Based on the microwave photonics filter technique, an FBG array for quasi-distributed strain sensing has been proposed and demonstrated. The kernel of this work is that the strain on the FBG array changes the wavelength of these FBGs, which is converted to the variation of the time delay of the time response of the generated microwave photonic filter. Results show that, there is good measurement linearity between the time delay and applied strain. The proposed scheme enjoys fast interrogation speed and high resolution, hoping to provide a valuable reference in the field of temperature, index refractive and other parameters sensing.
A fiber-optic micro-electromechanical systems (MEMS) extrinsic Fabry-Perot interferometer (EFPI) pressure sensor exploiting microwave photonics filtering technique is firstly proposed and experimentally demonstrated. A single-bandpass microwave photonic filter (MPF) which mainly consists of a spectrum-sliced light source, a pressurized EFPI, a phase modulator (PM) and a length of dispersion compensating fiber (DCF) is demonstrated. The frequency response of the filter with respect to the pressure is studied. By detecting the resonance frequency shifts of the MPF, the pressure can be determined. The theoretical and experimental results show that the proposed EFPI pressure sensor has a higher resolution and higher speed than traditional methods based on optical spectrum analysis. The sensitivity of the sensor is measured to be as high as 86 MHz/MPa in the range of 0-4MPa.
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