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Halliday 2 Cap 18 - P18 073

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    December 2018
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73. The reception of the ultrasound by the structure (moving with speed u) and the subsequent remitting of the signal by the structure back toward the detector is a two step process which may be compactly written as     v+u 2+ξ f + ∆f = f =⇒ v = u v−u ξ with ξ = ∆f /f and where we have assumed that the structure is moving toward the detector. If u = 1.00 × 10−3 m/s and ξ = 1.30 × 10−6 , we get v = 1.54 × 103 m/s.