrometer, miniaturized instruments employ diverse technological solutions, which have an impact on their operational characteristics. Continuous progress leads to new instruments appearing on the market. The current focus in analytical NIR spectroscopy is on the evaluation of the devices and associated methods, and to systematic characterization of their performance profiles.

Keywords: IR spectroscopy; analytical methods; handheld devices; miniaturized spectrometers; near-infrared spectroscopy.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Selected popular miniaturized NIR spectrometers: a) MicroPHAZIR (Thermo Fisher Scientific); b) DLP NIRscan Nano evaluation module (EVM; Texas Instruments); c) NeoSpectra (Si‐Ware Systems); d) nanoFTIR NIR (SouthNest Technology); e) NIRONE Sensor S (Spectral Engines); and f) MicroNIR Pro ES 1700 (VIAVI).
Figure 2
Figure 2
NIR spectra of the pure ingredients of the pharmaceutical formulation investigated by Yan and Siesler [58] recorded with the miniaturized spectrometers: a) NeoSpectra, b) NIRONE, c) DLP NIRScan, and d) MicroNIR. Reproduced with permission from ref. [58]. Copyright Elsevier, 2018.
Figure 3
Figure 3
NIR spectra of 60 R. folium samples. Reproduced with permission from ref. [63]. Copyright Royal Chemical Society, 2017.
Figure 4
Figure 4
Raw spectra of 12 pure solvents measured on the master (benchtop) and target (miniaturized MicroNIR) instrument. Adopted with permission from ref. [121]. Copyright Elsevier, 2017.
See this image and copyright information in PMC

References

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    1. Crocombe R., Appl. Spectrosc. 2018, 72, 1701–1751. - PubMed
    1. Beć K. B., Grabska J., Siesler H. W., Huck C. W., NIR News 2020, 31, 28–35.
    1. Pasquini C., Analytica Chimica Acta 2018, 1026, 8–36. - PubMed

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