Patent ID: 11899146
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 0:
1. A method for correcting a phase sensing error, comprising:
receiving at a sensor an optical signal, wherein the optical signal carries at least a first wavelength and a second wavelength;
receiving at a receiving system a reflected waveform from the sensor;
generating a plurality of first quadrature pairs associated with the first wavelength for a plurality of temporal samples of the reflected waveform associated with a location;
determining a first delta phase for each of the plurality of temporal samples of the reflected waveform for the location based, at least in part, on a difference between a first quadrature pair of the plurality of first quadrature pairs associated with a first temporal sample of the plurality of temporal samples and a second quadrature pair of the plurality of first quadrature pairs associated with a second temporal sample of the plurality of temporal samples;
generating a second plurality of quadrature pairs associated with the second wavelength of the plurality of temporal samples of the reflected waveform for the location;
determining a second delta phase for each of the plurality of temporal samples of the reflected waveform for the location based, at least in part, on a difference between a first quadrature pair of the plurality of second quadrature pairs associated with the first temporal sample of the plurality of temporal samples and a second quadrature pair of the plurality of second quadrature pairs associated with the second temporal sample of the plurality of temporal samples;
determining a delta phase difference for each of the plurality of temporal samples of the reflected waveform for the location based, at least in part, on a difference between the first delta phase and the second delta phase;
determining a phase jump of at least one of the first wavelength and the second wavelength based, at least in part, on the delta phase difference;
determining a first average magnitude for each of the plurality of temporal samples associated with the first wavelength;
determining a second average magnitude for each of the plurality of temporal samples associated with the second wavelength;
determining a corrected phase measurement for the location based, at least in part, on the delta phase difference, the first delta phase, the second delta phase, the first average magnitude and the second average magnitude; and
determining that at least one of the first quadrature pair and the second quadrature pair are within a quality region, wherein the quality region extends from at and above a threshold that is at least four times a root mean square (RMS) noise of the sensor; and
applying the corrected phase measurement to the at least one of the first quadrature pair and the second quadrature pair that are within the quality region.