FBG STRAIN SENSOR PROBE CAPABLE OF TEMPERATURE COMPENSATION AND SENSING METHOD THEREOF

摘要

The present invention relates to a fiber Bragg grating (FBG) strain sensor probe which uses a bimetal beam to perform temperature compensation by an FBG probe. According to an embodiment of the present invention, the FBG strain sensor probe capable of temperature compensation comprises: a fixed bracket whose lower end is fixed on a target measurement object; a bimetal beam separated from the fixed bracket by a predetermined first distance, whose lower end is fixed on the target measurement object; and an optical fiber wherein one side thereof is installed on a free end of the fixed bracket, the other side thereof is installed on a free end of the bimetal beam, light propagated thereinto, and an FBG is arranged between the one side and the other side thereof to reflect a portion of the light corresponding to a Bragg wavelength. If a temperature changes, the bimetal is deformed, and deformation of the bimetal can prevent the Bragg wavelength from changing according to a change of the temperature.;COPYRIGHT KIPO 2016