Distributed sensing system based on weak Bragg reflection structure

A technology with weak Bragg and reflection structure, applied in the field of sensing, can solve the problems of inability to distinguish the specific location of over-temperature, system multiplexing capacity limitation, multiplexing number bandwidth limitation, etc., so as to improve the capacity of the sensing system and the sensing distance. , high real-time, reliable performance

Inactive Publication Date: 2011-06-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, a major problem faced by FBG-based distributed sensing is that the multiplexing capacity of the system is limited by the bandwidth of the light source and the filter. Generally, an array can only multiplex about 15 gratings. is not enough
Therefore, the research on fiber grating multiplexing technology has received widespread attention. This method solves the problem

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  • Distributed sensing system based on weak Bragg reflection structure
  • Distributed sensing system based on weak Bragg reflection structure
  • Distributed sensing system based on weak Bragg reflection structure

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Embodiment Construction

[0019] The invention provides a distributed sensing alarm method and system based on weak Bragg reflection periodic structure optical fiber.

[0020] The invention engraves a series of identical weak Bragg reflection structures (WBRS) on the long-distance optical fiber as the sensing unit of the system. The first WBRS is the reference unit ( figure 1 11 in ), placed in a protective device with a constant environment, its central wavelength is used as a reference wavelength, and the central wavelength of other WBRS is used as a standard to judge the wavelength drift. The sampled grating distributed Bragg reflection (SG-DBR) tunable laser is used as the system light source, driven by the wavelength tuning control circuit, and the programmed output wavelength changes according to the set channel interval and conversion rate. SG-DBR is a current injection laser, which can achieve high tuning performance: tuning bandwidth is 30nm, channel spacing is 1pm, wavelength conversion time...

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Abstract

The invention discloses a distributed sensing system based on a weak Bragg reflection structure. The distributed sensing system comprises a SG-DBR (Screen Grid-Distributed Bragg Reflector) tunable laser (1), an electrooptic modulator (4), an opto-isolator (5), an optical circulator (6), and weak Bragg reflection cycle structural optical fibers (7), which are connected in turn; wherein the SG-DBR tunable laser (1) is controlled by a wavelength tuning control circuit (2), the electrooptic modulator (4) is controlled by an impulse function generator (3), a photo-detector (8) is connected with the optical circulator (6), control signals outputted by the wavelength tuning control circuit (2) and the electrooptic modulator (4) and electric signals outputted by the photo-detector (8) enter a data acquisition card (9) jointly, and are processed and then transmitted to a data processing device (10). The distributed sensing system realizes the long-distance distributed sensing alarm for parameters such as temperature, stress and vibration, and has the characteristics of higher detection sensitivity and positioning precision, easiness for realization, lower cost and reliability for operation.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to the application of weak Bragg reflection periodic structure optical fiber in distributed sensing. Based on the continuous backscattering effect and wavelength modulation sensing characteristics of distributed optical fibers, it combines the innovative technology of "Optical Wavelength Time Domain Reflectometry (OWTDR)" for parameter detection and positioning, and obtains the spatial field distribution of the parameters to be measured along the optical fiber. Distributed sensing and alarm system based on weak Bragg reflection structured optical fiber. Background technique [0002] The intelligence of materials and structures is a challenging topic in the 21st century. The use of intelligent structure analysis to monitor engineering structure damage and evaluate the working status of high-risk equipment is of great significance to prevent catastrophic accidents and protect the sa...

Claims

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Application Information

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IPC IPC(8): G01D5/353
Inventor 孙琪真刘德明王梓沃江海张满亮李晓磊
Owner HUAZHONG UNIV OF SCI & TECH
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