Temperature–Magnetic Field Dual-Parameter Sensor Based on Circular Lattice Photonic Crystal Fiber

This paper proposed and investigated a sensor that could simultaneously measure temperature magnetic fields. The key component of this was photonic crystal fiber with length only 1 cm, whose air holes were arranged in circular lattice symmetry. In order to increase the birefringence fiber, we introduced well-designed point defects into lattice. deficient pores filled magneto-fluidic material (MF) sensed fields through changes its refractive index. outer layer cladding coated thin film Indium tin oxide (ITO), which direct contact ethanol. surface plasmon resonance created by ITO used achieve dual-parameter demodulation solve cross-sensitivity problem. other optical components made up Sagnac interferometer, transmission spectrum interference. At same time, loss due measured. variation field directly related shift wavelengths spectra, thus enabling simultaneous measurements. We sensing performance numerically. results showed wavelength sensitivity 7.6 nm/°C 0.75 nm/mT, resolution 1.316 × 10−3 °C 1.333 mT for field, respectively. Compared sensors, is cm length, makes it compact easy manufacture. geometric parameters, such as position radius pores, are less likely deviate from ideal values, helps reduce impact manufacturing tolerances on performance.