A new technique for dynamic phase calibration that utilizes only visual observation of the fringe pattern is demonstrated for use in fiber-optic interferometric sensors and phase modulators. The need for a photodetector and its associated electronic circuitry is completely eliminated. Observations show that random changes in phase, source intensity, and fringe visibility do not affect the phase calibration. Since no phase bias or feedback is necessary, the new method is simple and fast. This technique is of universal applicability to any two-beam interferometer incorporating dynamic sinusoidal displacements.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/ol.14.001287 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The Challenges and Opportunities for Performance Enhancement in Resonant Fiber Optic Gyroscopes.
Sensors (Basel)
January 2025
Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
In the last decade, substantial progress has been made to improve the performance of optical gyroscopes for inertial navigation applications in terms of critical parameters such as bias stability, scale factor stability, and angular random walk (ARW). Specifically, resonant fiber optic gyroscopes (RFOGs) have emerged as a viable alternative to widely popular interferometric fiber optic gyroscopes (IFOGs). In a conventional RFOG, a single-wavelength laser source is used to generate counter-propagating waves in a ring resonator, for which the phase difference is measured in terms of the resonant frequency shift to obtain the rotation rate.
View Article and Find Full Text PDFIntelligent Pattern Recognition Using Distributed Fiber Optic Sensors for Smart Environment.
Sensors (Basel)
December 2024
Centre for Photonic Devices and Sensors, Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK.
Distributed fiber optic sensors (DFOSs) have become increasingly popular for intrusion detection, particularly in outdoor and restricted zones. Enhancing DFOS performance through advanced signal processing and deep learning techniques is crucial. While effective, conventional neural networks often involve high complexity and significant computational demands.
View Article and Find Full Text PDFAC Magnetometry Using Nano-ferrofluid Cladded Multimode Interferometric Fiber Optic Sensors for Power Grid Monitoring Applications.
ACS Appl Nano Mater
December 2024
Mechanical Engineering & Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.
The AC magnetic field response of the superparamagnetic nano-ferrofluid is an interplay between the Neel and Brownian relaxation processes and is generally quantified via the susceptibility measurements at high frequencies. The high frequency limit is dictated by these relaxation times which need to be shorter than the time scale of the time varying magnetic field for the nano-ferrofluid to be considered in an equilibrium state at each time instant. Even though the high frequency response of ferrofluid has been extensively investigated for frequencies up to GHz range by non-optical methods, harnessing dynamic response by optical means for AC magnetic field sensing in fiber-optic-based sensors-field remains unexplored.
View Article and Find Full Text PDFPicometre-level surface control of a closed-loop, adaptive X-ray mirror with integrated real-time interferometric feedback.
J Synchrotron Radiat
January 2025
CAEN, Viareggio, Italy.
We provide a technical description and experimental results of the practical development and offline testing of an innovative, closed-loop, adaptive mirror system capable of making rapid, precise and ultra-stable changes in the size and shape of reflected X-ray beams generated at synchrotron light and free-electron laser facilities. The optical surface of a piezoelectric bimorph deformable mirror is continuously monitored at 20 kHz by an array of interferometric sensors. This matrix of height data is autonomously converted into voltage commands that are sent at 1 Hz to the piezo actuators to modify the shape of the mirror optical surface.
View Article and Find Full Text PDFRevolutionizing Underwater Sensor Performance: Tackling Rayleigh Scattering Challenges by Pseudo Random Noise.
Adv Sci (Weinh)
December 2024
College of Meteorology and Oceanography, National University of Defense Technology, Changsha, Hunan, 410073, China.
Traditionally, Rayleigh scattering is thought to only impact fiber sensing system performance when the leading fiber is over 10 km long. However, this report illustrates theoretically and experimentally that Rayleigh scattering cannot be ignored in fiber optic interferometric sensor (FOIS) even with several hundred-meter common leading fiber because of the interaction of Rayleigh backward scattering (RBS) and returning interference signal. Herein, a conceptual framework is developed to elucidate the interaction between RBS and FOIS interference, revealing that, beyond laser monochromacity, the self-correction characteristic of laser pulses also influences coherent superposition.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!