A high-Tc SQUID-based sensor head cooled by a Joule-Thomson cryocooler

A.P. Rijpma; H.J.M. Brake, ter; E. Vries, de; N. Nijhof; H.J. Holland; H. Rogalla

doi:10.1016/S0921-4534(02)00672-X

A high-Tc SQUID-based sensor head cooled by a Joule-Thomson cryocooler

A.P. Rijpma
, H.J.M. Brake, ter
, E. Vries, de
, N. Nijhof
, H.J. Holland
, H. Rogalla

Research output: Contribution to journal › Article › Academic › peer-review

6 Citations (Scopus)

Abstract

The goal of the so-called FHARMON project is to develop a high-Tc SQUID-based magnetometer system for the measurement of fetal heart activity in std. clin. environments. To lower the threshold for the application of this fetal heart monitor, it should be simple to operate. It is, therefore, advantageous to replace the liq. cryogen bath by a closed-cycle refrigerator. For this purpose, we selected a mixed-gas Joule-Thomson cooler; the APD Cryotiger. Because of its magnetic interference, the compressor of this closed-cycle cooler will be placed at a distance of ~2 m from the actual sensor, which is an axial second order gradiometer. The gradiometer is formed by three magnetometers placed on an alumina cylinder, which is connected to the cold head of the cooler. This paper describes the sensor head in detail and reports on test expts.

Original language	English
Pages (from-to)	209-212
Number of pages	4
Journal	Physica C : Superconductivity
Volume	372-376
Issue number	Part 1
DOIs	https://doi.org/10.1016/S0921-4534(02)00672-X
Publication status	Published - 2002

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title = "A high-Tc SQUID-based sensor head cooled by a Joule-Thomson cryocooler",

abstract = "The goal of the so-called FHARMON project is to develop a high-Tc SQUID-based magnetometer system for the measurement of fetal heart activity in std. clin. environments. To lower the threshold for the application of this fetal heart monitor, it should be simple to operate. It is, therefore, advantageous to replace the liq. cryogen bath by a closed-cycle refrigerator. For this purpose, we selected a mixed-gas Joule-Thomson cooler; the APD Cryotiger. Because of its magnetic interference, the compressor of this closed-cycle cooler will be placed at a distance of \textasciitilde{}2 m from the actual sensor, which is an axial second order gradiometer. The gradiometer is formed by three magnetometers placed on an alumina cylinder, which is connected to the cold head of the cooler. This paper describes the sensor head in detail and reports on test expts.",

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year = "2002",

doi = "10.1016/S0921-4534(02)00672-X",

language = "English",

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T1 - A high-Tc SQUID-based sensor head cooled by a Joule-Thomson cryocooler

AU - Rijpma, A.P.

AU - Brake, ter, H.J.M.

AU - Vries, de, E.

AU - Nijhof, N.

AU - Holland, H.J.

AU - Rogalla, H.

PY - 2002

Y1 - 2002

N2 - The goal of the so-called FHARMON project is to develop a high-Tc SQUID-based magnetometer system for the measurement of fetal heart activity in std. clin. environments. To lower the threshold for the application of this fetal heart monitor, it should be simple to operate. It is, therefore, advantageous to replace the liq. cryogen bath by a closed-cycle refrigerator. For this purpose, we selected a mixed-gas Joule-Thomson cooler; the APD Cryotiger. Because of its magnetic interference, the compressor of this closed-cycle cooler will be placed at a distance of ~2 m from the actual sensor, which is an axial second order gradiometer. The gradiometer is formed by three magnetometers placed on an alumina cylinder, which is connected to the cold head of the cooler. This paper describes the sensor head in detail and reports on test expts.

AB - The goal of the so-called FHARMON project is to develop a high-Tc SQUID-based magnetometer system for the measurement of fetal heart activity in std. clin. environments. To lower the threshold for the application of this fetal heart monitor, it should be simple to operate. It is, therefore, advantageous to replace the liq. cryogen bath by a closed-cycle refrigerator. For this purpose, we selected a mixed-gas Joule-Thomson cooler; the APD Cryotiger. Because of its magnetic interference, the compressor of this closed-cycle cooler will be placed at a distance of ~2 m from the actual sensor, which is an axial second order gradiometer. The gradiometer is formed by three magnetometers placed on an alumina cylinder, which is connected to the cold head of the cooler. This paper describes the sensor head in detail and reports on test expts.

U2 - 10.1016/S0921-4534(02)00672-X

DO - 10.1016/S0921-4534(02)00672-X

M3 - Article

SN - 0921-4534

VL - 372-376

SP - 209

EP - 212

JO - Physica C : Superconductivity

JF - Physica C : Superconductivity

IS - Part 1

ER -

A high-Tc SQUID-based sensor head cooled by a Joule-Thomson cryocooler

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