Towards time-domain diffuse optics with extreme photon rate
Di Sieno, L.; Talala, T.; Avanzi, E.; Nissinen, I.; Nissinen, J.; Dalla Mora, A. (2023-08-09)
SPIE
09.08.2023
L. Di Sieno, T. Talala, E. Avanzi, I. Nissinen, J. Nissinen, and A. Dalla Mora "Towards time-domain diffuse optics with extreme photon rate", Proc. SPIE 12628, Diffuse Optical Spectroscopy and Imaging IX, 1262815 (9 August 2023); https://doi.org/10.1117/12.2669264
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Copyright 2023 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
https://rightsstatements.org/vocab/InC/1.0/
Copyright 2023 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
https://rightsstatements.org/vocab/InC/1.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202405304102
https://urn.fi/URN:NBN:fi:oulu-202405304102
Tiivistelmä
Abstract
We present the application to time-domain diffuse optics of a device composed of 8x256 CMOS SPAD array with 256 7-bit time-to-digital converters. Thanks to its structure and despite the limitation on the maximum repetition rate of the laser (2 MHz), it has been demonstrated to be suitable for fast acquisitions (10 ms) provided that a high photon count-rate is used and pile-up distortion is corrected. We demonstrate that high penetration depth (>30 mm) and good linearity in absorption coefficient retrieval can be achieved. Finally, we were able to clearly record the heart beat in a resting state forehead measurement.
We present the application to time-domain diffuse optics of a device composed of 8x256 CMOS SPAD array with 256 7-bit time-to-digital converters. Thanks to its structure and despite the limitation on the maximum repetition rate of the laser (2 MHz), it has been demonstrated to be suitable for fast acquisitions (10 ms) provided that a high photon count-rate is used and pile-up distortion is corrected. We demonstrate that high penetration depth (>30 mm) and good linearity in absorption coefficient retrieval can be achieved. Finally, we were able to clearly record the heart beat in a resting state forehead measurement.
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