The FNIRS Explorer (functional near-infrared spectroscopy) is a wireless and ruggedized wearable FNIRS acquisition system. Powered by a Quad-LED system - 2 red & 2 infra-red (IR) LEDs – and a triaxial accelerometer makes this system ideal for high-dynamic in- and out-of-the-lab setups.
The FNIRS Explorer uses two pairs of LEDs, with each pair containing one LED in the red region and one in the IR region of the spectrum, and one detector to measure the red and IR light reflectance in the cortical tissue. The light reflectance varies with the activity level of the observed brain region due to the changes in oxygen saturation levels, which can be estimated from the raw data provided by this system.
The Quad-LED system and the silicon casing of the FNIRS Explorer are designed to suit the requirements of high-dynamic out-of-the-lab applications where the use of standard Dual-LED FNIRS sensors (e.g. biosignalsplux FNIRS Pioneer) could be limited. For instance, motion artifacts affecting Dual-LED FNIRS systems can put the reliability of the acquired data at risk, while the Quad-LED system reduces such risks due to the second pair of LEDs providing an additional source of brain activity data. The LED intensities can be adjusted via the OpenSignals software to suit even the most demanding applications.
PLUX has joined Charles River Analytics (CRA) for the development of this wearable to provide a new ruggedized FNIRS wearable which allows acquisition of high-quality brain activity data even in settings with heavy physical movement involved.
|Output Channels||2x FNIRS & 3x ACC|
|Quad-LED system||2 red & 2 IR LEDs|
|Red LEDs Wavelength||660nm|
|IR LEDs Wavelength||860nm|
|Resolution||16-bit (FNIRS) & 14-bit ACC|
|Sampling Frequency||10Hz, 20Hz, 50Hz, or 100Hz|
|Range||up to ~10m|
|Battery||integrated 800mAh rechargable 3.7V LiPo|
|Battery Lifetime||Up to 50h|
The enclosure of the FNIRS Explorer is currently under development, reason for which it is only available as an early version of the final solution. The design and appearance of the actual wearable can differ from slightly from the solution presented on this page. However, the functionality of the hardware is not limited.
The development of this sensor is based upon work supported by the United States Army Medical Research and Materiel Command under Contract No. W81XWH-14-C-0018 and United States Air Force under Contract No. FA8650-14-C-6579. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the United States Army Medical Research and Materiel Command or the United States Air Force.