Sentek Instrument - Model picoDAS - Distributed Acoustic Sensing (DAS) System - Datasheet

Distributed acoustic senasing (DAS) is demanded in many applications. Traditionally, fiber optic DAS systems are based on time domain detection of Rayleigh backscatters produced by a laser pulse in the sensing fiber. Due to the extremely weak nature of the Rayleigh scattering, these systems often have an acoustic detection sensitivity limited to the order of nanostrains, as a measure of the minimum detectable acoustic wave.  In addition, the acoustic measurement often has a poor fidelity, and may even become qualitative only as the sensing distance increases, which further weakens the Rayleigh backscatters.