Multipoint Raman spectrometer based on a time-resolved CMOS SPAD sensor
Talala, Tuomo; Kaikkonen, Ville A.; Virta, Eetu; Mäkynen, Anssi J.; Nissinen, Ilkka (2023-04-19)
Talala, T., Kaikkonen, V. A., Virta, E., Mäkynen, A. J., & Nissinen, I. (2023). Multipoint Raman Spectrometer Based on a Time-Resolved CMOS SPAD Sensor. In IEEE Photonics Technology Letters (Vol. 35, Issue 11, pp. 629–632). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/lpt.2023.3268333
© 2023 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/.
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https://urn.fi/URN:NBN:fi-fe20230929137860
Tiivistelmä
Abstract
The potential of in-line Raman spectrometers for process monitoring applications has been shown for many industrial processes, but in most cases, only one measurement point has been monitored by one spectrometer. In this letter, we describe and demonstrate a novel, time-resolved method for measuring Raman spectra and fluorescence lifetimes from multiple points using a single excitation source and a single spectrometer. This technique is based on a combination of a time-resolved CMOS SPAD (single-photon avalanche diode) line sensor and a fitting optical light guiding system. The line sensor is designed to make multiple individual measurements at intervals of tens of nanoseconds and the optical light guiding system, in turn, produces matching temporal differences for optical signals from different measurement points. Thereby, signals from different points are distinguished in the time domain. A combined Raman and fluorescence lifetime monitoring of two measurement points was demonstrated with an oil-ethanol emulsion sample.
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