Hello, I'm running an experiment using perturbation goggles. I'm trying to obtain a trigger event from the occurrence of a perturbation. The device outputs a voltage from two wires. Since the amplifier that I am trying to record the voltage from can only take <5V, I am using a differential op-amp setup to only output the difference between the two input voltages. The problem is that the device is outputting a pulsed dc. (verified using an oscilloscope). The trigger events result in pulses that are higher voltage. The amplifier reads triggers as an input voltage or voltage change. So when I plug the circuit and device into the amplifier, I get trigger events at every single pulse (both the low constant voltage pulses and the actual trigger higher voltage pulses).
I figure that if I google solutions long enough I will get something, but I thought I'd ask you guys for some help. I'm aware of reservoir capacitors but they do not completely smooth the signal, so I fear that there will still be trigger events occurring at each pulsed dc still. I'm thinking of combining the capacitor and a relay to open and close the circuit at the larger trigger event. I think that the relays work based on larger shifts in voltage and so the capacitor will smooth out the pulsed DC and then only the larger triggers will be represented. Since my analysis relies heavily on the timing of the events, I was wondering if the capacitor will affect my timing.
I'm really just looking for any and all ideas here. Thank you in advance!
I figure that if I google solutions long enough I will get something, but I thought I'd ask you guys for some help. I'm aware of reservoir capacitors but they do not completely smooth the signal, so I fear that there will still be trigger events occurring at each pulsed dc still. I'm thinking of combining the capacitor and a relay to open and close the circuit at the larger trigger event. I think that the relays work based on larger shifts in voltage and so the capacitor will smooth out the pulsed DC and then only the larger triggers will be represented. Since my analysis relies heavily on the timing of the events, I was wondering if the capacitor will affect my timing.
I'm really just looking for any and all ideas here. Thank you in advance!