Use of a bulk high T/sub c/ magnetometer for non-destructive evaluation

Buckley, J.; Khare, Neeraj; Donaldson, G.B.; Cochran, A.; Hui, Z.

doi:10.1109/20.133853

Cited by 14 publications

(15 citation statements)

References 3 publications

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“…Eventually more controllable two-hole devices were constructed which showed more sensitive performance (Harrop et al 1988;Poulshkin and Vaisiliev 1989;Khare et al 1991). Recently observations of harmonic generation in bulk YBCO have been reported by many workers (Ji et al 1989;Muller 1989;Ishid, a and Goldfarb 1990;Buckley et al 1991;Kumar et al 1993;Gilbricht and Domre 1994;Karthikeyan et al 1994;Revenaz and Dumas 1994). This is an outcome of the nonlinear magnetization behaviour of the material.…”

Section: Introductionmentioning

confidence: 97%

Bulk high-T c magnetometer

1995

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We report a study of a bulk YBCO magnetometer based on the detection of harmonics during nonlinear magnetization. For a low-DC field, the amplitude of the even harmonic appearing at the pickup coil depends linearly on the DC field intensity. The performance of the magnetometer depends on the quality of the sample, and the intensity and frequency of the AC field excitation. At higher Hao, the fourth harmonic becomes more sensitive than the second harmonic. The hysteresis in the magnetometer for DC field measurement has been reported.

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Section: Introductionmentioning

confidence: 97%

Bulk high-T c magnetometer

1995

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“…Since the size of the sensor is small (5 mm × 5 mm), a gradiometer could be constructed using two such sensors. The potential of two-piece bulk high-T c superconductor gradiometers in the non-destructive evaluation of defects in ferromagnetic plates has already been demonstrated [13].…”

Section: Thick Film Magnetic Field Sensormentioning

confidence: 99%

“…Several workers have used the critical state model in which critical current is assumed to depend on the local field, to explain the harmonic generation and dc field modulation of the harmonic amplitudes [2,3]. A bulk high-T c magnetometer has also been developed using this harmonic generation effect [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Frequency-Domain Optical Data Storage of CuCl Semiconductor Nanocrystal Systems

Okamoto¹,

Masumoto²

1996

Jpn. J. Appl. Phys.

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The harmonic generation effect in superconducting Bi(Pb)-Sr-Ca-Cu-O screen printed thick film is reported. When an ac field (H ac > 0.7 G) of frequency 10 kHz is applied to the film, odd harmonics corresponding to frequencies 30, 50 and 70 kHz are observed. The addition of a dc field H dc , induces the generation of even harmonics at frequencies 20, 40, 60, 80 kHz. The amplitudes of these harmonics are studied as a function of H ac and H dc . In the low-field region the amplitude of the even harmonics has been found to vary linearly with H dc with the maximum amplitude change found for the second harmonic. The development of a high-T c thick film magnetometer based on the measurement of the amplitude of the second harmonic is described. The sensitivity of this magnetometer has been found to depend on H ac and on the frequency of the ac field. The lowest field noise was found to be ≈1.5 × 10 −8 T.

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“…In literature, the magnetization of a polycrystalline superconductor is known to be due to the summation of intergranular and intragranular contributions of circulating supercurrents [9]. At low fields intergranular regions dominate the sample's magnetization (i.e.…”

Section: Introductionmentioning

confidence: 99%