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Wide-temperature-range demodulation device and method based on low-frequency frequency agility and sliding window

A demodulation device and wide temperature technology, applied in the field of optical fiber, can solve problems such as complex structure, achieve the effect of reducing equipment cost and ensuring reliability

Active Publication Date: 2020-11-27
ANSHAN REALPHOTONICS TECH CO LTD +1
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  • Abstract
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Problems solved by technology

Even if the multi-slope method is used, the maximum temperature measurement range generally does not exceed 300°C, and the structure is more complicated

Method used

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  • Wide-temperature-range demodulation device and method based on low-frequency frequency agility and sliding window
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  • Wide-temperature-range demodulation device and method based on low-frequency frequency agility and sliding window

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Embodiment Construction

[0035] 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.

[0036] 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 ...

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Abstract

The invention provides a wide-temperature-range demodulation device and method based on low-frequency frequency agility and a sliding window. Laser emitted by a laser device is divided into two beamsof laser with the same power through an optical fiber coupler; one beam is modulated into pump light by a first electro-optical modulator driven by an electric pulse signal output by a frequency agility module, and the pump light is amplified by an erbium-doped fiber amplifier and enters a single-mode fiber to be measured; the other beam is modulated into probe light by a second electro-optical modulator driven by a microwave signal output by an up-conversion module, and the probe light is scrambled by a quadrature scrambler and then enters the to-be-measured single-mode optical fiber from theother end of the to-be-measured single-mode optical fiber; pump light and probe light interact in the single-mode optical fiber to be detected to generate a backward stimulated Brillouin scattering signal, a lower sideband light beam filtered by the fiber bragg grating filter is received by a photoelectric detector, and a generated electric signal is acquired by an acquisition card. The low-frequency agility technology is used for achieving rapid temperature demodulation, the response frequency exceeds 1Hz, and meanwhile, the equipment cost can be reduced, and the reliability can be guaranteed.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a wide temperature range demodulation device and method based on low-frequency agility and a sliding window. Background technique [0002] Distributed optical fiber sensor uses optical fiber to sense the external temperature, has the characteristics of anti-electromagnetic interference, high temperature resistance, corrosion resistance, etc., and can be applied to various harsh environments. Brillouin optical time-domain analysis (BOTDA) can simultaneously measure temperature and strain, and has been widely used in power cables, oil and gas pipelines, fire monitoring and other fields. [0003] The Brillouin optical time-domain analysis technology uses the principle that the stimulated Brillouin scattering frequency is linearly related to the temperature change of the fiber to realize the distributed sensing of the fiber temperature. The pump light and probe light incident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 夏猛汤晓惠全栋梁张宇鹏张自超关鹏隋景林
Owner ANSHAN REALPHOTONICS TECH CO LTD
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