Portable instrument for in-vivo infrared oxymetry using spread-spectrum modulation

Stefano Trevisan, Matteo Bavera, Mario Ettore Giardini

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
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Near Infrared Spectroscopy (NIRS) can be employed to monitor noninvasively and continuously local changes in hemodynamics and oxygenation of human tissues. A portable NIRS research-grade acquisition system, dedicated to measurements during muscular exercise, is presented. The instrument is able to control up to eight LED sources and two detectors. A digital correlation technique, implemented on a single-chip RISC microcontroller, performs source-to-detector multiplexing. Such algorithm is highly optimized for computational efficiency and ambient noise rejection. Software-configurable input stages allow for flexibility in instrument setup. As a result of the specific correlation technique employed, the instrument is compact, lightweight and efficient. Clinical tests on oxygen consumption show excellent performance.
Original languageEnglish
Article numberP04005
Number of pages10
JournalJournal of Instrumentation
Publication statusPublished - Apr 2007


  • front-end electronics for detector readout
  • photon detectors for UV
  • optical detector readout concepts
  • digital signal processing (DSP)
  • solid-photocathodes
  • gas-photocathodes
  • visible and IR photons

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