$\varphi$-OTDR	Phase-sensitive optical time domain reflectometry
ADC	Analog-to-digital converter
AOM	Acousto-optic modulator
DAS	Distributed acoustic sensing
DC	Direct current
DS	Delay-and-sum (beamforming)
DSO	Digital storage oscilloscope
EDFA	Erbium-doped fiber amplifier
FIR	Finite impulse response
FWHM	Full-width-at-half-maximum
GCC	Generalized cross-correlation
LTI	Linear time-invariant (system)
MUSIC	Multiple Signal Classification
NSR	Noise-to-signal ratio
OFDR	Optical frequency domain reflectometry
PSF	Point spread function
RBS	Rayleigh back-scattering
RF	Radio frequency
SNR	Signal-to-noise ratio
SRP	Steered response power
SRP-PHAT	Steered response power—phase transform
SSI	Spatial sampling interval
TDoA	Time difference of arrival
UUT	Unit under test