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:
“Oh, life is a glorious cycle of song,
A medley of extemporanea;
And love is a thing that can never go wrong;
And I am Marie of Roumania.”
—Dorothy Parker (1893–1967)
“O mud
For watermelons gutted to the crust,
Mud for the mole-tide harbor, mud for mouse,
Mud for the armored Diesel fishing tubs that thud
A year and a day to wind and tide; the dust
Is on this skipping heart that shakes my house,”
—Robert Lowell (1917–1977)