Sensor deployment for distributed acoustic sensing interrogation in subsea applications

A method comprising:

• setting a launch power for a continuous wave (CW) light that emits from a laser;
• receiving the CW light from the laser with a pulser, which form one or more light pulses from the CW light;
• transmitting the one or more light pulses from the laser at a set pulse power into a distributed acoustic system (DAS), wherein the DAS comprises a fiber optical cable disposed in a flowline and a sensor fiber;
• passing a backscatter light created within the fiber optical cable and the sensor fiber through a circulator, wherein the circulator is optically connected to a corresponding optical receiver of a plurality of optical receivers, and wherein the circulator directs the backscatter light to the corresponding optical receiver;
• measuring a signal to noise ratio (SNR) from the backscatter light created within the fiber optical cable and the sensor fiber;
• generating a SNR table that compares the backscatter light from the fiber optical cable to the pulse power and compares the backscatter light form the sensor fiber to the pulse power;
• and
• selecting the pulse power for one or more measurements within the fiber optical cable to the sensor fiber based at least in part on the SNR table.