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NDT of fiber-reinforced composites with a new fiber-optic pump–probe laser-ultrasound system
- Source :
- Photoacoustics
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Laser-ultrasonics is an attractive and powerful tool for the non-destructive testing and evaluation (NDT&E) of composite materials. Current systems for non-contact detection of ultrasound have relatively low sensitivity compared to contact peizotransducers. They are also expensive, difficult to adjust, and strongly influenced by environmental noise. Moreover, laser-ultrasound (LU) systems typically launch only about 50 firings per second, much slower than the kHz level pulse repetition rate of conventional systems. As demonstrated here, most of these drawbacks can be eliminated by combining a new generation of compact, inexpensive, high repetition rate nanosecond fiber lasers with new developments in fiber telecommunication optics and an optimally designed balanced probe beam detector. In particular, a modified fiber-optic balanced Sagnac interferometer is presented as part of a LU pump–probe system for NDT&E of aircraft composites. The performance of the all-optical system is demonstrated for a number of composite samples with different types and locations of inclusions.
- Subjects :
- Engineering
Optical fiber
business.industry
Fiber-optic pump–probe system
Photoacoustics
Detector
Electrical engineering
Composite materials
Nanosecond
Laser
Optoacoustics
NDT&E
Atomic and Molecular Physics, and Optics
law.invention
Interferometry
Optics
law
Nondestructive testing
Fiber laser
Laser ultrasound
Radiology, Nuclear Medicine and imaging
Fiber
business
Research Article
Subjects
Details
- ISSN :
- 22135979
- Volume :
- 2
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Photoacoustics
- Accession number :
- edsair.doi.dedup.....83c2db49799387bf1c7bf28183ed22bd
- Full Text :
- https://doi.org/10.1016/j.pacs.2014.01.001