[dsg-hdice] fsNMR request - X and Y scaling calculation

[Tyler Lemon]

Hi Xiangdong,

Thanks for your reply.

I'll take a look and see how to implement the curve fitting for the background to get R0bkgd. We can also discuss it more in this week's DSG-HDice meeting.

To be able to take a look at this and run the program, we'd need to be able to use an NMR rack with equipment connected. I know you are using Rack 2 and the PC HDICENMR2 to run tests currently. Are there any other PCs in racks with equipment connected?

Tyler
________________________________
From: Xiangdong Wei <xwei at jlab.org>
Sent: Monday, August 17, 2020 5:21 PM
To: Tyler Lemon <tlemon at jlab.org>
Subject: Re: fsNMR request - X and Y scaling calculation

Hi Tyler,

The equations are correct. The R0bkgd is a little bit tricky to determine because the amplitude of the first measured point jumps around if the ending point amplitude is much differ from the starting point. I think, for practical reason, we should ignore the first 10 points and then look for the maximum. (Since R is always positive, I assume that "absolute maximum" means the global max, if R has multiple peaks.)

The R0 should be determined by fitting Gaussian Curve for 100 points around maximum peak, or 3rd-order polynomial if monotonic (still skip the first 10 points).

Thanks,

Xiangdong
________________________________
From: dsg-hdice <dsg-hdice-bounces at jlab.org> on behalf of Tyler Lemon <tlemon at jlab.org>
Sent: Monday, August 17, 2020 11:08 AM
To: dsg-hdice at jlab.org <dsg-hdice at jlab.org>
Subject: [dsg-hdice] fsNMR request - X and Y scaling calculation


Hi Xiangdong,

Below are the equations you sent us last week. I corrected them from the second email you sent. Can you verify that the equations and component definitions are correct? I made the equations in LaTeX so they have the correct formatting so if you can't see them or something, please let me know and I can resend them.

[cid:e8fb2899-fbd8-45fa-befc-bfd4145f8bae]

I also have some questions on what you're requesting:

  1.  Do you want to completely remove the acquisition of X and Y from the fsNMR program when scaling and replace it with calculated X and Y using the formulas?
  2.  If #1 is correct, shouldn't the non-scaled data acquisition also be changed to calculate X and Y rather than acquiring it from the lock-in amplifier?

-Tyler

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