Acoustic emission positioning system and method based on FBG sensing system and second order statistic

A second-order statistics, sensing system technology, applied in the field of acoustic emission positioning system, can solve the problems of difficult extraction of training samples, low economy, and a large number of training samples.

Active Publication Date: 2015-12-02
SHANDONG UNIV
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Problems solved by technology

Triangulation positioning method and hyperbolic positioning method need to extract accurate time difference for positioning, but due to the dispersion characteristics of acoustic emission signals, it is difficult to extract accurate time difference
Artificial

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  • Acoustic emission positioning system and method based on FBG sensing system and second order statistic
  • Acoustic emission positioning system and method based on FBG sensing system and second order statistic
  • Acoustic emission positioning system and method based on FBG sensing system and second order statistic

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Embodiment Construction

[0073] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0074] In order to better illustrate the specific implementation steps of the second-order statistical root-music acoustic emission positioning based on the fiber grating array, the specific implementation process is described here on the aluminum alloy plate.

[0075] 1. System Settings

[0076] The size of the aluminum alloy plate is 500mm×500mm×2mm, such as figure 1 As shown, a 400mm×400mm monitoring area is set in the board, 7 high-sensitivity fiber grating sensors are pasted under the area, and the middle sensor is set as the reference sensor. The reflection wavelength of the fiber grating sensor is 1534.995nm (this wavelength is on the edge of the largest slope of the unflattened ASE light source, which makes the system have higher demodulation sensitivity). The gate length is 10mm. The center wavelength difference between each sensor after pas...

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Abstract

The invention discloses an acoustic emission positioning system and method based on an FBG sensing system and second order statistic. The positioning method comprises the steps that broadband light emitted by an ASE light source which is not flattened is transmitted to respectively corresponding FBG sensors after sequentially passing through an edge filter, a first coupler and a plurality of second couplers which are arranged in parallel; the FBG sensors reflect back light at the set wavelength, the light is transmitted to a photoelectric conversion circuit through the second couplers and is transmitted to a data collection system through an amplifier, and the data collection system records signal changes; an acoustic emission source produces high-frequency dynamic stress waves, the reflection wavelength of the FBG sensors changes, and demodulation of acoustic emission signals is achieved through the power change of the light reflected by the FBG sensors; the acoustic emission signals obtained through demodulation are subjected to Shannon wavelet transformation, and narrow-band signals are extracted; the azimuth angle and the distance of the acoustic emission source relative to a reference sensor are figured out according to the second order statistic, and then the position of the acoustic emission source is determined. The positioning method has good acoustic emission positioning accuracy and real-time performance.

Description

technical field [0001] The invention relates to an acoustic emission positioning system and method based on an FBG (Fiber Bragg Grating, fiber Bragg grating) sensing system and second-order statistics. Background technique [0002] With the rapid development of modern industry and the replacement of new products, the society has higher and higher requirements for product quality, structural safety and reliability. The structure of modern industrial equipment tends to be complex and large-scale. Moreover, if the equipment is under high load conditions for a long time, it is easy to cause damage accumulation and a decrease in the bearing capacity of the structure, and even cause structural damage. Therefore, the structural health directly affects social security and economic development. Therefore, real-time monitoring of engineering structures is of great strategic significance, especially for national defense projects, aerospace engineering, ships and civilian equipment. ...

Claims

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Application Information

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IPC IPC(8): G01N29/14
Inventor 姜明顺赛耀樟张法业宋福荣隋青美
Owner SHANDONG UNIV
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