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Ultrasonic sensing using Yb3+/Er3+-codoped distributed feedback fibre grating lasers.

By Chen-Chun Ye and Ralph P. Tatam


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 impac

Topics: Ultrasonic sensing, distributed feedback fibre laser, fibre Bragg grating, Yb3+/Er3+-codoped fibre
Publisher: Institute of Physics
Year: 2005
DOI identifier: 10.1088/0964-1726
OAI identifier:
Provided by: Cranfield CERES

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