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.
Highlights
The necessity of continuous vital sign monitoring has been increasing in many aging societies.As sensing equipment is downsized, continuous vital sign monitoring such as electrocardiograph (ECG) [1], phonocardiograph (PCG) [2] and photo-plethysmograph (PPG) [3,4] have become readily available
The fiber Bragg grating (FBG) sensor is a strong candidate for such vital sign monitoring applications
Because they have electromagnetic immunity and high sensitivity, FBG sensors have been used in a variety of applications such as structural health monitoring [8,9,10], vibration sensing under high electromagnetic noise [11,12] and as hydrophones [13,14]
Summary
The necessity of continuous vital sign monitoring has been increasing in many aging societies. Because the main application of the FBG sensors so far are for industrial or seismic sensing [8,9,10,11,12], this difficulty has not been a problem When it comes to a continuous vital sign monitoring system, the size and weight of the measurement system is crucial. We employed a (3) passive filter [37,38,39] to develop a portable FBG interrogation system This system employs an edged filter as the wavelength measuring element, and is small and easy to use, with high precision. A small, commercially available portable battery powers the interrogator, the whole system becomes portable
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