System and method for the quasi-distributed measurement of a measured variable

摘要

Method for determining at least one measured variable by means of a sensor fiber, comprising the steps of: (a) providing at least one sensor fiber which has n, where n ≥ 1, predetermined positions (zr) each having a sensor which detects the at least one measured variable by means of a change in the detected at the sensor reflected light power; (b) providing a reference transmission function (H0, Hr) of the sensor fiber, wherein the reference transfer function (H0, Hr) has been determined in a predetermined initial state of the sensor fiber; (c) performing m n optical frequency domain reflectometry measurements at m different measuring frequencies (fk) for determining m Meßübertragungsfunktionen (Mk); (d) determining a change in the reflected light power at at least one sensor position based on the reference transfer function (H0, Hr) and the Meßübertragungsfunktionen (Mk); and (e) determining at least one measured value of the measured variable at at least one sensor position on the basis of the determined change in the reflected light power at the sensor position.