Hi! I want to make an ultrasonic leak detector. Generally, they consist mainly of an ultrasonic transducer and an analog demodulator with a carrier of 40Khz which they enable to hear and to measure an audio signal from 0 to 1.5 or 3Khz. How I can make that digitally? I'm thinking about to make it through undersampling. That is, to sample at 38.5Khz to obtain an spectra from 0 to 3Khz, from a ultrasonic signal of 38.5 to 41.5Khz. I suppose that the ADC hold time must be less than 1/2*Fmax=1/80Khz. Is it right? Any advise will be greatly appreciated. Thanks
digital ultrasonic demodulator by undersampling
Started by ●July 24, 2007