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Proceedings ArticleDOI

An adaptive line enhancement technique for Fiber Bragg grating-based acoustic emission sensor

TL;DR: In this paper, an adaptive signal processing technique called Adaptive Line Enhancement with Coherent Accumulation (ALECA) was used for improving the time domain signals captured from a Fiber Bragg grating-based acoustic emission sensor.
Abstract: We report on the use of an adaptive signal processing technique called Adaptive Line Enhancement with Coherent Accumulation (ALECA) for improving the time domain signals captured from a Fiber Bragg grating-based acoustic emission sensor. The acoustic emission sensor is able to detect signals from a few kHz to 1 MHz with a sensitivity of 1 micro strain. We demonstrate the usefulness of ALECA for extracting the time domain signals from standard ball drop tests.
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Proceedings ArticleDOI
02 Jun 2014
TL;DR: In this paper, a highly sensitive fiber optical acoustic emission (AE) sensor and a parameter analysis method aiming at concrete structure health monitoring is introduced. And the results indicate that DFB-FLAES can be used as sensitive transducers for recording acoustic events and forecasting the imminent failure of the concrete beam.
Abstract: This paper introduces a highly-sensitive fiber optical acoustic emission (AE) sensor and a parameter analysis method aiming at concrete structure health monitoring. Distributed feedback fiber-laser (DFB-FL), which is encapsulated to have a high acoustic sensitivity, is used for sensor unit of the AE sensor. The AE signal of concrete beam in different work stages, based on the four-point bending experiment of the concrete beam, is picked up, and the relationship between the concrete beam work stages and the AE parameter is found. The results indicate that DFB-FLAES can be used as sensitive transducers for recording acoustic events and forecasting the imminent failure of the concrete beam.

1 citations


Cites background from "An adaptive line enhancement techni..."

  • ...And its performance is restricted by many aspects compared to fiber optical AE sensor (FOAEs) [1]....

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References
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Journal ArticleDOI

336 citations


"An adaptive line enhancement techni..." refers methods in this paper

  • ...Adaptive Line Enhancer (ALE) is used to detect sinusoidal signals buried in white noise [4]....

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Journal ArticleDOI
TL;DR: In this paper, the steady-state behavior of the adaptive line enhancer (ALE) is analyzed for a stationary input consisting of multiple sinusoids in white noise, and it is shown that the expected values of the ALE weights in steady state can be written as a sum of sinusoid and that the amplitude of each susoid is coupled to that of all other susoids by coefficients that approach zero as the number of ALE weights becomes large.
Abstract: The steady-state behavior of the adaptive line enhancer (ALE), a new implementation of adaptive filtering that has application in detecting and tracking narrow-band signals in broad-band noise, is analyzed for a stationary input consisting of multiple sinusoids in white noise. It is shown that the steady-state performance of an L-weight ALE for this case can be modeled by the L × L Wiener-Hopf matrix equation and that this matrix equation can be transformed into a set of 2N coupled linear equations, where N is the number of sinusoids. It is also shown that the expected values of the ALE weights in steady state can be written as a sum of sinusoids and that the amplitude of each sinusoid is coupled to that of all other sinusoids by coefficients that approach zero as the number of ALE weights becomes large. The analytical results are compared to experimental results obtained with a hardware implementation of the ALE of variable length (up to 256 weights) and show good agreement. Theoretical expressions for linear predictive spectral estimates are also derived for multiple sinusoids in white noise. Comparisons are made between the magnitude of the discrete Fourier transform of the ALE weights and the linear predictive spectral estimate for two sinusoids in white noise.

223 citations

Journal ArticleDOI
TL;DR: In this article, a fiber Bragg grating acoustic emission sensor head is developed for mechanical tests, which possesses a wider temperature operating region, capability of pure acoustic emission detection and mobility.

61 citations

Journal ArticleDOI
TL;DR: In this paper, the performance analysis of the adaptive line enhancer when the input signal consists of multiple sinusoids embedded in noise is investigated and it is shown that this gain is not only a function of the filter length, but also of three additional factors -- the number of Sinusoids, the noise power, and the amplitude of each sinusoid.

12 citations

Journal ArticleDOI
TL;DR: In this paper, an adaptive line enhancement (ALE) system for improving sensor response using a variable step-size affine-projection algorithm (VSS APA) is presented. But, the performance of the proposed algorithm is limited by the learning process of the adaptive algorithm fails to respond quickly enough to the changing operational conditions.
Abstract: This paper presents design of an adaptive line enhancement (ALE) system for improving sensor response using a variable step-size affine-projection algorithm (VSS APA). ALE is an adaptive technique that may be used to detect a periodic signal buried in a broadband noise background such as in rotating machinery fault diagnosis. However, most of the conventional methods for ALE system are based primarily on an adaptive filter with the least-mean-square (LMS) error algorithm. Unfortunately, convergence speed is limited when a filtering plant is varied, because the learning process of the adaptive algorithm fails to respond quickly enough to the changing operational conditions. This study proposed a VSS APA for improving both the convergence speed and the performance of the ALE system. Two applications were conducted to compare the performance of the proposed algorithm and various traditional adaptive filtering algorithms. The first application used the proposed ALE system to improve the response of a wheel speed sensor output signal; the other was used for reducing the background noise during rotating machinery fault diagnosis. Both the experimental results indicated that the ALE with VSS APA has an effective performance and convergence for both applications.

7 citations