Answer Happy

Problem 1. You have to find a rare gold coin 3 cm in diameter buried below 10 cm concrete floor in a flooded basement (water depth is at least 0.5 m) using ultrasonic technique. Design a test: transducer arrangement/placement, scanning if necessary, transducer parameters, such as frequency, diameter, etc), make a drawing of the test, explain the procedure, choose proper imaging (A, B, or C scan), etc. Make sure that the test design is capable of resolving the coin from rocks and other object separated from the coin at least one coin diameter (3cm). Your solution for this problem must be written (statements must be justified and supported by calculations) in a manner that it can be published as a research paper. It must be typewritten, no handwritten papers will be accepted. Problem 2. Three Acoustic Emission sensors are arranged as shown. For the given four arrival sets, establish the likely location of the source. Assume a 5000 m/s wave speed. 2 m B 2 m TA T. Arrival set 1 2 3 4 15.0 us 17.2 us 28.0 us 4.0 us TB 36.2 us 38.5 us 49.2 us 25.1 us 29.7 us 32.0 us 42.5 us 18.8 us