Working Paper Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 30 July 2021 / Approved: 31 July 2021 / Online: 31 July 2021 (15:10:23 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Sensors 2021, 21, 5563
DOI: 10.3390/s21165563

Abstract

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 demonstrate 4.2 ms acquisition times for full spectra with a bandwidth of 450 nm (5250 cm-1 – 4300 cm-1; 1.9 µm – 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.

Keywords

Single-pixel; spectroscopy; near-infrared; DMD; multiplexing; spectral coding; sub-millisecond; compressive measurement

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.