Author Topic: Connecting Ultrasound Transducer Output to Laptop  (Read 1162 times)

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Offline adam2392

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Connecting Ultrasound Transducer Output to Laptop
« on: October 09, 2015, 05:20:16 pm »
I am a beginner/intermediate electronics person. I have never bought electronics components before and only worked on Arduino/Raspberry Pi stuff. Hoping to get some guidance, so that I know what I am buying and why I am buying it and how to setup a hardware setup to get an analog signal.

Background: My setup currently has 2 ultrasound transducers. I will pulse one of them and then collect output from the other. My problem has to do will collecting the output. Normally, one can do this via an oscilloscope, but I want to gather this data and store it/transfer it to my laptop, so that I can run digital signal processing on it.

I am trying to get a signal that is coming out of an ultrasound transducer at ~1MHz +/- 5V. It is a sinusoidal analog signal that is generated from the ultrasound transducer. I suppose I would like a resolution of 10 bits (should be good enough for +/-5V). And for Nyquist sampling, I would want something sampling at probably 3MHz to capture the signal effectively.

I am wondering what sort of ADC is out there that can do this. If so, where can I find this and how should I go about buying it. Would you be able to provide me with some links and specific examples? I go on google and search and I feel like I just get bombarded with different results I don't understand.
 

Offline f5r5e5d

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Offline ealex

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Re: Connecting Ultrasound Transducer Output to Laptop
« Reply #2 on: October 10, 2015, 10:40:54 am »
how do you need to process the 1Mhz sinewave?  you can use a ne602 mixer and downconvert the signal to something that an audio card can handle - like done in the cheap SDR receivers. i've seen this used in some 'bat detector' circuit somewhere.
 

Offline adam2392

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Re: Connecting Ultrasound Transducer Output to Laptop
« Reply #3 on: October 12, 2015, 06:53:18 pm »
The digilent seems too expensive. It is >200$. I was looking for a cheap way to get the signal and into the laptop. If I have to do some extra steps digitally that is fine.

I am trying to process the 1 MHz signal spectrally. So this means conducting FFT on it to get frequency characteristics out of it.
 


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