For locating a touch on a tactile surface belonging to an object, mechanical waves are made to propagate in the object and these mechanical waves are picked up. The present invention uses a die set composed of an upper mold, a lower mold and a shim therebetween, which can be used to form a plurality of coated stripes. Because the sensors have distinguishable resonant frequencies or Q-factors and are located on the end of the same optical fiber, they can be monitored in parallel with little or no optical interference. Each working piston has a head end positioned adjacent to a cylinder head to form a compression chamber and is configured to receive power from an explosion of a compressed volume located within the compression chamber, and to transfer the received power to the connecting rods. The patterns are decompressed as they are clocked through the decompressorPRPG into the scan chains.