Distributed Acoustic Sensing in Geophysics. Группа авторов
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Название: Distributed Acoustic Sensing in Geophysics

Автор: Группа авторов

Издательство: John Wiley & Sons Limited

Жанр: Физика

Серия:

isbn: 9781119521778

isbn:

СКАЧАТЬ acoustic sensor. First Break, 37(4), 66–68.

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a(z) arbitrary function
A 0 fiber elongation corresponding to 1 rad of phase shift
A(z, t) output of DAS
A1(z) output of DAS with first order algorithm
A2(z) output of DAS with second order algorithm
b(z) arbitrary function
c optical speed of light in fiber
C speed of sound
D DAS dynamic range
e(t′) optical field of coherent input pulse
E(t′) optical field on photodetector
(K, F) Fourier transforms of seismic signal
Fourier transform symbol
F frequency of sound
F MAX maximum frequency of sound
F S pulse repetition rate or sampling frequency
G(z) geophone antenna response
energy quant
Im Z imaginary part of interference output
Ij (z, t) intensity trace for different interferometric output
I(z, t) photodetector intensity trace
j integer number
K acoustic angular wavenumber
K z acoustic angular wavenumber along fiber
K e ratio of optical to physical length of fiber
L fiber length
L P integration length
L 0 interferometer length also known as gauge length
L S scattering zones spacing
M number of scattering zones
n eff fiber effective refractive index
N F noise figure of amplifier
N number of photons per second
p(z) averaging function
P 0 input peak power
P number of different interferometric ports or pulses
R BS backscattering coefficient of fiber
r0(z) distribution СКАЧАТЬ