Patent ID: 11906369
Assignee: KIDDE TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A detection system in an aircraft comprising:
an optical fiber arranged along a structure of the aircraft and affixed to the structure with clamps that are spaced apart along the structure, wherein the optical fiber includes two or more sets of fiber Bragg gratings (FBGs);
a light source configured to generate light with two or more wavelengths for injection into the optical fiber; and
processing circuitry configured to identify an overheat condition and monitor vibration experienced by the optical fiber based on reflected signals generated by the two or more sets of FBGs, wherein integrity of the clamps is indicated by monitoring the vibration;
wherein each of the two or more FBGs of the optical fiber has a different grating pitch than others of the two or more FBGs and generates the reflected signals with a different reflected wavelength than the others of the two or more FBGs; and
wherein the overheat condition and the vibration cause a shift in the reflected wavelength of the reflected signals produced by affected ones of the two or more FBGs, the shift being periodic over a predefined duration when based on the vibration and the shift being non-periodic over the predefined duration when based on the overheat condition.