Abstract
Over the last years, fiber optic sensors have been increasingly applied for applications in environments with a high level of radiation as an alternative to electrical sensors, due to their: high immunity, high multiplexing and long-distance monitoring capability. In order to assess the feasibility of their use, investigations on optical materials and fiber optic sensors have been focusing on their response depending on radiation type, absorbed dose, dose rate, temperature and so on. In this context, this paper presents a comprehensive review of the results achieved over the last twenty years concerning the irradiation of in-fiber Long Period Gratings (LPGs). The topic is approached from the point of view of the optical engineers engaged in the design, development and testing of these devices, by focusing the attention on the fiber type, grating fabrication technique and properties, irradiation parameters and performed analysis. The aim is to provide a detailed review concerning the state of the art and to outline the future research trends.
Highlights
Beyond their typical applications for communications and sensing, optical fibers and fiber sensors have found wide interest in radiation related scenarios, due to their several advantages such as: high sensitivity and resolution measurements, low cost implementation, immunity to electromagnetic interferences, chemical inertness, long distance monitoring and high multiplexing capability [1,2,3].there is great interest in studying ionizing and non-ionizing radiation effects on fiber optic devices to allow their use, for example, in aerospace, nuclear installations and high energy physics experiments
We conducted a thorough review of the state of the art concerning the irradiations performed on Long Period Gratings (LPGs) over the last twenty years
We considered all the contributions to the topic by the research groups working in this field
Summary
Beyond their typical applications for communications and sensing, optical fibers and fiber sensors have found wide interest in radiation related scenarios, due to their several advantages such as: high sensitivity and resolution measurements, low cost implementation, immunity to electromagnetic interferences, chemical inertness, long distance monitoring and high multiplexing capability [1,2,3]. There is great interest in studying ionizing and non-ionizing radiation effects on fiber optic devices to allow their use, for example, in aerospace, nuclear installations and high energy physics experiments Based on their response, fiber optic sensors can be used for the measurement of several parameters in radiative environments if they are able to withstand the radiations, alternatively they can be used even as dosimeters by exploiting the radiation induced degradation of materials [4]. The RIA consists of an increase of the fiber attenuation due to radiation induced defects Such an effect is dependent on both the irradiation parameters (dose or fluence, dose rate or flux, temperature, light power, operating wavelength) and fiber properties (geometry and composition of core and cladding, coating material, manufacturing process). The attention is focused on the fiber type, grating fabrication technique and properties, irradiation parameters and performed analysis
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