Characteristics Of Fiber-optic Sensors Research Articles

Advances in Tapered Optical Fiber Sensor Structures: From Conventional to Novel and Emerging

Optical fiber sensors based on tapered optical fiber (TOF) structure have attracted a considerable amount of attention from researchers due to the advantages of simple fabrication, high stability, and diverse structures, and have great potential for applications in many fields such as physics, chemistry, and biology. Compared with conventional optical fibers, TOF with their unique structural characteristics significantly improves the sensitivity and response speed of fiber-optic sensors and broadens the application range. This review presents an overview of the latest research status and characteristics of fiber-optic sensors and TOF sensors. Then, the working principle of TOF sensors, fabrication schemes of TOF structures, novel TOF structures in recent years, and the growing emerging application areas are described. Finally, the development trends and challenges of TOF sensors are prospected. The objective of this review is to convey novel perspectives and strategies for the performance optimization and design of TOF sensors based on fiber-optic sensing technologies.

Research on Characteristics of Fiber Optic Sensors for Anthropomorphous Robots

Structure, operating principle, theoretical provisions, experimental characteristics of fiber optic sensors for control of a bending in phalanxes of the anthropomorphous robot fingers, as well as principle of compensation for cross impact of adjacent measuring channels are considered. Linearization algorithm of positional characteristic of a sensor is given. The use of compensation algorithms of the cross impact and the linearization of the positional characteristic of sensing element offered to reduce nonlinearity of the sensor positional characteristic to 1% and to reduce the cross impact of different measuring channels to minus 20dB, which is confirmed by experimental studies. Results of the experimental studies revealed that even without application of special temperature correction methods, the sensors used possess sufficiently high stability. Their phalanx temperature coefficient does not exceed 0,08%/°C. Assessment of high-speed performance of system, taking into account computing opportunities of the electronic transceiver is carried out. Technical characteristics of sensor prototypes and the electronic transceiver of fiber optical system are given.

An In-depth Review: Structural Health Monitoring using Fiber Optic Sensor

Fiber optic sensors (FOSs) are being extensively developed and utilized in various fields due to their exclusive properties compared with conventional sensing technologies, such as their complete immunity to electromagnetic interference, capability of functioning in hostile surroundings, elevated sensitivity, and user-friendliness. The deterioration of concrete structures over time is one of the major growing problems worldwide. The characteristics of FOSs can provide more accurate and precise detection of crack damage in these structures. In this paper, the latest research and progress activities regarding crack detection in concrete structures have been investigated and discussed. This paper also provides a comprehensive critical review and comparison study of various approaches used in detecting crack damage using FOSs. A separate section is devoted to highlight the areas where further improvements are required. The compatibility and sustainability of the latest FOSs in detecting damage have also been studied and evaluated in this paper.

Designing reflectometric fiber-optic displacement sensors

The general principles governing the operation of reflectometric fiber-optic sensors are considered. A classification is presented of all the known methods of controlling the characteristics of fiber-optic sensors. In addition, a new control method, involving the design of a specially designed optical inhomogeneity on the surface of the measurement object, is described.