Converting Ultrasound machine to Doppler Ultrasoun

[pnm6]

I have a US machine that I would like too modify to make Doppler measurements too. Any thoughts? Ideas?

Also I know you need to mix the recived signal with a reference version of the transmitted signal to get the doppler frequency shift. How do I generate this reference signal?

 

[Mike zhang]

you can get the reference signal from the osculor of your system.What you need to do is only amply it.

Added after 22 seconds:

you can get the reference signal from the osculor of your system.What you need to do is only amplify it.