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TABLE OF VARIABLES

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
ℑ(K, F)	Fourier transforms of seismic signal
ℑ	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
hυ	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
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