Patent ID: 6617851
Filing Date: 2003-09-09
Classification: G01R

Abstract:
Probe head for a NMR-spectrometer comprising at least one transmitter unit for generating electromagnetic excitation waves of high frequencies and at least one preamplifier unit (V) for amplification of signals emanating from a sample which has been excited by means of the excitation waves, with a cryogenically cooled primary detection circuit including at least a first antenna (1) and a first waveguide (2), whereby said first antenna (1) is connected to said preamplifier unit (V) via said first waveguide (2), characterized in that at least said first waveguide (2) operates in the range of the anomalous skin effect, whereby the mean free path of the charge carriers at least in said first waveguide (2) being larger than the electromagnetic skin-depth, and whereby said primary detection circuit is provided with means for temporarily matching it with its own characteristic impedance.