Multipoint Raman Spectrometer Based on a Time-Resolved CMOS SPAD Sensor

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...

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Bibliographic Details
Published in:IEEE photonics technology letters 2023-06, Vol.35 (11), p.1-1
Main Authors: Talala, Tuomo, Kaikkonen, Ville A., Virta, Eetu, Makynen, Anssi J., Nissinen, Ilkka
Format: Article
Language:English
Subjects:
Avalanche diodes
CMOS
Ethanol
Fluorescence
Fluorescence lifetime
Measurement methods
Monitoring
Optical communication
Optical fiber cables
Optical fiber couplers
Optical fiber dispersion
Optical fiber sensors
Photon avalanches
Photonics
Raman spectra
Raman spectroscopy
single-photon avalanche diode (SPAD) time-correlated single photon counting (TCSPC)
Single-photon avalanche diodes
Spectrometers
Time measurement
time-resolved spectroscopy
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2023.3268333