Fast Hydrogen Detection via Optical Fibers Coated with Metal Hydride Thin Films

Area of Science:

• Materials Science
• Optical Engineering
• Chemical Engineering

Background:

• Widespread adoption of hydrogen (H2) as a clean energy source necessitates robust leak detection systems.
• Current sensing solutions face challenges in cost, scalability, and speed, posing safety risks.
• Optical sensing methods offer a promising alternative by eliminating ignition risks associated with electronics at the detection point.

Purpose of the Study:

• To develop a low-cost, scalable optical sensing device for rapid hydrogen leak detection.
• To leverage the unique properties of magnesium thin films upon hydrogenation for sensing applications.
• To create a complete interrogation unit suitable for widespread deployment in hydrogen infrastructure.

Main Methods:

• Fabrication of a micro-mirror device utilizing single-mode fibers.
• Employing magnesium thin films as the hydrogen-sensitive element.
• Development of a complete optical interrogation unit with industry-standard components.

Main Results:

• Demonstration of a micro-mirror sensor capable of detecting hydrogen (H2).
• Achieved hydrogen loading times (t10 and t90) of 1.2 s and 3.0 s, respectively.
• Successful development of an interrogation unit for practical deployment.

Conclusions:

• The developed optical micro-mirror sensor offers a fast and reliable solution for hydrogen leak detection.
• The use of magnesium thin films provides a significant optical response for sensitive H2 detection.
• The system is designed for scalability and integration into existing infrastructure, promoting safe hydrogen energy usage.