University of Oulu

J. Jansson, S. Jahromi, K. Haapalainen, H. Juttula, A. Mäkynen and J. Nissinen, "An integrated 9x9 SPAD array with a 10-channel TDC and a CMOS laser diode driver for a wearable time-domain diffuse optics optode," 2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Dubrovnik, Croatia, 2020, pp. 1-5, doi: 10.1109/I2MTC43012.2020.9129341

An integrated 9x9 SPAD array with a 10-channel TDC and a CMOS laser diode driver for a wearable time-domain diffuse optics optode

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Author: Jansson, Jussi-Pekka1; Jahromi, Sahba1; Haapalainen, Kalle1;
Organizations: 1Circuits and Systems Research Unit, University of Oulu, Oulu, Finland
2Optoelectronics and Measurement Techniques Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2020100577994
Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2020-10-05
Description:

Abstract

A 9x9 Single-Photon Avalanche Photodiode (SPAD) array with a 10-channel time-to-digital converter and an integrated laser diode driver fabricated in 0.35 μm HV- CMOS technology were used to carry out time domain diffuse optics measurements of optical phantoms. The average optical power of 20 μW was achieved by the laser diode transmitter at the repetition rate of 500 kHz with a pulse width of 80 ps. The resolution of the TDC and the measured instrument response function (IRF) of the system were ~65 ps and ~190 ps, respectively. The power consumption of the proposed system was 180 mW. Measurements showed that with the proposed system a perturbation with a different absorption property than in surrounding material at the depth of 15 mm could be recognized. In addition, in in vivo measurement with the proposed components, hemodynamic changes in volunteer’s arm during a venous occlusion were detected.

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Series: IEEE International Instrumentation and Measurement Technology Conference
ISSN: 2642-2069
ISSN-E: 2642-2077
ISSN-L: 2642-2069
ISBN: 978-1-7281-4460-3
ISBN Print: 978-1-7281-4461-0
Pages: 1 - 5
Article number: 9129341
DOI: 10.1109/I2MTC43012.2020.9129341
OADOI: https://oadoi.org/10.1109/I2MTC43012.2020.9129341
Host publication: 2020 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2020
Conference: IEEE International Instrumentation and Measurement Technology Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: This work was supported by the Academy of Finland under contracts 314404 and 323719 and (Centre of Excellence in Laser Scanning Research) under Contract 307362.
Academy of Finland Grant Number: 314404
323719
307362
Detailed Information: 314404 (Academy of Finland Funding decision)
323719 (Academy of Finland Funding decision)
307362 (Academy of Finland Funding decision)
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