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

Claim 8:
9. A distributed acoustic sensing (DAS) system comprising:
an interrogator;
a proximal circulator connected to the interrogator by a first fiber optic cable;
a downhole fiber connected to the proximal circulator;
an amplifier disposed on the first fiber optic cable;
one or more piezoelectric (PZT) devices attached to the first fiber optic cable;
a pump laser directly connected to the amplifier;
a second fiber optic cable that connects the proximal circulator to the interrogator;
a second amplifier disposed on the second fiber optic cable; and
the second amplifier is connected to the amplifier by a third fiber optic cable.