Abstract
Concatenated modal interferometers-based multipoint monitoring system for detection of amplitude, frequency, and phase of mechanical vibrations is proposed and demonstrated. The sensor probes are fabricated using identical photonic crystal fiber (PCF) sections and integrated along a single fiber channel to act as a compact and efficient sensing system. Each identical probe acts as a modal interferometer to generate a stable interference spectrum over the source spectrum. In the presence of an external dynamic field about each probe, the probes respond independently, producing a resultant signal superposition of each interferometer response signal. By analyzing the resultant signals using computational techniques, the vibration parameters applied to each interferometer are realized. The sensing system has an operation range of 1 Hz-1 kHz with a sensitivity of 51.5 pm/V. Such a sensing system would find wide applications at industrial, infrastructural, and medical fronts for monitoring various dynamic physical phenomena.
Highlights
Concatenated modal interferometers-based multipoint monitoring system for detection of amplitude, frequency, and phase of mechanical vibrations is proposed and demonstrated
This paper proposes and demonstrates a multipoint vibration sensing technique for detecting instantaneous frequency, amplitude, and phase of vibrations about each interferometer by implementing solid-core photonic crystal fiber (SCPCF) based modal interferometry principle
Such interferometry principle involves fabricating fiber configurations with specialty waveguides such as SCPCF, enabling excitation and recombination of waveguide modes resulting in stable interference spectra over the source spectrum
Summary
Concatenated modal interferometers-based multipoint monitoring system for detection of amplitude, frequency, and phase of mechanical vibrations is proposed and demonstrated. Vibration detection has been demonstrated by measuring the external vibration-induced back-scattered light in conventional fiber using optical time-domain reflectometry (OTDR) techniques that rely on the modulation of the phase (Φ-OTDR)[12,13] polarization state (POTDR)[14], and beam frequency (BOTDR)[15] of the propagating wave in the presence of external perturbation These sensing systems incur diminished sensitivity over long-range distributed sensing and require additional expensive components like pulsed lasers, electro-optic modulators (EOM), and erbium-doped fiber amplifiers (EDFA). This paper proposes and demonstrates a multipoint vibration sensing technique for detecting instantaneous frequency, amplitude, and phase of vibrations about each interferometer by implementing solid-core photonic crystal fiber (SCPCF) based modal interferometry principle Such interferometry principle involves fabricating fiber configurations with specialty waveguides such as SCPCF, enabling excitation and recombination of waveguide modes resulting in stable interference spectra over the source spectrum. The proposed system enables real-time monitoring of dynamic strain about multiple points
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