Cycle Skipping
The returning signal is a wavetrain and not a sharp pulse, so the detectors are only activated at a certain signal threshold. Sometimes, both detectors won’t be activated by the same peak (or trough) and the next peak (or trough) wave will activate one of them instead. This type of error is called cycle skipping and is easily identified because the time difference is equal to the time interval between successive pulse cycles.
Read more about this topic: Sonic Logging
Famous quotes containing the words cycle and/or skipping:
“The cycle of the machine is now coming to an end. Man has learned much in the hard discipline and the shrewd, unflinching grasp of practical possibilities that the machine has provided in the last three centuries: but we can no more continue to live in the world of the machine than we could live successfully on the barren surface of the moon.”
—Lewis Mumford (1895–1990)
“What a hero Tom was become now! He did not go skipping and prancing, but moved with a dignified swagger as became a pirate who felt that the public eye was on him.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)