Difference Between FBG and PZT Acoustic Emission Sensor

Dong, Xinyong; Peng, Wei; Cheng-gui, LI

doi:10.1007/978-3-030-12111-2_3

Cited by 1 publication

(1 citation statement)

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“…To avoid such a mismatch, one alternative solution is to adhere the ordinary lighttransmitting optical fiber to the surface of the object to be monitored to receive and transmit elastic waves to the sensing FBG, ensuring that the sensing FBG does not contact the object [14][15][16][17].The modal composition in the sensing fiber may be influenced by the material properties and geometry of the fiber and its coating [16]. Another alternative solution is to use dual FBGs: one for sensing, and the other for compensation [18][19][20][21]. Dual FBGs can effectively compensate for the center wavelength shift caused by environmental temperature changes, but cannot compensate for the center wavelength changes caused by structural deformation or FBG adhering stress.…”

Section: Introductionmentioning

confidence: 99%

Broadband elastic wave detection based on dual FBGs capable of automatically matching the spectra

Fu¹,

Cui²,

Li³

et al. 2021

Meas. Sci. Technol.

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Fiber Bragg grating (FBG)-based sensors can be used to detect middle/high frequency elastic waves via intensity demodulation. Temperature change or structural deformation at the location where the sensing FBG is adhered to may shift the FBG spectrum and mismatch the interrogator filter and sensing FBG spectra, leading to sensing failure. This paper proposes a broadband elastic wave measurement system with a trackable work point based on dual FBGs together with a piezoelectric transducer (PZT), wherein one FBG is pasted on the PZT as a filter and tracker. By applying AC + DC excitation to the PZT and sweeping the DC bias, the two FBGs’ spectra are autonomously matched by searching the max amplitude of the receiving AC signals to maintain high sensitivity. It is experimentally demonstrated that the proposed system can detect up to 500 kHz broadband elastic waves. The proposed system is replicated to produce four sets that are successfully used to detect and locate the impact on an aluminum plate.

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