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Wireless, Portable Fiber Bragg Grating Interrogation System Employing Optical Edge Filter

1
Graduate School of Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
2
Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
3
Research & Development Sec. Development Center, Naganokeiki Co., Ltd., 2150 Ikuta, Ueda, Nagano 386-0411, Japan
4
Institute for Fiber Engineering, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
5
Department of Clinical Laboratory Sciences, School of Health Sciences, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(14), 3222; https://doi.org/10.3390/s19143222
Received: 10 June 2019 / Revised: 11 July 2019 / Accepted: 18 July 2019 / Published: 22 July 2019
(This article belongs to the Special Issue Wearable Sensors and Devices for Healthcare Applications)
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Abstract

A small-size, high-precision fiber Bragg grating interrogator was developed for continuous plethysmograph monitoring. The interrogator employs optical edge filters, which were integrated with a broad-band light source and photodetector to demodulate the Bragg wavelength shift. An amplifier circuit was designed to effectively amplify the plethysmograph signal, obtained as a small vibration of optical power on the large offset. The standard deviation of the measured Bragg wavelength was about 0.1 pm. The developed edge filter module and amplifier circuit were encased with a single-board computer and communicated with a laptop computer via Wi-Fi. As a result, the plethysmograph was clearly obtained remotely, indicating the possibility of continuous vital sign measurement. View Full-Text
Keywords: fiber bragg grating; vital sign monitoring; optical edge filter; pulse wave; plethysmograph fiber bragg grating; vital sign monitoring; optical edge filter; pulse wave; plethysmograph
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Ogawa, K.; Koyama, S.; Haseda, Y.; Fujita, K.; Ishizawa, H.; Fujimoto, K. Wireless, Portable Fiber Bragg Grating Interrogation System Employing Optical Edge Filter. Sensors 2019, 19, 3222.

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