Fiber optic sensing system for grid-based assets
AssigneePalo Alto Research Center Incorporated
InventorsPeter Kiesel, Ajay Raghavan, Todd Karin, Qiushu Chen
Life of this patent
Estimating the term…
Abstract
A sensor system includes a sensor network comprising at least one optical fiber having one or more optical sensors. At least one of the optical sensors is arranged to sense vibration of an electrical device and to produce a time variation in light output in response to the vibration. A detector generates an electrical time domain signal in response to the time variation in light output. An analyzer acquires a snapshot frequency component signal which comprises one or more time varying signals of frequency components of the time domain signal over a data acquisition time period. The analyzer detects a condition of the electrical device based on the snapshot frequency component signal.
Claims14
A sensor system comprising:
- a sensor network comprising at least one optical fiber that includes one or more optical sensors, the optical sensors arranged to sense vibration of an electrical device and to produce a time varying light output in response to the vibration;
- at least one detector configured to generate an electrical time domain signal in response to the time varying light output of at least one optical sensor of the sensor network;
- and
- an analyzer configured to:
- acquire at least one snapshot frequency component signal comprising one or more time varying signals of frequency components of the time domain signal over a data acquisition time period;
- and
- detect a condition of the electrical device based on the snapshot frequency component signal;
- wherein the electrical device is electrically connected to a power grid, and the snapshot frequency component signal includes a frequency of the power grid and one or more harmonics thereof.
A method comprising:
- optically sensing vibration of an electrical device and producing a time variation in light output from at least one optical sensor in response to the vibration;
- generating an electrical time domain vibration signal representing the time variation in light output;
- acquiring at least one snapshot frequency component signal comprising one or more time varying frequency components of the time domain signal over a data acquisition time period;
- and
- detecting a condition of the electrical device based on the snapshot frequency component signal;
- wherein the electrical device is electrically connected to a power grid, and the snapshot frequency component signal includes a frequency of the power grid and one or more harmonics thereof.
A sensor system comprising:
- a sensor network comprising at least one optical fiber including one or more optical sensors, the optical sensors arranged to sense one or more parameters of an electrical device;
- at least one detector configured to generate an electrical time domain signal in response to a time variation in light output of at least one optical sensor of the sensor network;
- an analyzer configured to:
- identify changes in a first parameter of the electrical device based on analysis of the time domain signal of the optical sensor over a first data acquisition period;
- and
- identify changes in a second parameter of the electrical device based on analysis of the time domain signal of the optical sensor over a second data acquisition period that is shorter than the first data acquisition period;
- wherein the analyzer is configured to develop a correlation between two or more different sensed parameter signals and detect a change in the presence or amount of the condition based on a change in the correlation.
A sensor system comprising:
- a sensor network comprising at least one optical fiber including one or more optical sensors, the optical sensors arranged to sense one or more parameters of an electrical device;
- at least one detector configured to generate an electrical time domain signal in response to a time variation in light output of at least one optical sensor of the sensor network;
- an analyzer configured to:
- identify changes in a first parameter of the electrical device based on analysis of the time domain signal of the optical sensor over a first data acquisition period;
- and
- identify changes in a second parameter of the electrical device based on analysis of the time domain signal of the optical sensor over a second data acquisition period that is shorter than the first data acquisition period;
- wherein the analyzer is configured to develop a correlation between vibration signals at different sensing points and detect a change in the presence or amount of the condition based on a change in the correlation.
Dependencies are inferred from the claim text.