Abstract
Chemical sensing is of great importance in many application fields, such as medicine, environmental monitoring, and industrial process control. Distributed fibre-optic sensing received significant attention because of its unique feature to make spatially resolved measurements along the entire fibre. Distributed chemical sensing (DCS) is the combination of these two techniques and offers potential solutions to real-world applications that require spatially dense chemical measurements covering large length scales. This paper presents a review of the working principles, current status, and the emerging trends within DCS.
Highlights
The function of an optical fibre sensor is to measure some physical, chemical, or biological parameter that modifies some optical property of the system [1].Optical fibres have favourable properties such as being lightweight, small in size, low in cost, and having low attenuation and immunity to electromagnetic interference, making them an ideal sensing medium for a wide range of real-world applications [2,3].Optical fibre sensors are suited for chemical monitoring and analysis due to their ability to withstand harsh working conditions, and their small volume and inert nature enable them to have minimal impact on the environment
This paper presents a review of the working principles, current status, and the emerging trends within Distributed chemical sensing (DCS)
This paper presents a comprehensive overview of distributed fibre-optic chemical sensors presented in the scientific literature
Summary
The function of an optical fibre sensor is to measure some physical, chemical, or biological parameter that modifies some optical property of the system (e.g., intensity, polarisation, phase, etc.) [1].Optical fibres have favourable properties such as being lightweight, small in size, low in cost, and having low attenuation and immunity to electromagnetic interference, making them an ideal sensing medium for a wide range of real-world applications [2,3].Optical fibre sensors are suited for chemical monitoring and analysis due to their ability to withstand harsh working conditions, and their small volume and inert nature enable them to have minimal impact on the environment. The function of an optical fibre sensor is to measure some physical, chemical, or biological parameter that modifies some optical property of the system (e.g., intensity, polarisation, phase, etc.) [1]. Fibre-optic chemical sensors exploited optical fibres just as a transmission medium to guide the light to and from the sensing region. In this type of arrangement, known as an extrinsic optical fibre sensor, the light is modified either via direct interaction with the analyte or with a sensor element outside the fibre that has some property that varies in the presence of an analyte [4]. The optical fibres themselves are used as a sensing medium. In order to overcome this, a transductive element can be used to convert the chemical information to parameters of the fibre that can be recovered, such as a strain/temperature or optical transmission [5,6,7,8]
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