Abstract
We report a highly sensitive fiber-optic sensor based on two cascaded intrinsic fiber Fabry-Perot interferometers (IFFPIs). The cascaded IFFPIs have different free spectral ranges (FSRs) and are formed by a short section of hollow core photonic crystal fiber sandwiched by two single mode fibers. With the superposition of reflective spectrum with different FSRs, the Vernier effect will be generated in the proposed sensor and we found that the strain sensitivity of the proposed sensor can be improved from 1.6 pm/με for a single IFFPI sensor to 47.14 pm/με by employing the Vernier effect. The sensor embed with a metglas ribbon can be also used to measure the magnetic field according to the similar principle. The sensitivity of the magnetic field measurement is achieved to be 71.57 pm/Oe that is significantly larger than the 2.5 pm/Oe for a single IFFPI sensor.
Highlights
In the past few decades, the intrinsic fiber Fabry-Perot interferometers (IFFPIs) sensor have been widely studied for their physical, chemical and biological sensing applications, such as temperature, strain, and refractive index (RI), due to their simple and compact structure, good stability, and high resolution
We report a highly sensitive fiber-optic sensor based on two cascaded intrinsic fiber Fabry-Perot interferometers (IFFPIs)
The cascaded IFFPIs have different free spectral ranges (FSRs) and are formed by a short section of hollow core photonic crystal fiber sandwiched by two single mode fibers
Summary
In the past few decades, the intrinsic fiber Fabry-Perot interferometers (IFFPIs) sensor have been widely studied for their physical, chemical and biological sensing applications, such as temperature, strain, and refractive index (RI), due to their simple and compact structure, good stability, and high resolution. We propose a fiber-optic sensor based on two cascaded IFFPIs with different FSRs. One of the two IFFPIs is fixed on a micro-moving platform as the sensing head for strain measurement or a piece of metglas ribbon for magnetic field measurement, and the other one is free to form a reference IFFPI. One of the two IFFPIs is fixed on a micro-moving platform as the sensing head for strain measurement or a piece of metglas ribbon for magnetic field measurement, and the other one is free to form a reference IFFPI Due to their different FSRs, the reflection spectrum of the proposed sensor will have a major dip and some minor dips. We introduce a curve fitting method for realizing a continuous measurement of strain or magnetic field In this way, we have established a fiber-optic sensor with a high sensitivity that is many times higher than that of a single IFFPI sensor
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