PHY13 Ultrasonic Doppler Effect

Ultrasonic Doppler Effect Introduction to the basics of flow measurement based on the acoustic or ultrasonic Doppler effect The experiment introduces the basics of flow measurement based on the acoustic or ultrasonic Doppler effect and investigates its dependence on flow velocity and Doppler angle. Keywords: frequency shift, scattering, Doppler effect, Doppler sonography, flow measurement The Doppler effect is the change in the perceived frequency of waves while the transmitter and receiver are moving relative to each other. This effect is used to image moving structures. For example, the flow velocity or flow rate of a liquid stream can be determined using ultrasound. The frequency shift of an ultrasonic wave that is coupled into the liquid stream at a certain Doppler angle is measured when the wave is scattered by small particles, such as contaminants. In the experiment, the dependence of the Doppler frequency shift Δf on the flow velocity v (movement speed of the scattered particles