Читать книгу Distributed Acoustic Sensing in Geophysics - Группа авторов - Страница 44

The IU sends a pulse of light into the fiber with a sampling rate of 10 kHz or higher. The time between these pulses are set so that the light has time to reach the end of the fiber and return as backscattered energy to the photodetector in the IU. The longer the sensing fiber, the slower this sampling rate should be, so that the pulse of light has the necessary time to return to the IU without interfering with another pulse.