Patent ID: 8734011
Filing Date: 2014-05-27
Classification: G01K

Abstract:
1. A distributed optical fiber temperature sensor based on optical fiber delay, comprising a tunable optical transmitter module, an optical receiver module, a signal processing and controlling module and multiple distributed sensing modules connected in series via transmission fibers, wherein multiple wavelengths optical signals transmitted from the tunable optical transmitter module respectively are transmitted into a first sensing module via a transmission fiber, and then transmitted out from a last sensing module; the output multiple wavelengths optical signals are transmitted into the optical receiver module via another transmission fiber; the optical receiver module converts optical signals of all wavelengths into electrical signals and transmits them into the signal processing and controlling module; the signal processing and controlling module measures transmission delay time of optical signal of each wavelength respectively, and calculates and obtains the temperature parameters of corresponding distributed testing positions based on the relative delay time, wherein the sensing module comprises a first optical circulator, a second optical circulator, transmission fibers, a sensing fiber and a wavelength selecting unit, wherein the multiple wavelengths optical signals arrive at the first optical circulator, pass through from port