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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/1375

Document Type: Article
Title: Ultrasonic sensing using Yb3+/Er3+-codoped distributed feedback fibre grating lasers.
Authors: Ye, Chen-Chun
Tatam, Ralph P.
Issue Date: 2005
Citation: C-C Ye and R P Tatam; Ultrasonic sensing using Yb3+/Er3+-codoped distributed feedback fibre grating lasers. Smart Materials and Structures 2005, Vol. 14, No. 1, pp170-176
Abstract: Yb3+/Er3+-codoped distributed feedback (YbEr-DFB) fibre grating lasers have been investigated for the detection of ultrasonic Lamb waves generated in an aluminum plate. Two sensor configurations have been investigated. A path length imbalanced readout Mach- Zehnder interferometer was used to measure the laser frequency shift induced by ultrasonic vibration. The resolution to out-of-plane displacement was 3 x10-15 m/Ã Â Hz for a continuous ultrasonic wave at a frequency of 470 kHz. Ultrasonic waves were also detected by directly monitoring the laser output power. This simplified configuration is useful for tone burst AE signals generated by a low energy impact
URI: http://dx.doi.org/10.1088/0964-1726/14/1/016
Appears in Collections:Staff publications - School of Engineering

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