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This paper will present a brief perspective on the current status and future potential of fibre optic sensors. In the half century since the concept was first mooted the fibre sensor has established itself in a few specialised niches, predominantly distributed sensing, applications in the electrical power supply industry and the fibre optic gyroscope. The technology continues to develop both in addressing...
In this paper, we present the results of a new pH sensor based on a polyaniline (PAni) coating on the surface of a tilted fiber Bragg grating. The pH-sensitive PAni was deposited by in situ chemical oxidative polymerization. The performance of the fabricated pH sensor was tested and the obtained pH values were compared with the results obtained using a pH meter device. It was found that the sensor...
Gait monitoring system for human activity recognition is demonstrated using a perceptive shoe based on hetero-core fiber optics. The insole with hetero-core fiber monitors foot pressure without temperature dependency and constraint to human body. Monitoring test was performed by a human subject doing basic activities which are walking, walking on the spot, running, standing, and sitting on a chair...
The online monitoring of ice load of transmission lines, which reflects the dynamic load of line, can alert the early stage ice in advance and guarantee the safety of power supply. However, the fiber sensors, which were used in ice online monitoring of overhead transmission lines, usually had low sensitivity and bad repeatability. And the capacity of sensor network was limited and it was difficult...
A Pressure and temperature (P&T) monitoring system based on fiber Bragg grating (FBG) and extrinsic Fabry-Perot interferometer (EFPI) for downhole application is designed and tested. The system is electronically passive, with no electronics downhole, and can monitor downhole pressure and temperature continuously without breaking in production of oil well. It is demonstrated in experimental well...
Robust and real-time condition monitoring of the underground gas distribution network (ca. 3000 km) in Singapore is critical for interruption-free power generation. For this purpose, in this paper, we investigate optical techniques, based on distributed fiber optic sensors, recently proposed in the context of the gas pipeline monitoring. A detailed review of these techniques and their applications...
A novel wavelength-tunable dual-output laser module is proposed. The measured output powers are 13.8 dBm and 10.8 dBm with a low power consumption of 3.0 W. We achieved compactness suitable for a micro-ITLA with no additional external optical components.
Highly-dense information in a structure can be useful to identify deformation, applied loads, or some kind of existing damages in implementation of structural health monitoring (SHM). Fiber-optic distributed strain sensors return a value of strain as a function of the linear position along an optical fiber, as they are having useful characteristics of optical fiber sensors for SHM, such as immunity...
Electric energy has become an important energy source in today's society. But there has been the lack of safe, reliable and effective real-time fire monitoring solutions for the high voltage switchgear, transformers and other critical electrical facilities in the power plants and the transformer substations. Therefore, the optical fiber fluorescence temperature sensor has been developed, which is...
A rigorous thermal monitoring regimen is considered standard practice by those responsible for maintaining critical electrical infrastructure. As thermal imaging technologies mature and infrared cameras become increasingly common, it becomes necessary to understand any limitations that may be imposed by methods that capture data infrequently. This paper will frame the benefits of implementing continuous,...
As a temperature sensor, the fiber gratings get a rapid development with its own advantages. We have done some experiments to test the temperature response characteristic of the optical fiber grating Based on introduce the principle and the structure of the optical fiber grating temperature detection system, and the experiments verified a better fitting relationship between the optical fiber grating...
Five resonant wavelengths could be multiplexed successfully by writing long-period gratings (LPGs) with different pitches. A preliminary distributed temperature monitoring experiment was conducted, and it was estimated that separation between 2 adjacent resonant peaks was 23.7 nm, even when the temperature difference between 2 adjacent LPGs was 100 °C. This separation is large enough to distinguish...
Obtaining temperature information is of great significance to distinguish borehole conditions, monitor oil-field performance, and optimize working system after hydrocarbon exploration and production started. Distributed temperature sensor is developed successively at home and abroad on the issue of gaining continuous temperature profile, which enables the obtainment of wellbore temperature profile...
With the development of smart grid, The distributed optical fiber temperature monitoring system has more and more applications in power cable monitoring area. this paper presents the technology of distributed optical fiber temperature monitoring system running on the power cable, it use to real-time online monitoring for the power cable temperature and carrying capacity, and through carrying capacity...
We fabricated a tapered optical fiber using a Vytran fiber tapering workstation which utilizes a filament as the heat source. The tapered fibers were fabricated with varying dimensions in order to study their effects on the transmission properties. The tapers were characterized by monitoring their transmission during and after tapering process. These transmissions were normalized to the transmission...
Advancements in optical technology have led to the development of a number of different sensor systems suitable for use in the biomedical industry, such as cardiovascular system monitors, lung/bladder pressure sensors and radiation dosimeters. Recent efforts in the Optical Fibre Sensors Research Centre at the University of Limerick have seen the application of all-optical sensors to these areas. This...
This paper demonstrates a novel highly sensitive chromatic dispersion (CD) monitor based on exponential power transfer function (PTF) provided by phase-matched four-wave mixing (FWM). This monitor is robust to optical filter precision errors and can operate without prior knowledge of the transmission rate.
In this paper, we demonstrate and comparatively analyze new techniques for individual fibre-attenuation, fault detection and simultaneous remote temperature measurements in PONs based on remote reflective filters and radio-frequency techniques.
In order to enhance reliability and safety procedures of the dam, it is very important to gather dam behavior data in real-time monitoring system. The sensors installed into dam's structure and in reservoir measure physical quantities of interests such as seepage flow, water level, deformation, pressure and temperature parameters. In this paper, the remote terminal unit (RTU) based on DSPIC30F4011...
The design of transmission lines (TL) is usually based on conservative aspects, in order to attend safety standards and avoid the deterioration of line construction materials. With the increasing demand of energy, the idea to improve the capacity transmission of already existing lines, designed in a high safety manner, is attractive; instead of duplicate or construct new ones. An equipment for monitoring...
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