Palladium-nanoparticle dual-optical-path compensation reflective optical fiber hydrogen sensor

Abstract

The invention discloses a palladium-nanoparticle dual-optical-path compensation reflective optical fiber hydrogen sensor comprising a test system, a reference system, a fiber bundle, an LED light source, a photodiode, a data acquisition card and a computer. Testing platforms in the test system and the reference system have the same designed structures and same batches of palladium nanoparticles are coated and deposited. A test chamber is filled with a mixture of hydrogen and nitrogen gas; and the reference system is closed all the time. An optical signal emitted by the LED light source entersthe two systems respectively after the fiber bundle; the signal is reflected back to the fiber bundle by a sensitive film; the photodiode carries out photoelectric signal conversion to obtain an electric signal; a data acquisition card collects the electric signal; and the computer carries out filter processing, compensation operation, and waveform displaying on the signal byusing Lab VIEW. Therefore, the novel idea is provided for improving the stability of the sensor and suppressing the drift.

Description

technical field [0001] The invention belongs to the field of hydrogen sensors, and in particular relates to a dual-optical path compensation reflective optical fiber hydrogen sensor based on palladium-gold nanoparticles. Background technique [0002] With the global environmental pollution, energy shortage and the intensification of the greenhouse effect, hydrogen, as an efficient, clean and renewable secondary energy, is known as the pillar of the energy system in the 21st century. As an important fuel for rocket propulsion, liquid hydrogen has been widely used in the launch of aircraft such as communication satellites, spacecraft, and space shuttles. Since hydrogen has the characteristics of high combustion calorific value and non-polluting combustion products, various primary energy sources such as fossil fuels, solar energy, wind energy, geothermal energy, tidal energy, and nuclear energy can be converted into hydrogen energy, thereby realizing efficient storage and clea...

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Problems solved by technology

[0003] However, hydrogen has a wide explosion range. At normal temperature and pressure, when the hydrogen content in the air is between 4% and 74.5%, it is very easy to cause an explosion; and because hydrogen is the lightest element, the diffusivity of hydrogen It is four times higher than natural gas and twelve times more volatile than gasoline vapor. Once a leak occurs, it will spread quickly, which will seriously threaten the safety of people's lives and property

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