Question

16. (15 points A. (10 poins) An uasonic trarodecer is used to measure the lood tion as shurwn to the right. The typical blood veloity i 1.34 m's wtile the speed of soand in blood is 1540 ms. The transducer has an outgoing frequncy of 6 24 MH2 Calculate the beat frequency which will result when the echo retum interfores with the oiteoing sigrul Beat frequensy B. (5 poits) Given the picture shows with the blood flowing away foom the transdacer, calcubse the freqaency of the echo (returning frequency Echo frequrncy: Initias: D

Answer 1

Beat frequency is taken out by the below Doppler effect,

$f' = \frac{v + v_o}{v} f$

$f' = \frac{1540 + 1.54}{1540} \times 6.24 \times 10^6$

$f' = 6.24624 \times 10^6 - Hz$

Returning frequency (echo frequency)

$f'' = \frac{v}{v - v_o} f'$

$f'' = \frac{1540}{1540 - 1.54} \times 6.24624 \times 10^6$

$f'' = 6.2524 \times 10^6$