FBG hydrogen sensor for simultaneous measurement of temperature and concentration and preparation method thereof

Abstract

The present invention relates to an optical fiber gas sensor, in particular to a FBG hydrogen sensor for simultaneously measuring temperature and concentration and a preparation method thereof; comprising an optical fiber core, an optical fiber cladding, and an optical fiber protective layer, the optical fiber is provided with not less than A FBG area, the FBG area is provided with a measurement area coaxial with the fiber core, including a length L 1 The temperature measurement area and the length is L 2 Temperature and hydrogen concentration measurement area, the temperature measurement area is composed of fast-corroded FBG, gold film and PTFE film layer arranged sequentially from the inside to the outside; the temperature measurement and hydrogen concentration area is composed of slow-corroded Composed of FBG, polydopamine film layer, hydrogen-sensitive film layer and PTFE film layer, the FBG sensor adopting the technical solution of the present invention has high sensitivity, stable performance and can simultaneously acquire hydrogen concentration and temperature change information online.

Description

technical field [0001] The invention relates to an optical fiber gas sensor, in particular to an FBG hydrogen gas sensor for simultaneously measuring temperature and concentration and a preparation method thereof. Background technique [0002] As an ideal new energy source, hydrogen energy has the lightest weight, high combustion heat, good thermal conductivity, clean combustion process, no pollution, and can be recycled. Hydrogen energy has a wide range of sources, and hydrogen production is not limited by time and region. And other advantages, has been widely used in aerospace, new energy vehicles, semiconductor manufacturing and chemical production and other fields. Although hydrogen energy has many of the above advantages, hydrogen energy has not been widely used on a large scale. The main reason is that there are still many technical bottlenecks in hydrogen energy manufacturing, storage, transportation, and monitoring. The root cause is that the hydrogen molecule has a...

AI Technical Summary

Problems solved by technology

Although there are currently reports of sensors that measure hydrogen concentration and temperature at the same time, it is generally necessary to cascade the FBG sensor with other sensors, which increases the complexity and cost of the sensor and detection system; Sensor reporting for simultaneous measurement of concentration and temperature

In addition, the existing hydrogen concentration sensors generally directly expose the hydrogen-sensitive membrane to the air, and water molecules and dust particles in the air are easy to attach to the surface of the hydrogen-sensitive membrane, contaminating and corroding the sensitive membrane, thereby reducing the sensitivity and stability of the sensor and service life

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