SpinCore Hahn-Echo package for RadioProcessor and iSpin-NMR

The Hahn-Echo experiment program is included with the SpinAPI package in the RadioProcessor directory.

Figure 1 shown below depicts a Hahn-Echo experiment conducted on household cooking oil using a 10.8 MHz permanent magnet.



        Fig 1.

Figure 1 shows what the signal looks like when capturing data continuously during a Hahn-Echo experiment. The large spike is the 180 degree pulse being applied.

Figure 2 below shows the pulse sequence used by the RadioProcessor to perform this experiment. Each vertical line is a new instruction, and the names of the delays used are shown with arrows. The Hahn-Echo program included in the \SpinAPI\RadioProcessor directory will accept command line parameters which can be used to specify the values for each of the pulse program parameters.


        Fig 2.

Shown in this figure is what the RF excitation pulse will look like, as well as what the acquired baseband data will look like. The tx_enable and scan_trigger signals are both internal signals used to control the timing of the experiment.