Acoustic emission detection using intensity-modulated DFB fiber laser sensor

Tan Yang; Ying Song; Wentao Zhang; Fang Li

doi:10.3788/COL201614.120602

Journals >Chinese Optics Letters >Volume 14 >Issue 12 >Page 120602 > Article

Chinese Optics Letters
Vol. 14, Issue 12, 120602 (2016)

Acoustic emission detection using intensity-modulated DFB fiber laser sensor

Tan Yang¹, Ying Song¹, Wentao Zhang^2、*, and Fang Li²

Author Affiliations

¹School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

²Optoelectronic System Lab, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

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DOI: 10.3788/COL201614.120602 Cite this Article Set citation alerts

Tan Yang, Ying Song, Wentao Zhang, Fang Li. Acoustic emission detection using intensity-modulated DFB fiber laser sensor[J]. Chinese Optics Letters, 2016, 14(12): 120602 Copy Citation Text

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Abstract

The bonded distributed feedback (DFB) fiber laser (FL) acoustic emission sensor and the intensity response of the DFB-FL to external acoustic emissions are investigated. The dynamic sensitivity of the DFB-FL is calibrated by a referenced piezoelectric receiver. In the DFB-FL we used here, the minimum detectable signal is

2 \times 10^{6} m / s

at 5 kHz. Using wavelet packet technology, the collected signals are analyzed, which confirms that an intensity-modulated DFB-FL sensor can be used to detect acoustic emission signals.

Δ l (t) = l_{0} - \frac{(1 - 2 μ) P_{(t)} l}{E}, Δ n_{(t)} = n_{0} + \frac{n^{3} P_{(t)} (1 - 2 μ) (2 P_{12} + P_{11})}{2 E},

(1)

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{RIN}^{2} (f) = Δ {RI}^{2} (f),

(2)

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M = 20 \times l g (\frac{e}{P}),

(3)

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M_{DFB} = 10 \times l g (\frac{P_{s}}{P}),

(4)

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Tan Yang, Ying Song, Wentao Zhang, Fang Li. Acoustic emission detection using intensity-modulated DFB fiber laser sensor[J]. Chinese Optics Letters, 2016, 14(12): 120602

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