Review of fiber Bragg grating sensor technology

Abstract

The current status of the fiber Bragg grating (FBG) sensor technology was reviewed. Owing to their salient advantages, including immunity to electromagnetic interference, lightweight, compact size, high sensitivity, large operation bandwidth, and ideal multiplexing capability, FBG sensors have attracted considerable interest in the past three decades. Among these sensing physical quantities, temperature and strain are the most widely investigated ones. In this paper, the sensing principle of FBG sensors was briefly introduced first. Then, we reviewed the status of research and applications of FBG sensors. As very important for industrial applications, multiplexing and networking of FBG sensors had been introduced briefly. Moreover, as a key technology, the wavelength interrogation methods were also reviewed carefully. Finally, we analyzed the problems encountered in engineering applications and gave a general review on the development of interrogation methods of FBG sensor.

Optical Inclinometer Based on a Phase-Shifted Bragg Grating in a Taper Configuration

“…Be it in series or by itself, this type of structure can be used in several applications, namely in civil or aeronautical engineering for curvature or inclination sensing, in which case the sensor interrogation can be performed with cheaper and more practical techniques than an OSA, such as tunable optical filtering or interferometry [15].…”

Universal Signal Conditioning Technique for Fiber Bragg Grating Sensors in PLC and SCADA Applications

“…Figure 2 shows the principle of operation of transmit-reflect detection. A review of FBG sensors and interrogation techniques is given in [6]. …”

“…As with PLCs, optical fibre sensors are now used in a large variety of diverse applications and are capable of measuring many different types of signals, both static and dynamic, including temperature, pressure, level and flow, as well as chemical and biological measurands [6][7][8]. It is well recognized that optical fibre sensors have many desirable attributes, which are advantageous with respect to other sensing methodologies, which include greater sensitivity, reduced size and weight and immunity to electromagnetic interference.…”

Thermal Poling of Optical Fibers: A Numerical History

“…Since their early implementation in the 1920s [1,2] and subsequent optimization in the 1970s [3] optical fibers have become the most widespread technological platform for telecommunications, mainly due to their relatively low losses and huge bandwidths which greatly exceed the performances of any other system for the transmission of information [4]. For example, it is possible to dope optical fibers with rare earth ions such as erbium to obtain optical amplifiers [5], with ytterbium or neodymium to create fiber lasers, or to embed Bragg grating mirrors and filters into them [6].…”