Field Guide to Fiber Optic Sensors

Fiber-optic combined FPI/FBG sensors for monitoring of radiofrequency thermal ablation of liver tumors: ex vivo experiments

“…Unlike standard microelectromechanical systems (MEMS), optical fiber sensors [18] are a suitable candidate, due to their miniature size (e.g., 0.2 mm diameter), tensile and compressive strength (which allows safe insertion despite the small size), immunity to EMI, and the ability to measure multiple parameters while maintaining a small overall size.…”

The laboratory investigation of the innovative sensor for torsional effects in engineering structures’ monitoring

“…The light beam after passing through the optical fibre depolarizer is separated by an X−type coupler I. The coupler II in the optical part is added, after two fibre optic polarizes (43 dB extinction ratio and 0.45 dB insertion loss each) mounted in−line, in order to ensure the same optical path for both counter−propagating beams in the sensor loop [29]. The fibre optic polarizer assures that two both beams have the same polarization state in the first coupler.…”

Frequency-Shifted Interferometry — A Versatile Fiber-Optic Sensing Technique

“…As an offshoot of the fiber-optic communications industry, fiber-optic sensing has attracted considerable attention over the years [1–4]. Fiber-optic sensors have many inherent advantages compared to electrical sensors.…”

“…Fiber-optic sensors are usually more compact, because optical fibers are flexible and lightweight [6,7]. An important feature of fiber-optic sensors is that they have the multiplexing capability—a single system can be used to interrogate multiple sensors linked by off-the-shelf fiber-optic components [1–4,8–14]. To separate signals from different sensors in the sensor network, sensor multiplexing techniques are needed [8–14].…”

“…High sensitivity is another advantage of fiber-optic sensors, especially when a sensor is combined with special measurement methods such as the cavity ring-down (CRD) technique [15–29]. Last but not least, driven by the large telecommunication market, the cost of the components used for fiber-optic sensing is decreasing [4]. We have many reasons to believe that the fiber-optic sensing industry shall have a bright future.…”