Hello. Your question is not clear. Please explain what you mean by SHM and by "pulse echo method". Are you talking about radar and sonar, for instance?
I'm looking for a good book or other references to use for structural health monitoring with lamb waves. the point is that for signal processing part of this test(SHM) I decided to use the pulse-echo technique to interpret the outputs.
more details are:
I am trying the Non-destructive test to evaluate the crack in a plate by using piezoelectrics as an actuator and as a sensor.
let me know if my explanation make it clear or not.