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A novel fiber-laser-based strain sensor is proposed and experimentally demonstrated.The laser cavity is composed of a high-birefringence Sagnac fiber loop mirror (HiBi-SFLM) and a fiber Bragg grating (FBG) which also acts as a strain-sensing element.In the linear region of the HiBi-SFLM reflection spectrum,when the strain applied on the FBG makes the Bragg grating wavelength shift,the laser output power changes due to reflectivity variation of the HiBi-SFLM.Experimental results show that the laser output power varies almost linearly with the applied strain.The measurement of the out put power can be performed by a conventional photo-detector.
A novel fiber-laser-based strain sensor is proposed and experimentally demonstrated. The laser cavity is composed of a high-birefringence Sagnac fiber loop mirror (HiBi-SFLM) and a fiber Bragg grating (FBG) which also acts as a strain-sensing element.In the linear region of the HiBi-SFLM reflection spectrum, when the strain applied on the FBG makes the Bragg grating wavelength shift, the laser output power changes due to reflectivity variation of the HiBi-SFLM. Experimental results show that the laser output power varies almost linearly with the applied strain. The measurement of the out put power can be performed by a conventional photo-detector.