30 March 2018 Ultrahigh-sensitive multimode interference-based fiber optic liquid-level sensor realized using illuminating zero-order Bessel–Gauss beam
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Optical Engineering, 57(3), 036118 (2018). doi:10.1117/1.OE.57.3.036118
Abstract
A proposal toward the enhancement in the sensitivity of a multimode interference-based fiber optic liquid-level sensor is explored analytically using a zero-order Bessel–Gauss (BG) beam as the input source. The sensor head consists of a suitable length of no-core fiber (NCF) sandwiched between two specialty high-order mode fibers. The coupling efficiency of various order modes inside the sensor structure is assessed using guided-mode propagation analysis and the performance of the proposed sensor has been benchmarked against the conventional sensor using a Gaussian beam. Furthermore, the study has been corroborated using a finite-difference beam propagation method in Lumerical’s Mode Solutions software to investigate the propagation of the zero-order BG beam inside the sensor structure. Based on the simulation outcomes, the proposed scheme yields a maximum absolute sensitivity of up to 3.551  dB  /  mm and a sensing resolution of 2.816  ×  10  −  3  mm through the choice of an appropriate length of NCF at an operating wavelength of 1.55  μm. Owing to this superior sensing performance, the reported sensing technology expedites an avenue to devise a high-performance fiber optic-level sensor that finds profound implication in different physical, biological, and chemical sensing purposes.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ardhendu Saha, Arijit Datta, Surjit Kaman, "Ultrahigh-sensitive multimode interference-based fiber optic liquid-level sensor realized using illuminating zero-order Bessel–Gauss beam," Optical Engineering 57(3), 036118 (30 March 2018). https://doi.org/10.1117/1.OE.57.3.036118 Submission: Received 24 November 2017; Accepted 14 March 2018
Submission: Received 24 November 2017; Accepted 14 March 2018
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