FNIRS Pioneer

All the necessary tools for single-channel FNIRS acquisitions in an affordable hardware kit.

Included Hardware
  • 1x wireless 4-channel hub
  • 1x FNIRS sensor
  • 1x Bluetooth dongle
  • 1x medical-grade charger
Included Software (Digital Content)
  • OpenSignals for real-time data acquisition & visualization
  • Open Signals Mobile app (Android)
  • Cross-platform APIs for software development in Python, C++, Visual C#, Java, Android & MATLAB

The FNIRS Pioneer kit provides all the necessary equipment to conduct signal acquisitions using the biosignalsplux FNIRS sensor (functional Near-Infrared Spectroscopy) and comes with a 4-channel biosignalsplux hub, the FNIRS sensor, a hub charger, and a PLUX-proven Bluetooth dongle.

The FNIRS is an easy-to-use, non-invasive, and portable sensor which uses two emitting LEDs, one in the red region and the other in the infrared region of the spectrum, to measure the red and infrared light reflectance in the cortical tissue.

The emitted light of each one of these LEDs is absorbed by a photodiode, which resulting current can be used to compute an estimation of the blood oxygen saturation level in the monitored brain region or tissue. This method, combined with the sensor’s form-factor, provides a non-intrusive method for brain activity monitoring, which is applicable in a variety of research fields, includ- ing biomedical, psychophysiology, and other functional neuroimaging applications (e.g. Brain-Computer Interface development). Additionally, the acquired sensor data can be used to extract heart rate information, which can be used for further analysis of cardiac activity (e.g. Heart Rate Variability).

Developed for Developers & Researchers

Other than most biosignalsplux sensors, which provide a pre-conditioned analog output, this sensor provides a digital output signal which can be received via SPI. Although it has been designed for signal acquisitions conducted on the forehead, the light intensity of each electrode can be set individually using the biosignalsplux API. This allows one to adjust the light intensities when using this sensor on other regions or research applications with different requirements.

Developed in Cooperation with Charles River Analytics

For the development of this sensor, PLUX has joined Charles River Analytics (CRA) to provide a new affordable miniaturized FNIRS sensor which allows acquisitions of high-quality brain activity data even in settings with heavy physical movement involved – all while keeping the cost of the sensor at a fraction of currently available FNIRS systems.

"An unobtrusive system to measure cognitive state would be useful across multiple domains. Laboratory-based experiments would be easier to conduct and portable in real-world environments. It could be used in Training, such as to assess the effectiveness of curriculum or to tailor the curriculum to the needs of each student. It could also be used during the testing and evaluation of new tools early in the design phase, which would streamline the development of intuitive tools."

- Dr. Bethany Bracken, Project Lead Researcher

Together with research partners at CRA and the McLean Hospital (Harvard Medical school), the development and out-of-the-lab results of this sensors have been thoroughly investigated. Those results are presented in the research team’s paper “A System to Monitor, Extract, and Decode Indicators of Cognitive Workload (MEDIC) in Realistic, High-motion Environments”.

Analog ports 4 generic inputs
Auxiliary ports 1 ground
Resolution Up to 16-bit (per channel)
Sampling rate Up to 3kHz (per channel)
Communication Bluetooth Class II
Range Up to ~10m (extendable)
Internal memory Not included (16GB optionally available)
Battery life ~10h streaming; ~24h logging
Size 85x54x10mm
Weight 45g (without sensors)
Color White
FNIRS Sensor
Dual LED Design 1 red & 1 infrared (IR) LED
Red LED Wavelength 660nm
IR LED Wavelength 860nm
Detector Sensitivity 400nm-1100nm (max@860nm)
Resolution 16-bit
Sampling Rate 500Hz
Communication SPI
Cable Length: 100cm±0.5cm (customizable)

Prototype Disclaimer
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.

Development Disclaimer
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.

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