Wavelength division multiplexing optical fiber hydrogen sensing system capable of achieving multi-point monitoring

Abstract

The invention discloses a wavelength division multiplexing optical fiber hydrogen sensing system capable of achieving multi-point monitoring. The system comprises a light source, an optical strength modulator, an optical fiber circulator, an optical fiber sensing head, a photoelectric detector and a signal processing unit, wherein dense wavelength division multiplexing devices are arranged between the optical fiber circulator and the optical fiber sensing head and between the optical fiber circulator and the photoelectric detector, and light paths between the two dense wavelength division multiplexing devices correspond to each other. The system solves the difficult problems that the optical fiber hydrogen sensing system both at home and abroad only achieves single-point measurement but cannot monitor large-quantity-count array type or region overlapping type hydrogen of a to-be-monitored object or a to-be-monitored area.

Description

technical field [0001] The invention relates to the field of sensing technology and hydrogen gas monitoring, in particular to a wavelength division multiplexing optical fiber hydrogen sensing system capable of realizing multi-point monitoring. Background technique [0002] With the development of modern industry, hydrogen, as an important industrial raw material, has been widely used in various sectors such as electric power, aerospace, aviation, navigation, chemical industry, etc., but the uncertain leakage of hydrogen may endanger life or damage industrial equipment and all Therefore, how to quickly and accurately measure hydrogen and its concentration online is becoming more and more important. [0003] In many fields, hydrogen and its concentration need to be monitored, and most of them are in complex, dangerous and disturbing environments. In this case, scientists believe that electronic hydrogen sensing systems cannot be used because of their The sensing part is an el...

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Problems solved by technology

[0004] For various applications of hydrogen monitoring, there are requirements for array or area coverage monitoring of a large number of points or areas to be measured, such as in the above-mentioned nuclear power plants, engines of aerospace / aviation vehicles, submarine fuels, power stations In fields such as turbogenerator units, it is necessary to monitor hydrogen on multiple components or at multiple locations. However, in related research at home and abroad, the existing optical fiber hydrogen sensing system can only be used on the object or area to be measured. Single-point measurement in the middle, that is, a set of optical fiber hydrogen sensing system can only realize the hydrogen monitoring of one point, and the measurement of more points needs to be realized through the superposition of multiple sets of optical fiber sensing systems. With the increase of the number of measurement points, the other The complexity, cost, and volume of the entire system have increased significantly, so it is difficult to achieve a large number of points (a few points, a dozen points, or even tens of points) by using the simple stacking method of a conventional optical fiber hydrogen sensing system. Therefore, it is urgent to develop a system that can A new type of optical fiber hydrogen sensing system that realizes the array type or area coverage hydrogen gas monitoring of a large number of points or areas to be measured

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