Fundamentals of Optical Fiber Sensors by Zujie Fang, Ken Chin, Ronghui Qu, Haiwen Cai, Kai Chang

By Zujie Fang, Ken Chin, Ronghui Qu, Haiwen Cai, Kai Chang

This e-book describes the most recent improvement in optical fiber units, and their purposes to sensor expertise. Optical fiber sensors, a massive program of the optical fiber, have skilled quickly improvement, and attracted vast attentions in uncomplicated technology in addition to in sensible applications. Sensing is frequently likened to human experience organs. Optical fiber cannot basically delivery info bought by way of sensors at excessive pace and massive quantity, but additionally can play the jobs of sensing point itself. Compared with electrical and different varieties of sensors, fiber sensor expertise has specified merits. It has benefits over traditional cumbersome optic sensors, equivalent to mix of sensing and sign transportation, smaller dimension, and chance of creating disbursed systems. Fiber sensor know-how has been utilized in a number of parts of undefined, transportation, communique, protection and protection, in addition to day-by-day life. Its value has been turning out to be with the development of the expertise and the growth of the scope of its software, a development this booklet totally describes.Content:
Chapter 1 creation (pages 1–9):
Chapter 2 basics of Optical Fibers (pages 10–75):
Chapter three Fiber Sensitivities and Fiber units (pages 76–182):
Chapter four Fiber Gratings and similar units (pages 183–277):
Chapter five disbursed Optical Fiber Sensors (pages 278–350):
Chapter 6 Fiber Sensors with precise purposes (pages 351–394):
Chapter 7 Extrinsic Fiber Fabry–Perot Interferometer Sensor (pages 395–426):

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20a) (r > a2 ). 20b) (r > a2 ). where βt1 = n 21 k02 − β 2 , βt2 = |n 22 k02 − β 2 |, and βt3 = |n 23 k02 − β 2 |. By usual notations, Jν and Nν are the νth-order Bessel functions of the first and second kinds; Iν and K ν are the modified Bessel functions of the first and second kinds. The third region is usually the air with n 3 = 1. When the incident angle at the boundary between the cladding and the surrounding medium is less than the critical angle, the optical beam is radiation mode with β < n 3 k0 and R(r ) = C Hν (βt3r ), where Hν is the Hankel function.

20a) (r > a2 ). 20b) (r > a2 ). where βt1 = n 21 k02 − β 2 , βt2 = |n 22 k02 − β 2 |, and βt3 = |n 23 k02 − β 2 |. By usual notations, Jν and Nν are the νth-order Bessel functions of the first and second kinds; Iν and K ν are the modified Bessel functions of the first and second kinds. The third region is usually the air with n 3 = 1. When the incident angle at the boundary between the cladding and the surrounding medium is less than the critical angle, the optical beam is radiation mode with β < n 3 k0 and R(r ) = C Hν (βt3r ), where Hν is the Hankel function.

16 shows a ray propagating in a medium with index n = n(x), which is modeled as a multilayer medium with homogeneous index in each layer. The ray is refracted at each interface according to Snell’s law: n i cos ϕi = n i+1 cos ϕi+1 . In the limitation of δx → 0, the ray should obey an equation of n(x) cos ϕ(x) = n(0) cos ϕ0 = Const. 1, the GRIN fiber was invented at an early stage, and is still used widely. Its characteristics have been investigated in detail [3,9,32]. 81b) where = [n 2 (0) − n 2 (a)]/2n 2 (0) ≈ [n(0) − n(a)]/n(0) = (n 1 − n 2 )/n 1 .

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