Patent ID: 11933664
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Measurement (Instruments)
Classification: CPC G  E  H | IPC E  G  H

Claim 2:
3. A distributed acoustic sensing (DAS) system comprising:
an interrogator comprising:
a first pump laser; and
a second pump laser;

an umbilical line connected to the interrogator and comprising:
a first amplifier connected to the interrogator by a first fiber optic cable and connected to the first pump laser by a third fiber optic cable; and
a second amplifier connected to the interrogator by a second fiber optic cable and connected to the second pump laser by a fourth fiber optic cable;

one or more piezoelectric (PZT) devices attached to the first fiber optic cable or the second fiber optic cable; and
a downhole fiber connected to the umbilical line.