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A Fiber Bragg Grating Sensing Method Applied to Small-Sized Fire Source Monitoring

A fiber bragg grating and sensing method technology, which is applied in electrical fire alarms, optics, light guides, etc., can solve the problems of shortening the interval between adjacent FBGs, and the inability to realize long-distance, large-capacity, and high-density small-size fire source monitoring. , to achieve the effect of avoiding the networking mode, reducing the difficulty of demodulation, and shortening the interval

Active Publication Date: 2021-03-26
WUHAN UNIV OF TECH
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Problems solved by technology

Although the preparation of the sensor network has made a qualitative leap, in the sensor network using TDM technology networking, the demodulation system is always limited by the pulse width of the pulsed optical signal, and it is impossible to shorten the distance between adjacent FBGs in a real sense. It is impossible to realize long-distance, large-capacity and high-density small-sized fire source monitoring

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  • A Fiber Bragg Grating Sensing Method Applied to Small-Sized Fire Source Monitoring
  • A Fiber Bragg Grating Sensing Method Applied to Small-Sized Fire Source Monitoring
  • A Fiber Bragg Grating Sensing Method Applied to Small-Sized Fire Source Monitoring

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Embodiment 1

[0047] The traditional FBG temperature sensing system mainly has two networking methods: one is the networking method based on wavelength division multiplexing (WDM) technology, in which multiple FBGs with strong reflectivity of different wavelengths are welded together in series to form a sensor The interval between the network and FBG can be set arbitrarily according to needs, so it can realize the perception of small-sized fire sources. However, due to the influence of light source bandwidth and welding loss, the number of multiplexes in the system is only a few dozen at most, making it difficult to achieve large-scale and long-distance detection;

[0048] The other is a networking method based on time-division multiplexing (TDM) technology. Multiple FBGs with weak reflectivity of the same wavelength are welded together in series to form a sensor network. Since it is no longer limited by the bandwidth of the light source, the multiplexing of the system The capacity can reac...

Embodiment 2

[0071] On the basis of Embodiment 1, this embodiment establishes different data processing mechanisms according to the characteristics of the overall region spectrum. Before introducing the specific process of the data processing mechanism, first introduce the characteristics of the overall region spectrum. In this embodiment, the characteristics of the overall region spectrum include four characteristics, which are respectively marked as characteristic 1, characteristic 2, characteristic 3 and characteristic 4. The specific description of features 1 to 4 will be introduced in detail below.

[0072] Feature 1 is: when all FBGs in the area are under the same conditions, that is, the central wavelengths of all FBGs in the area change with temperature together, such as figure 2 As shown in (a), the spectra of all FBGs are superimposed into an overall area spectrum. Since all FBGs in the area are identical gratings, the shape of the overall area spectrum is similar to that of a s...

Embodiment 3

[0092] According to the national standard GB16280-2014 "Linear Heat Sensitive Fire Detector", any sensitive part of the detector with a length of 100mm can quickly detect high temperature changes. It can be seen that how to improve the ability of optical fiber fire detection technology to monitor small size (100mm) fire sources is very important in fire prevention work. On the basis of Embodiment 2, this embodiment further explains the fiber grating sensing method applied to small-sized fire source monitoring in this application in combination with an actual case. details as follows:

[0093] Step 1: Continuously write 10,000 FBGs with a reflectivity of -47dB and a central wavelength of 1550nm on a single fiber, such as figure 1 As shown, the interval between FBGs is 10 cm. Since each grating is sensitive to the external environment, the sensor network can sense fire sources as small as 10cm in size. At the same time, the effective detection length of the sensing array is L...

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Abstract

The present invention proposes a fiber grating sensing method applied to small-scale fire source monitoring, which distinguishes the two concepts of spatial resolution and perceptual resolution. On the premise of ensuring the spatial resolution of the traditional FBG sensing system, only Increase the number of FBGs under the coverage of a single pulsed optical signal without changing the pulse width of the pulsed optical signal, thereby improving the perceived resolution of the system without increasing the requirements for hardware circuits, truly shortening the interval between adjacent FBGs, and improving the system performance. The perceptual resolution not only ensures the spatial resolution of the system but also realizes the monitoring of small-sized fire sources; by using a simple feature extraction algorithm to obtain fire temperature information in different areas, the temperature detection speed of the system is fast.

Description

technical field [0001] The invention relates to the technical field of small-scale fire source monitoring, in particular to a fiber grating sensing method applied to small-size fire source monitoring. Background technique [0002] Due to the advantages of anti-electromagnetic interference, anti-corrosion, long detection distance and large multiplexing capacity, the optical fiber sensing temperature measurement technology has replaced the traditional electrical fire detection technology in many fields such as petroleum and petrochemical, electric power, and tunnel traffic, and has become the mainstream. fire detection technology. However, with the development of science and technology, people have a clear understanding of the initiation and development process of fire. Fire detection technology not only needs to be able to realize long-distance and large-scale monitoring, but also needs to monitor the temperature rise intensively along the fire detection line. In this way, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/3206G08B17/00
CPCG01K11/3206G08B17/00G01K1/026G01K2003/145G08B17/06G08B29/185G02B6/02076G08B29/043
Inventor 李政颖王立新王洪海郭会勇姜德生王加琪
Owner WUHAN UNIV OF TECH
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