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Article

Spectral-Coding-Based Compressive Single-Pixel NIR Spectroscopy in the Sub-Millisecond Regime

RECENDT—Research Center for Non-Destructive Testing GmbH, Science Park 2, Altenberger Str. 69, 4040 Linz, Austria
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Academic Editor: Yuji Matsuura
Sensors 2021, 21(16), 5563; https://doi.org/10.3390/s21165563
Received: 30 July 2021 / Revised: 13 August 2021 / Accepted: 14 August 2021 / Published: 18 August 2021
(This article belongs to the Special Issue Infrared Sensors and Technologies: Recent Advances)
In this contribution, we present a high-speed, multiplex, grating spectrometer based on a spectral coding approach that is founded on principles of compressive sensing. The spectrometer employs a single-pixel InGaAs detector to measure the signals encoded by an amplitude spatial light modulator (digital micromirror device, DMD). This approach leads to a speed advantage and multiplex sensitivity advantage atypical for standard dispersive systems. Exploiting the 18.2 kHz pattern rate of the DMD, we demonstrated 4.2 ms acquisition times for full spectra with a bandwidth of 450 nm (5250–4300 cm−1; 1.9–2.33 µm). Due to the programmability of the DMD, spectral regions of interest can be chosen freely, thus reducing acquisition times further, down to the sub-millisecond regime. The adjustable resolving power of the system accessed by means of computer simulations is discussed, quantified for different measurement modes, and verified by comparison with a state-of-the-art Fourier-transform infrared spectrometer. We show measurements of characteristic polymer absorption bands in different operation regimes of the spectrometer. The theoretical multiplex advantage of 8 was experimentally verified by comparison of the noise behavior of the spectral coding approach and a standard line-scan approach. View Full-Text
Keywords: single-pixel; spectroscopy; near-infrared; DMD; multiplexing; spectral coding; sub-millisecond; compressive measurement single-pixel; spectroscopy; near-infrared; DMD; multiplexing; spectral coding; sub-millisecond; compressive measurement
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MDPI and ACS Style

Gattinger, P.; Zorin, I.; Rankl, C.; Brandstetter, M. Spectral-Coding-Based Compressive Single-Pixel NIR Spectroscopy in the Sub-Millisecond Regime. Sensors 2021, 21, 5563. https://doi.org/10.3390/s21165563

AMA Style

Gattinger P, Zorin I, Rankl C, Brandstetter M. Spectral-Coding-Based Compressive Single-Pixel NIR Spectroscopy in the Sub-Millisecond Regime. Sensors. 2021; 21(16):5563. https://doi.org/10.3390/s21165563

Chicago/Turabian Style

Gattinger, Paul, Ivan Zorin, Christian Rankl, and Markus Brandstetter. 2021. "Spectral-Coding-Based Compressive Single-Pixel NIR Spectroscopy in the Sub-Millisecond Regime" Sensors 21, no. 16: 5563. https://doi.org/10.3390/s21165563

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