Optical magnetometers with high resolution, integrability, and reconfigurability have been central to the development of advance photonic devices for remote and efficient magnetic field sensing. These magnetometers have mostly been based on ferromagnetic materials that detect only static magnetic fields. Here, the limitation is overcome by utilizing an interferometric technique to demonstrate a reconfigurable fiber‐based magnetometer that is highly sensitive to both static and dynamic magnetic fields. The proposed sensor shows an unprecedented sensitivity of 37.07 nm/mT for static magnetic field that could enable detection of few nanotesla fields with a high‐resolution optical spectrometer. Furthermore, the proposed magnetometer has wide dynamic range extending over a frequency band of 0–1700 Hz with significant signal to noise ratio (16.04 dBm at 615 Hz) that enables precise frequency determination of the signal. The large reconfigurability, dynamic operation frequency, and portability of the demonstrated magnetometer ascertain practical applications in broad range of technologies including cardiovascular health monitoring, underground mineral exploration, and marine surveillance.
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.
Utilization of flexible optical systems for real-time comprehensive physiological monitoring has been restricted by their low mechanical robustness and reconfigurability. Here we report a mechanically robust, reconfigurable, flexible, and wearable photonic interferometer system for real-time precision tracking of limb activities, facial motions, respiration, and pulse rate with significant temporal stability and repeatability. Vital health diagnostic parameters have been measured by virtue of a highly sensitive response of the system. The proposed system features curvature sensitivity of 3.1 nm/m–1 over the range of 0–1.71 m–1, temperature sensitivity of 284 pm/°C between 30 and 60 °C, and physical strain sensitivity of 540 pm/1% tensile strain. Such a robust, reconfigurable, and sensitive system would have a wide practical and sustainable utility for real-time dynamic activity monitoring in health, industrial, and various other sectors.
Concatenated modal interferometers-based multipoint sensing 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 presence of external dynamic field about each probe, the probes respond independently, producing a resultant signal that is a superposition of each interferometer response signal. By analysing 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 unsteady physical phenomena.
An optical signal conditioning technique for dynamic modulation of signals and real-time monitoring of events is pivotal for developing various optical systems at micro/nano dimensions. The utilities of such technique include controllable signal enhancement and distinctive response towards external stimuli, with reconfigurable operational range. Here, we propose and demonstrate an optical technique based on the parallel integration of fiber modal interferometers for optical response enhancement and multi-signal monitoring. Overlap of the interferometers’ characteristic spectra facilitates controllable signal filtering, attenuation, and amplification of interferometer’s response towards dynamic field over wide frequency range of 1 Hz – 1 kHz. Signal to noise ratio (SNR) enhancement of 9 dB is achieved by applying 1 volt about the reference interferometer. The system enables real-time modulation of optical signals and multipoint signal monitoring using machine learning for various applications such as mechanical vibrations, acoustic fields, biological samples, fluid movement, and other similar dynamic fields.
An optical signal conditioning technique for dynamic modulation of signals and real-time monitoring of events is pivotal for developing various optical systems at micro/nano dimensions. The utilities of such technique include controllable signal enhancement and distinctive response towards external stimuli, with reconfigurable operational range. Here, we propose and demonstrate an optical technique based on the parallel integration of fiber modal interferometers for optical response enhancement and multi-signal monitoring. Overlap of the interferometers’ characteristic spectra facilitates controllable signal filtering, attenuation, and amplification of interferometer’s response towards dynamic field over wide frequency range of 1 Hz – 1 kHz. Signal to noise ratio (SNR) enhancement of 9 dB is achieved by applying 1 volt about the reference interferometer. The system enables real-time modulation of optical signals and multipoint signal monitoring using machine learning for various applications such as mechanical vibrations, acoustic fields, biological samples, fluid movement, and other similar dynamic fields.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.