Bruker Biospin Gmbh

Frank Schneider

Volker Reiss

Markus Streckfuss

Birk Schütz

A sample exchange device (), in particular, for an NMR spectrometer, comprising a circumferential chain (), sample receptacles () which are disposed on the chain () at equal distances and are connected to each other via webs (), and a measuring or transfer position (), wherein each sample receptacle () can be moved to the measuring or transfer position () by moving the chain (), characterized in that a chain guidance is provided which guides the circumferential chain () along a meandering path. The inventive sample exchange device is particularly economic and does not impair the analysis of the samples.

Sample exchange device having a sample receptacle guided through a meandering path, in particular for an NMR spectrometer

A method for driving a power supply () of a magnetic field coil () for generating a predetermined magnetic field profile(,t) in the volume under investigation of a nuclear magnetic resonance (=NMR) apparatus (), wherein for compensation of distortions caused by the apparatus, an input signal i(t) is predistorted, that predetermines the time behavior of the magnetic field profile, wherein the power supply () is driven by the predistorted signal o(t), is characterized in that the predistortion is performed using a transfer function of the form with s=&#x3c3;+j&#x3c9;, s &#x3b5;C, and with N&#x2267;2, wherein O(s) is the Laplace transform of o(t), and I(s) is the Laplace transform of i(t). This inventive method improves compensation of distortions of one or more gradient fields including their correlations during rapid switching.

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Karlsruhe, Germany

Frank Schneider