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Measures to reduce the residual field and field gradient inside a magnetically shielded room by a factor of more than 10

Voigt J., Knappe-Grüneberg S., Schnabel A., Körber R., Burghoff M.

Metrology and Measurement Systems

2013

Vol. 20, nr 2

237--248

Very low residual magnetic field and field gradients are essential for a number of high resolution fundamental physical experiments and for further improvement of very sensitive magnetic measurement devices. The scope ranges from spin precession experiments, e.g. with 3He or neutrons, to biomagnetic measurements, like magnetoencephalograms, and to low field MR spectroscopy. One method of reducing environmental magnetic noise is to use a magnetically shielded room (MSR). Here, measures are demonstrated to improve residual field and field gradient inside a common MSR by a factor of more than 10 by a specific degaussing procedure, material selection of prefabricated parts and active shielding. The process is independent of the shielding factor and works also properly for heavily shielded rooms.

Optimisation of the warp yarn tension on a warp knitting machine

Pohlen V., Schnabel A., Neumann F., Gries T.

Autex Research Journal

2012

Vol. 12, no. 2

29--33

Investigations (calculations) based on a warp yarn tension analysis on a warp knitting machine with multiaxial weft yarn insertion allow prospective reduced yarn tension differences in technical warp knits. From this a future opportunity is provided to substitute the subjective warp let-off adjustment by a model of tension control. The outcome of this is a higher reproducibility with associated increasing process reliability and rising product quality.