Pipe cross-sectional fiber optic multiphase apparatus

A computer implemented method performed by one or more processors for automatically detecting flow rates for different components of a fluid flow, the method comprising the following operations:

• receiving a Brillouin scattering wave from at least one optical fiber extending into a fluid flow, the Brillouin scattering wave generated by a photodetector;
• determining a Brillouin frequency shift using heterodyne detection;
• determining strain and temperature values at one or more locations along the optical fiber;
• determining a flow regime of the fluid flow using a flow regime observer;
• and
• determining the different components of the fluid flow using a quantifier based on the determined strain and temperature values and the determined flow regime.

An apparatus for automatically detecting flow rates for different components of a fluid flow, the apparatus comprising:

• one or more processors;
• and
• a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming instructions for execution by the one or more processors, the programming instructions instruct the one or more processors to:
• generate a laser beam with a continuous wave laser;
• generate a local oscillator signal from a portion of the laser beam with an electro-optic modular;
• detect a Brillouin frequency shift with a photodiode according to heterodyne detection based on a comparison of a Brillouin scattered wave and the local oscillator signal;
• determine strain and temperature values at one or more locations along the optical fiber using one or more interrogators;
• determine a flow regime of the fluid flow using a flow regime observer;
• and
• determine the different components of the fluid flow using a quantifier based on the determined strain and temperature values and the determined flow regime.