Design and application of a small size SAFT imaging system for concrete structure

Shao, Zhixue; Shi, Lihua; Shao, Zhe; Cai, Jian
July 2011
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p073708
Academic Journal
A method of ultrasonic imaging detection is presented for quick non-destructive testing (NDT) of concrete structures using synthesized aperture focusing technology (SAFT). A low cost ultrasonic sensor array consisting of 12 market available low frequency ultrasonic transducers is designed and manufactured. A channel compensation method is proposed to improve the consistency of different transducers. The controlling devices for array scan as well as the virtual instrument for SAFT imaging are designed. In the coarse scan mode with the scan step of 50 mm, the system can quickly give an image display of a cross section of 600 mm (L) × 300 mm (D) by one measurement. In the refined scan model, the system can reduce the scan step and give an image display of the same cross section by moving the sensor array several times. Experiments on staircase specimen, concrete slab with embedded target, and building floor with underground pipe line all verify the efficiency of the proposed method.


Related Articles

  • ULTRASONIC INSPECTION OF DAMAGE IN IMPACTED COMPOSITE PANELS. Ručevskis, Sandris // Construction Science;2007, Vol. 8, p71 

    In the present paper, an ultrasonic non-destructive technique for the evaluation of cracks and delaminations in curved one-stringer stiffened composite panels is described. The pulse-echo ultrasonic imaging technique is used to produce high-resolution images of internal defects in composite...

  • Improving Cardiac Imaging.  // R&D Magazine;Sep2005, Vol. 47 Issue 9, p34 

    Presents information on the S5-1 Ultrasound Transducer with PureWave Crystal Technology created by Rajesh Panda and Jie Chen of Philips Ultrasound. Features of the device; Ultrasonic picture quality achieved with the S5-1 transducer.

  • ULTRASONICS: An improved design of an ultrasonic apparatus for characterising material samples. Bouhadjera, Abdelmalek // Insight: Non-Destructive Testing & Condition Monitoring;Sep2004, Vol. 46 Issue 9, p554 

    A design of an ultrasonic apparatus for testing material samples is presented. It is based on a pulse-echo technique and involves wave reflection and refraction at a liquid-solid interface. The main part of the apparatus is a transducer-cell, which holds the sample under test (SUT). The novelty...

  • Investigating post-processing of phased array data for detection and sizing capabilities using incoherent compounding. Pettigrew, I. G.; Lines, D. I. A.; Kirk, K. J.; Cochran, S. // Insight: Non-Destructive Testing & Condition Monitoring;Apr2006, Vol. 48 Issue 4, p228 

    Advanced non-destructive techniques integrate ultrasonic arrays with array controllers that perform full waveform capture (FWC). FWC is the term used to describe the acquisition of RF waveforms corresponding to specific transmit-receive beams from an array. With FWC, the full waveform is...

  • Ultrasonic detectability of potentially closed cracks from cold-worked holes under loaded conditions. Nelson, L. J.; Brown, K.; Young, A.; Jones, L. D.; Smith, R. A. // Insight: Non-Destructive Testing & Condition Monitoring;Feb2008, Vol. 50 Issue 2, p78 

    Many non-destructive inspections for cracks rely on detecting ultrasound scattered or reflected from the crack. Recently, several methods for second-layer ultrasonic crack detection have been developed, sometimes using automated analysis methods to interpret the complex ultrasonic responses from...

  • NDT Info.  // Insight: Non-Destructive Testing & Condition Monitoring;Jul2014, Vol. 56 Issue 7, p398 

    The article presents list of several papers on non-destructive testing and condition monitoring which include "NDE challenger in aerospace," by R. Engerlbart, "Filler wire in ship building," by K. Vishnuraj and colleagues, and "Ultrasonic imaging: an historical perspective," by V. M. Joshi.

  • Air-coupled ultrasound as a tool for new NDE applications. Stoessel, R.; Krohn, N.; Pfleiderer, K.; Busse, G. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p1592 

    Ultrasound testing is a standard non-destructive evaluation method that requires a coupling medium, e.g. water, which cannot be used for some materials. A new commercially available device uses improved transducers and sensitive electronics to enhance the signal-to-noise ratio so that...

  • Optimization of design factors and an operating regime of a magnetic-marking device in an extensometer for steel ropes. Gol’dshtein, A.; Urazbekov, E. // Russian Journal of Nondestructive Testing;Aug2007, Vol. 43 Issue 8, p515 

    An analytic expression that describes the field of a magnetic mark applied by an electromagnet equipped with an E-type core is obtained on the basis of experimental results. The dependence of characteristics of the magnetic field of the mark on the main parameters of the electromagnet is...

  • Appearances of von Meyenburg Complex on Cross Sectional Imaging. Lung, Phillip F. C.; Jaffer, Ounali S.; Akbar, Nuzhat; Sidhu, Paul S.; Ryan, Suzanne M. // Journal of Clinical Imaging Science;Jan-Mar2013, Vol. 3 Issue 1, p1 

    The von Meyenburg complex (VMC) is an uncommon congenital malformation and is characterized by benign bile duct hamartomas. These are usually discovered incidentally and may represent a diagnostic dilemma when liver metastases are suspected. MRI of VMC shows distinct imaging characteristics, but...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics