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Rev Sci Instrum. 2014 Feb;85(2):026111. doi: 10.1063/1.4865124.

Note: three wavelengths near-infrared spectroscopy system for compensating the light absorbance by water.

Author information

  • 1Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, South Korea.
  • 2Department of Biomedical Engineering, Korea University, Seoul 136-703, South Korea.
  • 3Department of Education Policy and Social Analysis, Columbia University, New York, New York 10027, USA.
  • 4Department of Physical and Rehabilitation Medicine, Sungkyunkwan University School of Medicine, Seoul 135-710, South Korea.


Given that approximately 80% of blood is water, we develop a wireless functional near-infrared spectroscopy system that detects not only the concentration changes of oxy- and deoxy-hemoglobin (HbO and HbR) during mental activity but also that of water (H2O). Additionally, it implements a water-absorption correction algorithm that improves the HbO and HbR signal strengths during an arithmetic task. The system comprises a microcontroller, an optical probe, tri-wavelength light emitting diodes, photodiodes, a WiFi communication module, and a battery. System functionality was tested by means of arithmetic-task experiments performed by healthy male subjects.

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