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Table 2

Pipe impedance determined from the directional pressure wave coming from the upstream side of the dual-sensor and propagating towards the dead-end (Figure 6(a))

CasesReflection coefficient R1,2Reflection coefficient R1,3Reflection coefficient R2,3Determined impedance BC (s/m2)
Numerical 0.040 −0.10 −0.10 285,000 
FBG 0.0588 −0.0962 −0.0965 287,000 
Conventional 0.0497 −0.110 −0.110 280,000 
CasesReflection coefficient R1,2Reflection coefficient R1,3Reflection coefficient R2,3Determined impedance BC (s/m2)
Numerical 0.040 −0.10 −0.10 285,000 
FBG 0.0588 −0.0962 −0.0965 287,000 
Conventional 0.0497 −0.110 −0.110 280,000 
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