Long-distance and wide-measurement-range rapid demodulation device and method

A technology of demodulation device and demodulation method, which is applied in the direction of measuring device, measuring heat, and using optical device to transmit sensing components, etc., which can solve the problems of slow demodulation speed, etc.

Active Publication Date: 2021-09-10
ANSHAN REALPHOTONICS TECH CO LTD +1
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Problems solved by technology

[0005] In this context, the embodiment of the present invention expects to provide a long-distance, wide-range fast demodulation device and method to solve the problem of slow demodulation speed in the long-distance and wide-range temperature measurement of the existing BOTDA system

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  • Long-distance and wide-measurement-range rapid demodulation device and method
  • Long-distance and wide-measurement-range rapid demodulation device and method

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Embodiment Construction

[0026]Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Furthermore, it should be understood that development work, while potentially complex and time-consuming, would nevertheless be a routine undertaking for those skilled in the art having the benefit of the teachings herein.

[0027] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related t...

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Abstract

The invention provides a long-distance and wide-measurement-range rapid demodulation device and method. The device comprises a laser, a first optical fiber coupler, a first electro-optical modulator IM1, a second optical fiber coupler, a delay optical fiber, a third optical fiber coupler, an erbium-doped optical fiber amplifier EDFA, a pulse module, a second electro-optical modulator IM2, an optical isolator, a microwave source module, a first circulator R1, a second circulator R2, a fiber grating filter, a photoelectric detector, an acquisition card and a to-be-tested single-mode fiber. According to the scheme, rapid temperature measurement is achieved through a polarization separation detection technology, and temperature demodulation is achieved through artificial neural network. Meanwhile, the difference pulse is used for improving the spatial resolution by adopting the Brillouin optical time domain analysis technology, and two optical pulses with different pulse widths are also required to be differentiated, and the polarization separation detection technology is used for generating the two optical pulses with different widths at one time to replace the switching of the two pulses, so that the pulse switching time is saved during measurement, and the measurement speed is further improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of optical fiber sensing, and more specifically, embodiments of the present invention relate to a fast demodulation device and method for long distance and wide measurement range. Background technique [0002] Brillouin optical time-domain analysis (BOTDA) can realize long-distance, distributed temperature and strain measurement, and has many advantages such as anti-electromagnetic interference, high temperature resistance, corrosion resistance, safety and reliability, and has been It has been widely used in power cables, oil and gas pipelines, infrastructure health monitoring, fire monitoring and other fields. [0003] Brillouin optical time-domain analysis technology is based on the principle of stimulated Brillouin scattering, and realizes sensing by using the linear relationship between the frequency shift of Brillouin scattered light in the optical fiber, the axial strain of the optical fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/322G01D5/353
CPCG01K11/322G01D5/35364G01D5/353
Inventor 夏猛张自超张宇鹏王本章
Owner ANSHAN REALPHOTONICS TECH CO LTD
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