Hydrogen Sensor Based on A Palladium-Coated Long-Period Fiber Grating Pair

Abstract

We propose a simple hydrogen detection scheme based on a Mach-Zehnder interferometer formed with a pair of palladium-coated long-period fiber gratings (LPGs). Since an LPG pair offered a fine-structured interference fringe in its transmission spectrum, the resolution as a sensor could be appreciably enhanced compared to that of a single LPG. As the palladium layer absorbed hydrogen, the effective refractive indices of the cladding modes were increased so that the interference spectrum was blue-shifted up to 2.3 nm with a wavelength sensitivity of -0.29 nm/min for 4% of hydrogen concentration.

Theoretical investigation into the optimized design of a durable OFSPR hydrogen sensor based on a PdY alloy

“…One noticeable candidate to fulfil this purpose is the optical fibre based sensor. This device has a significant advantage over other sensing types in the absence of potential spark causing electrical configurations at the point of gas detection [1,2]. A specific class of optical fibre (OF) sensors are those based on surface plasmon resonance (SPR) [3].…”

Design and optimization of the optical fiber surface plasmon resonance hydrogen sensor based on wavelength modulation

“…Compared with other types of hydrogen sensor, optical fiber hydrogen sensor is a more promising device used for hydrogen leak detection due to its ability to operate in potentially explosive environments [3] and its advantages of miniaturization, corrosion resistance, anti-electromagnetic interference and low cost. Several types of optical fiber hydrogen sensors (micro mirror [4,5], interferometric [6][7][8], evanescent field [9], fiber Bragg grating [10][11][12] and long period grating [13]) have been already presented. These sensors are generally limited by their response time and their cross sensitivity [3].…”

Development of Respiration Sensors Using Plastic Optical Fiber for Respiratory Monitoring Inside MRI System

“…Optical fiber-based sensors offer numerous advantages over conventional sensors such as absence of electrical interference, fast response time, good flexibility and remote sensing [11][12][13][14][15][16][17]. The use of fiber-optic sensors instead of electrical devices can reduce electro-magnetic disturbance of the magnetic field as well as burning hazard to the patient inside the MRI system.…”