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首页> 美国卫生研究院文献>Journal of Applied Physics >A new fiber-optic non-contact compact laser-ultrasound scanner for fast non-destructive testing and evaluation of aircraft composites
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A new fiber-optic non-contact compact laser-ultrasound scanner for fast non-destructive testing and evaluation of aircraft composites

机译：新型光纤非接触式紧凑型激光超声扫描仪可对飞机复合材料进行快速无损检测和评估

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Laser ultrasonic (LU) inspection represents an attractive, non-contact method to evaluate composite materials. Current non-contact systems, however, have relatively low sensitivity compared to contact piezoelectric detection. They are also difficult to adjust, very expensive, and strongly influenced by environmental noise. Here, we demonstrate that most of these drawbacks can be eliminated by combining a new generation of compact, inexpensive fiber lasers with new developments in fiber telecommunication optics and an optimally designed balanced probe scheme. In particular, a new type of a balanced fiber-optic Sagnac interferometer is presented as part of an all-optical LU pump-probe system for non-destructive testing and evaluation of aircraft composites. The performance of the LU system is demonstrated on a composite sample with known defects. Wide-band ultrasound probe signals are generated directly at the sample surface with a pulsed fiber laser delivering nanosecond laser pulses at a repetition rate up to 76 kHz rate with a pulse energy of 0.6 mJ. A balanced fiber-optic Sagnac interferometer is employed to detect pressure signals at the same point on the composite surface. A- and B-scans obtained with the Sagnac interferometer are compared to those made with a contact wide-band polyvinylidene fluoride transducer.
机译：激光超声（LU）检查代表了一种有吸引力的，非接触式的方法来评估复合材料。但是，当前的非接触式系统与接触式压电检测相比具有相对较低的灵敏度。它们也难以调整，非常昂贵并且受到环境噪声的强烈影响。在这里，我们证明，通过将新一代紧凑，廉价的光纤激光器与光纤通信光学的新发展以及优化设计的平衡探头方案相结合，可以消除大多数这些缺点。特别是，提出了一种新型的平衡Sagnac光纤干涉仪，作为全光学LU泵浦探针系统的一部分，可对飞机复合材料进行无损检测和评估。 LU系统的性能在具有已知缺陷的复合样品上得到了证明。宽带超声探头信号是通过脉冲光纤激光器直接在样品表面产生的，该光纤激光器以高达76petitionkHz的重复频率和0.6 mJ的脉冲能量提供纳秒级的激光脉冲。平衡的Sagnac光纤干涉仪用于检测复合材料表面同一点上的压力信号。将使用Sagnac干涉仪获得的A扫描和B扫描与使用接触式宽带聚偏二氟乙烯传感器进行的A扫描和B扫描进行比较。

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