Negative curvature hollow core fiber sensor for the measurement of strain and temperature

Three different types of strain and temperature sensors based on negative curvature hollow core fiber (NCHCF) are proposed. Each sensor is produced by splicing a small section the NCHCF between two sections single mode fiber. Different interferometers obtained simply changing conditions. The first consists Fabry-Perot interferometer (FPI). remaining configurations attained with same sensing structure, depending its position in relation to interrogation setup. Thus, double FPI or hybrid sensor, latter being composed an Michelson interferometer, formed. inline submillimeter size, thus enabling nearly punctual measurements.