Research of unsymmetrical intrinsic Fabry-Perot fiber optic strain sensor

A novel unsymmetrical intrinsic Fabry-Perot fiber optic strain sensor has been developed to improve the measurement of strain for different structures. Sensing principle, structure and sensing characteristics are studied. Some kinds of the unsymmetrical intrinsic Fabry-Perot interferometric (UIFPI) strain sensor are designed and fabricated. Temperature and strain characteristic of these sensors have been tested. The experiments indicate that these UIFPI sensors possessing favorable linear static and dynamic strain characteristic. The temperature characteristics of the UIFPI strain sensors with different carrier materials are distinct and the naked fiber-optic structure sensor is not sensitive to temperature. The experimental results reveal that the sensitivity is also depended on the cavity length of the UIFPI sensor.