Double-C-type cavity-based sensitive membrane embedded optical fiber hydrogen sensor

Abstract

The invention relates to a double-C-type cavity-based sensitive membrane embedded optical fiber hydrogen sensor. The double-C-type cavity-based sensitive membrane embedded optical fiber hydrogen sensor is characterized by comprising a broadband light source, a spectrum analyzer, a single-mode fiber, a circulator and a double-C-type hydrogen sending head; PDMS (polydimethysiloxane) separates a hollow-core fiber into two C-type cavities, one of the C-type cavity forms an interference structure, and the other C-type cavity is embedded with hydrogen sensitive materials to serve as a sensing area.When the concentration of hydrogen rises, Pt / WO3 power reacts with the hydrogen to produce heat, the volume of a PDMS membrane can be increased to lead to movement of an interference spectrum, so thatby detecting the change in interference wavelength, the concentration of the hydrogen can be detected. The double-C-type cavity-based sensitive membrane embedded optical fiber hydrogen sensor solvesthe shortcomings that existing optical fiber hydrogen sensors are large in sensing area, inappropriate to remove control, prone to leading to falling-off of hydrogen sensing materials and complex to manufacture, and meanwhile, is simple in structure and manufacturing, flexible in operation, compact in sensing structure, small in size and applicable to long-term utilization.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a sensitive membrane embedded optical fiber hydrogen sensor based on double C-type micro-cavities. Background technique [0002] Hydrogen energy is a clean energy with no pollution, large reserves and high calorific value, and it is a permanent strategy to ensure energy security. As a reactant, shielding gas, rotor coolant, clean sustainable energy, etc., hydrogen is widely used in many fields, such as petroleum and chemical industry, physics and engineering, electrical industry, automobile, aerospace. However, due to the very low minimum ignition energy and explosion limit (4%) of hydrogen, there are great safety hazards in the daily storage and use of hydrogen. Therefore, rapid detection of hydrogen storage leakage and accurate measurement of hydrogen concentration (especially below 4% or even lower) are extremely important for the safe use of hydrogen. [0003]...

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Problems solved by technology

[0007] In order to overcome the shortcomings encountered in hydrogen sensors such as large sensing area, unsuitable for long-distance control, easy fall off of hydrogen sensitive materials, and complicated production, the present invention proposes a method that can improve the accuracy and sensitivity of measurement and enhance the combination of hydrogen sensitive membranes. Efficient, compact and easy-to-operate sensitive membrane-embedded fiber optic hydrogen sensor based on double C-shaped microcavities

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