13
transducer (emitter)
transducer (receiver)
c
α
c
α
α
c
β
β
γ
reduction in distance
in the transducer
pipe wall
flow direction
c
γ
of the medium
sound path without flow
sound path with flow
Fig. 3.2: Sound path of the signal in the flow direction
transducer (receiver)
transducer (emitter)
increase in distance
in the transducer
c
α
c
α
α
c
β
β
pipe wall
γ
flow direction
c
γ
of the medium
sound path without flow
sound path with flow
Fig. 3.3: Sound path of the signal against the flow direction
Fig. 3.4: Transit time difference ∆t
signal in th
flow directio
e
n
nal against
flow direction
sig
the
∆t
