2005, Detection of a reflective layer in a random medium using time reversal

We propose a method of detecting a reflective layer in a lay-ered random medium using the time reversal of an acous-tic wave. Comparing the refocused signal with the original probing pulse enables us to detect a change it the medium’s acoustic properties. The depth of the reflector is pinpointed even in the absence of a direct coherent reflection. We present experimental results validating the proposed algorithm. 1