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[How-to] Connect & Configure the fNIRS (Functional Near-Infrared Spectroscopy) Sensor


Most of the biosignalsplux sensors are analog sensors which can be connected to any of the available 4 to 8 analog channels of the biosignalsplux hubs. The fNIRS sensor is an exception as this sensor provides a digital output which must be connected and configured differently. Find below all the instructions on how to set-up your fNIRS sensor.

Step 1: biosignalsplux Firmware Requirements

The fNIRS sensor requires a special firmware version in order to work with your biosignalsplux device. Visit the biosignalsplux Firmware page to download the necessary firmware and installation tools to confirm whether you are using the correct firmware or if a downgrade is necessary. The required firmware is listed as SpO2 & fNIRS specific firmware (version 3.4).

After downgrading or installing the correct firmware, your device should appear with an orange biosignalsplux logo in the OpenSignals software, as seen below:

In case the logo is not displayed in orange, remove the device from your OpenSignals device manager and your operating system, reconnect it again, restart the OpenSignals software.

Step 2: Connecting the fNIRS Sensor

The fNIRS sensor is a digital sensor, reason for which it must be connected to the ground/reference channel (digital interface) of your biosignalsplux. This channel is marked with a "down-arrow" as highlighted in the image below:


Note: Current biosignalsplux versions do only support the use of one fNIRS sensor per device.

Step 3: Sensor Configuration in the OpenSignals Software

Open the OpenSignals (r)evolution software and enter the device manager to configure your device with the fNIRS sensor. The fNIRS sensor data is received and visualized via the virtual channels 9 and 10 of the biosignalsplux device.

Set the channel types to fNIRS and set the intensity of the red and infrared LEDs using the RED and IR sliders. Activate the channels 9 and 10 (circles on the channel must turn blue) and activate the device for signal acquisition (ENABLE field must be blue).

If configured correctly, the device panel should be similar to the one shown in the screenshot below:

Step 4: Start the Signal Acquisition

Start the signal acquisition with OpenSignals by clicking on the red button in the OpenSignals main interface.

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