Patent ID: 8139905
Filing Date: 2012-03-20
Classification: G01K,G02B,H04J

Abstract:
1. A system, comprising: at least one temperature sensor, each temperature sensor comprising: a laser source coupled to each temperature sensor to input light into the optical fiber, the laser source configured to output the unique wavelength of each twin-grating structure formed on the optical fiber; for each temperature sensor, an optical detector coupled to the optical fiber, wherein when the laser source outputs the unique wavelength of a twin-grating structure formed on the optical fiber, the optical detector receives the optical interference fringe signal to generate a corresponding electrical interference fringe signal; and a processor coupled to the optical detector of each temperature sensor, the processor programmed to, for each twin-grating-structure of each temperature sensor, extract a target fringe of the optical interference fringe signal based on a digital representation of the electrical interference fringe signal and track variation in a phase of the target fringe over time to determine variation in the temperature.