Patent ID: 8991256
Filing Date: 2015-03-31
Classification: G01F,G01H,G01P

Abstract:
1. A method for determining a speed of a signal species in at least one of a first and a second layer of a multi-layer medium, comprising: transmitting a first signal across a first known distance through the first and second layers; determining a time of flight of the first signal travelling across the first known distance; transmitting a second signal across a second known distance through the first and second layers, the second signal being of the same signal species as the first signal, and wherein the second known distance differs from the first known distance; determining a time of flight of the second signal travelling across the second known distance; and evaluating, using at least one processor, the speed of the signal species through at least one of the first and second layers by using the time of flight of the first and second signals and the first and second known distances.