A 35 GHz vector system for non destructive applications

Glay, D.; Lasri, T.; Mamouni, A.; Leroy, Y.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p579
Academic Journal
It has been demonstrated that microwave techniques are well suited for nondestructive testing (NDT) of materials. The challenge now is to propose systems that can compete, in terms of reliability, precision and fabrication cost, with those already existing. Microwaves are expected to play a fundamental role if we are able to develop both methods and systems to fulfill the increasing demand of characterization in this dynamic field. We have developed devices operating at 2.45 and 10 GHz that have been used successfully for layer thickness and material parameters (permittivity, moisture,...) measurement. In order to tackle other problems met by the NDT community, that need to operate at higher frequencies we have conceived a sensor for the determination of the material under test reflection coefficient (magnitude and phase) at 35 GHz. This system conceived around a complex correlator (or IQ demodulator), made in microstrip technology, is used for the detection of flaws inside dielectric materials or on surface conductors. These investigations concern defects with various shapes, sizes, and dielectric properties. © 2000 American Institute of Physics.


Related Articles

  • Modulated optical reflectance NDE of superconducting thin film microwave devices. Almond, D. P.; Nokrach, P.; Stokes, E. W. R.; Porch, A.; Foulds, S. A. L.; Wellhofer, F.; Powell, J. R.; Abell, J. S. // AIP Conference Proceedings;2000, Vol. 509 Issue 1, p627 

    It has been demonstrated that the room temperature modulated optical reflectance (MOR) signal from high temperature superconducting (HTS) thin film material with good superconducting characteristics is much higher (approx. 20 times) than from poor under-doped HTS material. The differences...

  • Microwave detection of delaminations between fiber reinforced polymer (FRP) composite and hardened cement paste. Hughes, D.; Kazemi, M.; Marler, K.; Zoughi, R.; Myers, J.; Nanni, A. // AIP Conference Proceedings;2002, Vol. 615 Issue 1, p512 

    Fiber reinforced polymer (FRP) composites are increasingly being used for the rehabilitation of concrete structures. Detection and characterization of delaminations between an FRP composite and a concrete surface are of paramount importance. Consequently, the development of a one sided,...

  • Microwave analysis of mortar prepared with type I/II, III and V cement and subjected to cyclical chloride exposure. Case, J. T.; Zoughi, R.; Donnell, K.; Hughes, D.; Kurtis, K. E. // AIP Conference Proceedings;2002, Vol. 615 Issue 1, p498 

    The presence of a sufficient concentration of chloride ions at the steel/concrete interface can lead to the initiation of corrosion in reinforced concrete structures. To this end, a set of near-field microwave nondestructive testing experiments were conducted using three mortar specimens made...

  • Microwave imaging of delaminations in IC packages. Ju, Y.; Saka, M.; Abe´, H. // AIP Conference Proceedings;2002, Vol. 615 Issue 1, p468 

    Delaminations, which may occur between the chip pad and the encapsulant resin in IC packages, have been inspected by microwave imaging technique. For further increasing the sensitivity of the measurement, optimization of standoff distance between the sensor aperture and the sample surface is...

  • Microwave evaluation of accelerated chloride ingress in mortar. Hu, C.; Case, T.; Castle, M.; Zoughi, R.; Kurtis, K. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p467 

    Corrosion of steel in reinforced concrete structures can be induced by the presence of chloride ions near the steel/concrete interface. To show the potential of microwave nondestructive testing techniques for evaluating chloride ingress, 8[sup ″]×8[sup ″]×8[sup ″]...

  • Microwave inspection of bridge fatigue cracks in railroad overpass. Campbell, H.; Winkler, E.; Qaddoumi, N.; Zoughi, R.; Raymond, D.; Williams, D.; Meheen, J. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p438 

    This paper presents the results of an investigation using microwave nondestructive testing techniques for detection of fatigue cracks in a railroad overpass bridge. Specifically, crack detection in this bridge structure using open-ended rectangular waveguide probes is examined. A dominant mode...

  • NDT Info.  // Insight: Non-Destructive Testing & Condition Monitoring;Jul2015, Vol. 57 Issue 7, p418 

    Several abstracts for articles on non-destructive testing including relationship between non-destructive testing methods and art law, use of sensors and microwaves in treatment of wood and application of a cryoblasting method for the cleaning of stone surfaces.

  • Microwave detection of covered surface cracks in metals. Wang, N.; Donnell, K.; Castle, M.; Zoughi, R.; Novack, M. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p430 

    This paper presents the results of detecting tight cracks under thin coatings, such as primer and paint, using open-ended coaxial probes and open-ended rectangular waveguide probes. For the latter case the properties of higher-order modes are utilized. Influences of crack size, probe size,...

  • A stochastic microwave imaging approach for NDE applications. Caorsi, S.; Massa, A.; Pastorino, M. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p422 

    This paper deals with a microwave imaging approach based on a genetic algorithm for nondestructive testing and evaluation. Starting from an integral formulation of the interactions between an interrogating electromagnetic wave and the scatterer under test, a generalized solution of the arising...


Read the Article


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

Try another library?
Sign out of this library

Other Topics