Optical fiber sensor for measuring hydrogen gas concentration

Abstract

The invention discloses an optical fiber sensor for measuring relative humidity in air, and relates to an optical fiber sensor for measuring hydrogen gas concentration. The optical fiber sensor is characterized by comprising an LED (light-emitting diode) light source, an optical fiber bundle, a photoelectric detector, a computer, a closed gas chamber, a gas chamber, an air bottle, a hydrogen gas bottle, a nitrogen gas bottle, a first platinum (Pt) / WO3 film and a second platinum (Pt) / WO3 film, wherein the gas chamber contains a gas inlet and a gas outlet; and the optical fiber bundle is divided into five ports, namely a first port, a second port, a third port, a fourth port and a fifth port. Tungsten trioxide is generated through a film growing method, reversible chemical reaction can be produced between the substance and hydrogen gas, and platinum is used as a positive catalyst for the chemical reaction to generate a dark blue compound. The compound has the characteristic of selective spectral absorption, and the compounding strength of the hydrogen gas and the tungsten trioxide is detected through the photoelectric detector, so that the low-concentration hydrogen gas can be effectively and quickly detected on the basis of this feature.

Description

technical field [0001] The invention provides an optical fiber sensor for measuring hydrogen concentration, which belongs to the technical field of optical fiber sensing. Background technique [0002] The detection of hydrogen concentration has great application fields, such as industrial manufacturing, metallurgy, and aerospace, so it has attracted many people to study this technology. In traditional hydrogen sensing, electrochemical methods are used to detect hydrogen. Because this technology can provide good accuracy and stability, but in some special environments, such as electromagnetic fields and strong corrosion environments, it is not as stable as the data measured by optical fiber hydrogen sensors. [0003] Palladium (Pd) has good optical constants in hydrogen, and this metal film is very sensitive to physical deformation when absorbing and adsorbing hydrogen, such as impact, bubbling, and delamination. When metal palladium is doped with other elements, such as nic...

AI Technical Summary

Problems solved by technology

When metal palladium is doped with other elements, such as nickel and gold, the sensitivity of this physical deformation will be reduced. In the sensor with palladium-nickel alloy coating on the surface of the fiber Bragg grating structure, hydrogen gas can be detected, due to the fiber Bragg grating structure. Gratings are very fragile, making them difficult to use in practice

Images