Professor Shouhei Koyama

Shouhei Koyama, received the M. Eng. in 2005 from Shinshu University, Japan, and the Dr. Eng. in 2012 in Instrumentation and Measurement Technology from Shinshu University, Japan.

Currently, he belongs to the division of smart textiles, Institute of Fiber Engineering, Shinshu University. His main research interest is optical measurement application such as vital sign sensing system based on Fiber Bragg Grating, non-invasive blood glucose measurement by using spectroscopic method, and application of the spectroscopy (NIRs, IRs, THzs) to measure the content of the textile products.

He is a member of IEEE, the Society of Fiber Science and Technology, Japan, The Illuminating Engineering Institute of Japan, The Society of the Instrumentation and Control Engineers, and so on.



“Fiber Sensors as the Cutting Edge Materials for Smart Textiles”

Peoples’ concern for their health care has caused a strong need for a sensor system that could monitor our vital signs non-invasively, rapidly, and continuously. This lecture describes a new sensing system for human vital signs by using the technology of the fiber Bragg grating (FBG) sensing method. Fiber Bragg Grating sensors (FBG) have the grating in their core along the axis direction. This works as a high sensitive strain sensor of which the special resolution is as small as 10mm or less. It could detect pulse waves by attaching the FBG on a body surface. Based on the measured pulse waves, heart rates, respiration rates, blood pressures, and so on could be measured. This describes the measurement principles and its application results as well. As a result, it has been proved that FBG could measure these vital signs by the subject experiments. Based on the experimental result mentioned above, this lecture will show the newly developed and covered FBG sensor, which could be embedded in a textile. Therefore, health monitoring with smart textiles could be possible by applying these technologies. Practical small interrogators for covered FBG sensors will be introduced as well as the further view of these smart textiles.

The evolution of health monitoring applications of wearable systems could be categorized into some generations. The first generation is “a single sensing modality with wireless connectivity”. The second one is “continuous monitoring with multiple sensors”. Finally, “combining continuous health monitoring with other sources of medical knowledge” has been studied. Healthcare monitoring devices from wearable sensors are used in smart implants nowadays. The FBG sensor applications to health monitoring in this lecture are now in the second generation. FBG can measure almost all the vital signs continuously. This lecture will show that FBG and its embedded smart textiles aim to combine with other sources of medical knowledge in the near future.