Detecting velocity in a specific threshold
yes if its outside a range


If you need to detect whether a signal is outside a range you need a window comparator like this: -



It uses (or can use) two op-amps where one op-amp detects a high threshold and the other op-amp detects a low threshold. If the signal is between the two thresholds you get a logic 1 output and if it's outside the range then you get a logic zero.

This would need to be triplicated for three sensors and you could use a three input OR gate (for example) to detect the situation where all three signals are outside their specific range.