HTS SQUID system with Joule-Thomson cryocooler for eddy current nondestructive evaluation of aircraft structures

被引：28

作者：

Hohmann, R ^{[1
]}

Krause, HJ ^{[1
]}

Soltner, H ^{[1
]}

Zhang, Y ^{[1
]}

Copetti, CA ^{[1
]}

Bousack, H ^{[1
]}

Braginski, AI ^{[1
]}

Faley, MI ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1997年 / 7卷 / 02期

关键词：

D O I：

10.1109/77.621886

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

For the detection of deep-lying flaws in aircraft structures, are eddy current system ire conjunction with a planar SQUID gradiometer is being developed, The need for a mobile system imposes additional requirements on cooling regarding mobility, operation independent of spatial orientation, and handling. We present results on the operation of HTS SQUIDs the commercial Joule-Thomson-cryocooler KC 100 (''cryotiger'') by APD and report on cooler characteristics and system performance. Magnetometers and gradiometers of both rf and de type have been integrated with the cryocooler, Noise spec;ra both in unshielded and shielded environments have been shown to be orientation independent. Compared to stationary operation, the system sensitivity is reduced by additional noise generated by the movement, With an improved integration scheme, this motion-related noise is nearly eliminated, The system was equipped with a differential eddy current elicitation and a synchronized digital lock-in detection. Two-dimensional scans are presented that illustrate the system's capability to find fatigue cracks and corrosion pits hidden below several layers of aluminum.

引用

页码：2860 / 2865

页数：6

共 17 条

[1]

BERBRAKE HJM, 1996, IN PRESS CRYOCOOLERS, V9

[2]

CARR C, 1997, IN PRESS REV PROGR Q, V13

[3] NOISE PROPERTIES OF DIRECT-CURRENT SQUIDS WITH QUASIPLANAR YBA2CU3O7 JOSEPHSON-JUNCTIONS [J].

FALEY, MI ;

POPPE, U ;

URBAN, K ;

HILGENKAMP, H ;

HEMMES, H ;

AARNINK, W ;

FLOKSTRA, J ;

ROGALLA, H .

APPLIED PHYSICS LETTERS, 1995, 67 (14) :2087-2089

[4]

FALEY MI, 1997, IN PRESS IEEE T JUN

[5]

HOHMANN R, 1996, IN PRESS CRYOCOOLERS, V9

[6] OPERATION OF BICRYSTAL JUNCTION HIGH-T-C DIRECT CURRENT-SQUID IN A PORTABLE MICROCOOLER [J].

KHARE, N ;

CHAUDHARI, P .

APPLIED PHYSICS LETTERS, 1994, 65 (18) :2353-2355

[7]

LUCIA ML, 1997, IN PRESS IEEE T JUN

[8] Eddy current technique with high temperature SQUID for non-destructive evaluation of non-magnetic metallic structures [J].

Tavrin, Y ;

Krause, HJ ;

Wolf, W ;

Glyantsev, V ;

Schubert, J ;

Zander, W ;

Bousack, H .

CRYOGENICS, 1996, 36 (02) :83-86

[9]

THUMMES G, 1996, IN PRESS P 16 ICEC K

[10] MAGNETIC-FIELD FLUCTUATIONS ARISING FROM THERMAL MOTION OF ELECTRIC CHARGE IN CONDUCTORS [J].

VARPULA, T ;

POUTANEN, T .

JOURNAL OF APPLIED PHYSICS, 1984, 55 (11) :4015-4021

← 1 2 →