Microwave Scanning Microscopy for Non-Destructive Testing

Husain, A.; Ash, E.A.

doi:10.1109/euma.1975.332181

Cited by 22 publications

(23 citation statements)

References 1 publication

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“…The result, which shows that the fractional frequency shift is very nearly the ratio of the magnetic energy in the flaw to the total resonator energy, generalizes to ferromagnetic resonators the Slater Perturbation Theorem for electromagnetic resonators (4). Use of such resonators, perturbed by access through a small hole in the enclosure, has previously been demonstrated as a surface flaw detection technique (5). FlAR resonators have the advantages of being more sensitive and more easily manipulated, because of their small size.…”

mentioning

confidence: 83%

A Novel Microwave Ferromagnetic Resonance Probe for Eddy Current Detection of Surface Flaws in Metals

Auld

Elston

Winslow

1978

1978 8th European Microwave Conference

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A new type of eddy current probe has been developed for detecting surface flaws in metals. By contrast with traditionel devices it operates at microwave frequencies and uses an yttrium iron garnet (YIG) ferromagnetic resonator. Such resonators experience a frequency shift when brought into proximity with a metal surface because of the perturbation of the microwave field external to the resonator. A crack in the metal disturbs the surface currents and produces an additional perturbation of the frequency. This paper reports the basic principles of operation and results of experiments performed on machined slots in aluminium. Fractional frequency shifts as large as 0.5 percent were observed for a slot with an opening 115 ,pm wide. An unloaded fatigue crack in a nonmagnetic stainless steel test sample was also easily detected, in accord with the simple theory, which predicts a response proportional to the slot opening.

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mentioning

confidence: 83%

A Novel Microwave Ferromagnetic Resonance Probe for Eddy Current Detection of Surface Flaws in Metals

Auld

Elston

Winslow

1978

1978 8th European Microwave Conference

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“…The resonant probes provide many advantages over other probes based on measurements of the changes in the reflection coefficient. Recently, several techniques with resonant probes have been reported on, including those using a microstrip linear resonator, quarterwavelength microstrip line, dual-behavior resonator filter, and complementary split-ring resonator [11][12][13][14]. A more general review of state-of-the-art NDT techniques using microwave technologies has been provided elsewhere [15].…”

Section: Introductionmentioning

confidence: 99%

Non-contact Crack Detection in Metals Using a Cutoff-Cavity Probe

Kim

Kwon

et al. 2021

J Electromagn Eng Sci

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This paper presents a non-contact method for the detection of surface cracks in metal materials through a forced-resonance microwave method (FRMM) using a cutoff cavity-backed narrow slot as a crack detection probe without using a vector network analyzer (VNA) at microwave frequencies. The FRMM uses the deviations in the ammeter or voltmeter readings of the forcefully obtained resonance of a cutoff-cavity probe for a metal material with or without cracks. The cutoff cavity-backed narrow slot on metal with no cracks produces a series resonance (maximum current) or a parallel resonance through an external control element located on a post inside the cutoff cavity. Cracks were detected by a change in this forced-resonance state (maximum current) when the cutoff-cavity probe was scanned over a crack. The characteristic crack signal was derived from the resonance current deviation on the ammeter located on a post inside the cavity probe. Galerkin’s method of moments was used to obtain a forced-resonance state from which the crack signal of the FRMM was calculated. The experimental measurements for non-contact (remote or lift-off) crack detection are also presented.

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“…Resonant probes provide many advantages compared with other probes based on measure-ing changes in the reflection coefficient. Several technologies with resonant probes for crack detection have been reported, including a microstrip linear resonator, a quarter-wavelength microstrip line, a dual-behavior resonator filter, and a complementary split-ring resonator [11][12][13][14]. A more general review of state-of-the-art NDT techniques using microwave technologies is described in [15].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of a Cutoff Cavity Probe Applicable to Crack Detection Using the Forced Resonance Microwave Method

Kim

Kim²,

Kwon

et al. 2020

J Electromagn Eng Sci

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This paper presents the current characteristics inside a cutoff cavity slot probe applied to crack detection using the forced resonance microwave method (FRMM). Crack detection using FRMM has two stages: preparation and detection. In the preparation stage, the current characteristics inside the probe with a shorting plate are important for determining the crack signal and detection sensitivity. The cutoff cavity probe produces a forced resonance by adjusting a control element. There are two kinds of forced resonance: series resonance (SR) and parallel resonance (PR). Four types of current characteristics are applied to crack detection using FRMM: SR, the region around SR, the region around PR, and non-resonance. These current characteristics are discussed from the point of view of current change for crack detection. The experimental results are compared with the theoretical results to check the current state inside the cutoff cavity probe.

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Microwave Scanning Microscopy for Non-Destructive Testing

Cited by 22 publications

References 1 publication

A Novel Microwave Ferromagnetic Resonance Probe for Eddy Current Detection of Surface Flaws in Metals

A Novel Microwave Ferromagnetic Resonance Probe for Eddy Current Detection of Surface Flaws in Metals

Non-contact Crack Detection in Metals Using a Cutoff-Cavity Probe

Characteristics of a Cutoff Cavity Probe Applicable to Crack Detection Using the Forced Resonance Microwave Method

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