We propose a real-time multi-monitoring interrogation technique based on Fourier domain mode-locked fiber laser for simultaneous measurement of radiation dose and multi-point strain. Radiation dose and multipoint strain can be monitored in real-time by measuring the variation of output power and detection time interval of the sensing signals. Since the operating wavelength of the FDML is continuously controlled as a function of time, it is possible to simultaneously measure the variation of radiation dose and multipoint strain in real time.
A microfiber-based Mach-Zehnder interferometer (MZI) for measurement of absolute strain is proposed and demonstrated experimentally. The diameter of the microfiber is optimized to induce the negative thermo-optic effect in the microfiber MZI and the temperature sensitivity of the microfiber MZI is successfully suppressed. When the diameter of the microfiber is ~5 μm, the temperature sensitivity of the microfiber-MZI is dramatically mitigated. We apply the proposed microfiber MZI for absolute strain measurement and its strain sensitivity is measured to be ~7.13×10-2 nm/ μЄ.
We propose a novel fiber Bragg grating (FBG) sensor interrogation system using a Raman-based Fourier domain mode
locking (FDML) fiber laser for a high speed and a long distance measurement. To improve transmission efficiency of the
sensing probe signal over a long distance of 20-km, the residual pump powers are recycled. The external strain change
can be measured by detecting the tine interval between two reflected signals from two FBGs as the Rama-based FDML
is swept. The measured strain sensitivities with respect to the time are 0.19 ns/μstrain.
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