A new X-ray backscatter imaging technique for non-destructive testing of aerospace materials

Kolkoori, Sanjeevareddy; Wrobel, Norma; Zscherpel, Uwe; Ewert, Uwe

doi:10.1016/j.ndteint.2014.09.008

Cited by 54 publications

(25 citation statements)

References 15 publications

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“…5 (left) shows the setup of the scatter camera and a comparison of the scatter image (center) and a transmission image (right) of carbon fiber reinforced polymer (CFRP) composite plates with internal stiffening structures and water inclusions. The water and the internal structures are clearly visible [21]. …”

Section: Application Of Twisted Slit Camera For Testing Of Cfrp Compomentioning

confidence: 99%

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A novel multi slit X-ray backscatter camera based on synthetic aperture focusing

Wieder¹,

Ewert²,

Vogel³

et al. 2017

AIP Conference Proceedings

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Abstract.A special slit collimator was developed earlier for fast acquisition of X-ray back scatter images. The design was based on a twisted slit design (ruled surfaces) in a Tungsten block to acquire backscatter images. The comparison with alternative techniques as flying spot and coded aperture pin hole technique could not prove the expected higher contrast sensitivity. In analogy to the coded aperture technique, a novel multi slit camera was designed and tested. Several twisted slits were parallelly arranged in a metal block. The CAD design of different multi-slit cameras was evaluated and optimized by the computer simulation packages aRTist and McRay. The camera projects a set of equal images, one per slit, to the digital detector array, which are overlaying each other. Afterwards, the aperture is corrected based on a deconvolution algorithm to focus the overlaying projections into a single representation of the object. Furthermore, a correction of the geometrical distortions due to the slit geometry is performed. The expected increase of the contrast-to-noise ratio is proportional to the square root of the number of parallel slits in the camera. However, additional noise has to be considered originating from the deconvolution operation. The slit design, functional principle, and the expected limits of this technique are discussed.

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Section: Application Of Twisted Slit Camera For Testing Of Cfrp Compomentioning

confidence: 99%

“…Alternatively to the flying spot technology [18] the diaphragm based camera was explored for applications in NDT [14,19,20]. Fig.…”

Section: Application Of Twisted Slit Camera For Testing Of Cfrp Compomentioning

confidence: 99%

A novel multi slit X-ray backscatter camera based on synthetic aperture focusing

Wieder¹,

Ewert²,

Vogel³

et al. 2017

AIP Conference Proceedings

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“…screening passengers at airports 2 , as well as trucks and cars 3 ), medicine (e.g. assessing bone density 4 ), and aerospace 5 , plus has potential applications in many others such as oil and gas drilling 6 and food inspection 7 .…”

Section: X-ray Backscattermentioning

confidence: 99%

X-ray backscatter sensing of defects in carbon fibre composite materials

O’Flynn

Crews

Fox³

et al. 2017

SPIE Proceedings

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X-ray backscatter (XBS) provides a novel approach to the field of non-destructive evaluation (NDE) in the aerospace industry. XBS is conducted by collecting the radiation which is scattered from a sample illuminated by a well-defined Xray beam, and the technique enables objects to be scanned at a sub-surface level using single-sided access, and without the requirement for coupling with the sample. Single-sided access is of particular importance when the objects of interest are very large, such as aircraft components. Carbon fibre composite materials are being increasingly used as a structural material in aircraft, and there is an increasing demand for techniques which are sensitive to the delaminations which occur in these composites as a result of both large impacts and barely visible impact damage (BVID). The XBS signal is greatly enhanced for plastics and lightweight materials, making it an ideal candidate for probing sub-surface damage and defects in carbon fibre composites. Here we present both computer modelling and experimental data which demonstrate the capability of the XBS technique for identifying hidden defects in carbon fibre.

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“…Ultrasonic testing is the important means to ensure the key equipment manufacturing quality and service safety of the aerospace, nuclear power, high-speed railway, automobile and so on [1][2][3]. Immersion ultrasonic testing is widely used in industrial detection because it has the advantages of small non-detection zone, good coupling, easy automation, and high detection capability for defects such as porosities, cracks, interlayers and folds [4,5].…”

Section: Introductionmentioning

confidence: 99%

An Efficient Ultrasonic SAFT Imaging for Pulse-Echo Immersion Testing

Hu¹,

Jeong²

2017

Journal of the Korean Society for Nondestructive Testing

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An ultrasonic synthetic aperture focusing technique (SAFT) using a root mean square (RMS) velocity model is proposed for pulse-echo immersion testing to improve the computational efficiency. Considering the immersion ultrasonic testing of a steel block as an example, three kinds of imaging were studied (B-Scan, SAFT imaging based on ray tracing technology and RMS velocity). The experimental results show that two kinds of SAFT imaging have almost the same imaging performance, while the efficiency of RMS velocity SAFT imaging is almost 25 times greater than the SAFT based on Snell's law.

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A new X-ray backscatter imaging technique for non-destructive testing of aerospace materials

Cited by 54 publications

References 15 publications

A novel multi slit X-ray backscatter camera based on synthetic aperture focusing

A novel multi slit X-ray backscatter camera based on synthetic aperture focusing

X-ray backscatter sensing of defects in carbon fibre composite materials

An Efficient Ultrasonic SAFT Imaging for Pulse-Echo Immersion Testing

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