Fiber vibration sensors have shown great performance in structural safety monitoring. In this work, a fiber vibration sensor with an ultra-broadband frequency response based on single-mode-few-mode fiber coupler (SFC) was demonstrated. The SFC was fabricated with a pre-stretched single- mode fiber (SMF) and a few-mode fiber (FMF) by weak fusion technology. The proposed vibration sensor has an ultra-broadband sensing frequency response span from infrasound (Hz) to ultrasonic (MHz) with high linearity of ≈1 and good fidelity. What is more, the highest signal-to-noise ratio (SNR) of single- and dual-frequency vibration detection are separately ~108 dB and ~105 dB and damped vibration signals with different frequencies can be detected as well. Additionally, the sensor has highly stable cross-sensitivity at low temperature, which can be applied in structural health monitoring and environmental assessment.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.