Runtime Measurement
This method uses the timing of reflected signals of a known velocity for measuring lengths. See also the images above.
Read more about this topic: Measuring Principle
Famous quotes containing the word measurement:
“That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
—John Dos Passos (1896–1970)