Understanding how the sampling integrator works

[brumbarchris]

Some scope pictures with US quarter for target.

Hello!
Not sure if I can make sense of the scope pictures you posted. Are these from a Geotech Baracuda or from something else? My understanding of how the coil works (on the Baracuda) is that you should normally see a large negative spike at the "hot" end of the coil corresponding to each TX pulse; I cannot correlate this to CH1 in your plots, as it only shows a rather small amplitude positive spike.

[green]

Are these from a Geotech Baracuda or from something else? No, separate Tx and Rx inductance balanced. X signal is opposite R signal for non ferrous targets(quarter). If I start sampling when the amplifier is saturated the X signal subtracts from the R signal(less target signal). Was wondering if starting sample when amplifier is saturated with the Baracuda circuit does something similar. Don't have a Baracuda circuit to try.

[brumbarchris]

Great, thanks for clarifying.