Hi There,
I'm quite new to the forum and new to electronics in general so I'd appreciate any help I can get.
My project in mind would receive ultrasound from a source at (5Mhz-10Mhz) using a piezoelectric transducer, amplify the signal, and send it back through the same transducer in phase with the reflected ultrasound waves in order to amplify the strength of the ultrasound echo.
I understand that using the same transducer to receive and transmit simultaneous would produce impossible feedback just like trying to use a microphone as a speaker at the same time. But I think I can curb around this issue by using the transducer in periods of "listening" and "sending" modes, and by generating a synthesized signal to amplify the reflected wave. The transducer can listen for periods of around 200us, calculate the frequency of the received wave, generate the same wave frequency and send it out for 200us before it goes into "listening mode" again.
I'm not sure if it is possible to achieve these functions using a fully analog design, so I'm considering using a microcontroller to calculate the frequency and generate the synthesized waveform before sending it out on an amplifier circuit. I'm processing ultrasound waves at 5-10 Mhz, so the processing speed would need to be relatively fast to make sure the ultrasound waves stay in phase. I'd like to know whether this approach would be possible, and any risks and issues I might run into. If anyone has suggestions on a different approach to amplify "echoes", so to speak, I'd love to hear from you.
Thanks!
Eric
I'm quite new to the forum and new to electronics in general so I'd appreciate any help I can get.
My project in mind would receive ultrasound from a source at (5Mhz-10Mhz) using a piezoelectric transducer, amplify the signal, and send it back through the same transducer in phase with the reflected ultrasound waves in order to amplify the strength of the ultrasound echo.
I understand that using the same transducer to receive and transmit simultaneous would produce impossible feedback just like trying to use a microphone as a speaker at the same time. But I think I can curb around this issue by using the transducer in periods of "listening" and "sending" modes, and by generating a synthesized signal to amplify the reflected wave. The transducer can listen for periods of around 200us, calculate the frequency of the received wave, generate the same wave frequency and send it out for 200us before it goes into "listening mode" again.
I'm not sure if it is possible to achieve these functions using a fully analog design, so I'm considering using a microcontroller to calculate the frequency and generate the synthesized waveform before sending it out on an amplifier circuit. I'm processing ultrasound waves at 5-10 Mhz, so the processing speed would need to be relatively fast to make sure the ultrasound waves stay in phase. I'd like to know whether this approach would be possible, and any risks and issues I might run into. If anyone has suggestions on a different approach to amplify "echoes", so to speak, I'd love to hear from you.
Thanks!
Eric