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Sampling of the signal with the pulsed nmr application
Posted: Tue May 24, 2022 6:13 pm
by tt10977
Hi guys,
I have recently been working with Pavel Demins pulsed NMR application. After setting up some hardware I started performing measurements in the laboratory. Using an Oscilloscope, I was able to observe FIDs of several samples. Unfortunately, the NMR application seems to do something else than simply plotting the voltage on the input. (I couldn’t find much information about that.)
Is there a possibility to adapt the application to receive a plot of the voltage signal?
I would be very grateful, if someone could help me with that.
Thanks!
Re: Sampling of the signal with the pulsed nmr application
Posted: Tue May 24, 2022 7:36 pm
by pavel
The last time I worked on this project, I mainly focused on the FPGA and server code. They are now functional and well tested.
The currently recommended way to use this project is to control the FPGA code and read the data using the following .NET library:
https://github.com/pavel-demin/red-pita ... lsedNMR.cs
The GUI part of this project is still very basic and I currently do not have the necessary hardware to work on it.
I think that to see the voltage signal it should be enough to set the RX frequency to 0 by replacing the following line in pulsed_nmr.py:
Code: Select all
self.socket.write(struct.pack('<Q', 0<<60 | int(1.0e6 * value)))
with
Code: Select all
self.socket.write(struct.pack('<Q', 0<<60 | int(1.0e6 * 0)))
Re: Sampling of the signal with the pulsed nmr application
Posted: Wed May 25, 2022 7:53 am
by tt10977
Dear Pawel,
thank you very much for your quick reply. I changed the line in the .py-file and everything seems to work perfectly fine. Right now I only checked it with a DC-Voltage on the input, but at least for this DC-Voltage it worked perefectly fine. I'm goning to check it with the whole hardware and the FID signal later that day. I think it should also work for a generall voltage-signal.
Thank you very much for your help!
Re: Sampling of the signal with the pulsed nmr application
Posted: Thu Jun 30, 2022 6:35 pm
by fbalakirev
pavel wrote: ↑Tue May 24, 2022 7:36 pm
I currently do not have the necessary hardware to work on it.
Dear Pavel,
Do you have any suggestions for the external hardware components and overall configuration for your NMR project?
Re: Sampling of the signal with the pulsed nmr application
Posted: Thu Jun 30, 2022 7:07 pm
by pavel
As far as I know, the following components are required:
- TX power amplifier
- TX/RX switch
- probe
- strong uniform magnetic field
- RX amplifier
The amplifiers connect to the RF inputs and outputs of the Red Pitaya board and the TX/RX switch is controlled by a GPIO pin.