Enhanced sensitivity of transmission based optical fiber hydrogen sensor with multi-layer Pd–Y alloy thin film

A Pd-Ni alloy thin-film coated surface acoustic wave (SAW) device is proposed for sensing hydrogen. The Pd-Ni thin-film was sputtered onto the SAW propagation path of a SAW device with a delay line pattern to build the chip-sized hydrogen sensor. The prepared sensor chip was characterized by employing a differential oscillation loop. The effect of the Pd-Ni film thickness on sensing performance was also evaluated, and optimal parameters were determined, allowing for fast response and high sensitivity. Excellent working stability (detection error of 3.7% in half a year), high sensitivity (21.3 kHz/%), and fast response (less than 10 s) were achieved from the 40 nm Pd-Ni alloy thin-film coated sensing device.

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Optical fiber hydrogen sensor based on an annealing-stimulated Pd–Y thin film

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2015.03.090 ◽

2015 ◽

Vol 216 ◽

pp. 11-16 ◽

Cited By ~ 24

Author(s):

Han Song ◽

Youping Chen ◽

Gang Zhang ◽

Yi Liu ◽

Pengcheng Huang ◽

...

Keyword(s):

Thin Film ◽

Optical Fiber ◽

Hydrogen Sensor

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Characteristics of hetero-core optical fiber hydrogen sensor based on Au/WO3/Pt thin film

10.1109/sensors47087.2021.9639808 ◽

2021 ◽

Author(s):

Yuji Nagao ◽

Koji Yuhashi ◽

Ai Hosoki ◽

Michiko Nishiyama ◽

Shoichi Kubodera ◽

...

Keyword(s):

Thin Film ◽

Optical Fiber ◽

Hydrogen Sensor

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Response of Optical Fiber Bragg Sensors With a Thin Film Shape Memory Alloy Coating

Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1 ◽

10.1115/smasis2008-455 ◽

2008 ◽

Cited By ~ 1

Author(s):

K. P. Mohanchadra ◽

Michael C. Emmons ◽

Sunny Karnani ◽

Gregory P. Carman ◽

W. Lance Richards

Keyword(s):

Thin Film ◽

Shape Memory Alloy ◽

Optical Fiber ◽

Shape Memory ◽

Alloy Coating ◽

Niti Shape Memory Alloy ◽

Alloy Thin Film ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

Transformation Temperatures

This paper describes the sputter deposition and characterization of nickel titanium (NiTi) shape memory alloy thin film onto the surface of an optical fiber Bragg sensor. The NiTi coating uniformity, crystallinity and transformation temperatures are measured using scanning electron microsocopy, x-ray diffraction and differential scanning calorimetry respectively. The strain in the optical fiber is measured using centroid calculation of wavelength shifts. Results show distinct and abrupt changes in the optical fiber signal with the four related transformation temperatures represented by the austenite-martensite forward and reverse phase transformations. These tests demonstrate a coupling present between optical energy and thermal energy, i.e. a modified multiferroic material.

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