Passive fiber ring as a device for effective refractive index measurement

Vašinek, Vladimír; Látal, Jan; Koudelka, Petr; Šiška, Petr; Hanacek, Frantisek; Skapa, Jan

doi:10.1117/12.875316

Cited by 1 publication

(1 citation statement)

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“…Nowadays it is the most advanced principle which can be used for monitoring of more than one vibration source along the optical route [10]. For example, in [3] a system based on the phasesensitivity for 19 km long perimeters was described.…”

Section: Distributed Fiber-optic Sensorsmentioning

confidence: 99%

Distributed Fiber-Optic Sensor for Detection and Localization of Acoustic Vibrations

Sifta¹,

Münster²,

Sysel³

et al. 2015

Metrology and Measurement Systems

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A sensing system utilizing a standard optical fiber as a distributed sensor for the detection and localization of mechanical vibrations is presented. Vibrations can be caused by various external factors, like moving people, cars, trains, and other objects producing mechanical vibrations that are sensed by a fiber. In our laboratory we have designed a sensing system based on the Φ-OTDR (phase sensitive Optical Time Domain Reflectometry) using an extremely narrow laser and EDFAs.Keywords: optical fiber sensor, acoustic vibrations, detection, localization, Φ-OTDR.© 2015 Polish Academy of Sciences. All rights reserved IntroductionOptical fibers have been used in a wide range of applications during several last decades. The most visible and known utilization is in the area of telecommunications as the optical fiber technologies can offer bit rates in the range of terabits per second [1]. Fibers have been deployed not only in the area of optical networks but they are also more and more common in the fiber sensor technologies.Sensor applications are an attractive area of the optical fiber usage. The fiber construction, the principle of operation (the total reflection) and the signal form (radiation) make the transmission of data very safe and resistant to many sources of disturbances. At the same time transmitted signals are sensitive to ambient conditions, like the temperature, strain, vibrations or strong ambient electromagnetic field, which make them suitable for sensing purposes. Fiber sensors can be divided into two groups -extrinsic (hybrid) fiber optic sensors and intrinsic fiber optic sensors [2].

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Section: Distributed Fiber-optic Sensorsmentioning

confidence: 99%