Fiber optic sensing traces its roots to the study of light and optics over the past 400 years, with foundational contributions from scientists such as Snell, Newton, Huygens, Fresnel, Maxwell, and Einstein. The modern era began in the 1960s when Charles Kao proposed using light instead of electric currents and optical fibers instead of metal wires for signal transmission, giving birth to optical fiber technology. By the 1970s, fiber sensing emerged, with the first fiber optic gyroscope (FOG) developed in 1976 for angular velocity measurement and optical time-domain reflectometry (OTDR) introduced in 1977 for fiber break localization .
Fiber optic sensors operate by detecting changes in light propagation within an optical fiber. These changes can result from vibration, strain, temperature, or pressure, measured through naturally occurring backscattering or engineered reflections such as Fiber Bragg Gratings (FBG). Distributed and quasi-distributed systems connect opto-electronic interrogators to fibers, converting the fiber into a continuous array of sensors capable of monitoring conditions along its entire length, often exceeding 45 km . Advantages include immunity to electromagnetic interference, lightweight design, and the ability to perform remote and distributed measurements .
Fiber optic sensing has been applied across multiple domains:
Fiber optic sensing offers high spatial resolution, long-distance monitoring, and durability, with cost-effective deployment using existing fiber infrastructure. The global market for distributed fiber optic sensing is growing rapidly, projected to exceed $2 billion by 2025 . Organizations like the Fiber Optic Sensing Association (FOSA) promote adoption and standardization, supporting applications in smart infrastructure, oil and gas, and environmental protection .
The development of fiber optic sensing is moving toward integration with AI, machine learning, and advanced data analytics, enabling predictive maintenance, real-time hazard detection, and enhanced decision-making. Emerging applications include subsea monitoring, smart cities, and autonomous systems, reflecting the technology's transformative potential across industries .
Optical fiber sensors have become a cornerstone of modern sensing technologies, offering exceptional advantages such as immunity
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Emerging Technologies for Fiber-Optic-Based Sensors in Biomedical Domain: A Review and Recent Developments
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