Variable-Power Broadband Decoupler for NMR Spectrometers
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02
In the prior art, as shown in Fig. 1, broadband decoupling is a technique routinely used in NMR spectroscopy. At present the phase of a radio frequency is pseudo-randomly shifted by 180 degrees and this phase shift is kept constant for all decoupling power settings. A continuous, recycled sequence of pulses with phase A (0 degrees, for example) or with phase B (180 degrees, for example) produces effective broadband decoupling. The length of the pulses, however, has to be calibrated for each decoupling radio frequency amplitude H2 . The apparatus shown in Fig. 2 combines a sequence of 1's and 0's stored in memory 1 with a programmable frequency divider 2 to generate the phase pulses for each given decoupling amplitude H2 .