PCF (Pohotonic Crystal Fiber)-SPR (Surface Plasma Resonance) structure sensor capable of simultaneously measuring hydrogen and methane

Abstract

The invention discloses a PCF (Pohotonic Crystal Fiber)-SPR (Surface Plasma Resonance) structure sensor capable of simultaneously measuring hydrogen and methane. The PCF-SPR structure sensor is composed of a broadband light source, an optical attenuator, an air chamber, a PCF-SPR sensor and a spectrograph. Small air holes with a diameter of 1.5 microns are arranged at an angle of 45 degrees and 135 degrees on the cross section of the PCF-SPR sensor, and four ultra-large air holes with a diameter of 5 microns are vertically and horizontally distributed on the cross section of the PCF-SPR sensor, wherein the inner surfaces of the two ultra-large side holes are respectively coated with a hydrogen-sensitive film made of gold and a palladium-WO3 composite film, and a methane sensitive film madeof gold and an ultraviolet light curing fluorosilicone nano film. A gas sensing channel causes different peak shifts at different wavelengths; through structural parameter optimization, a gas mixtureof methane and hydrogen can be accurately measured by combining a side hole structure and polarization filtering without interfering with each other; and the PCF-SPR structure sensor has good multi-channel gas sensing repeatability, and a selective detection method can be applied to gases and other sensing applications, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a PCF-SPR sensor capable of simultaneously measuring hydrogen and methane. Background technique [0002] In order to realize the sustainable development of the energy environment, the government vigorously promotes the clean heating work of "coal-to-gas" in winter in the northern region. people's attention. Due to factors such as pipeline aging, corrosion, and defects, natural gas pipeline leakage accidents often occur. Methane is the main component of natural gas and coal-bed methane. It is a flammable and explosive gas. Methane leakage may threaten people's lives and property, causing Therefore, the development of intelligent, digital and miniaturized methane sensors is the top priority in the monitoring and detection of methane concentration. [0003] Hydrogen is an efficient and clean fuel with the potential to be infinitely recyclable. Due to the small size of hydrogen molecules, s...

AI Technical Summary

Problems solved by technology

The current measurement principle is mainly based on optical absorption spectroscopy technology, the biggest challenge is how to obtain higher relative sensitivity and lower cost loss

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