| T O P I C R E V I E W |
| qdlaser |
Posted - 04/24/2011 : 4:00:23 PM
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:Windows 7
Dear All,
I have a simple question, but it does puzzle me. Please help me. I have a optical emission spectrum like below. I want to know the area of this peak. I wonder what the difference is between the following two methods.Since they give different value. Many Thanks!
1. Mathematics->Integration
2. Peaks analyzer->integrating peaks.
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| 6 L A T E S T R E P L I E S (Newest First) |
| qdlaser |
Posted - 04/25/2011 : 06:51:07 AM
Dear Liamn, thank you so much for the suggestion. |
| Liamn |
Posted - 04/25/2011 : 04:39:58 AM
Hi qdlaser,
As mentioned by Amanda, basically, baseline and integrating region will lead to different results.
From your graph, integrating regions are the same. Could you check if the baselines are the same?
With Peaks analyzer, you can set Baseline to Y=0 so that it's the same as Mathematics->Integration. To do that, you can go to Baseline Mode page, select the Custom radio, and input 0 after Y=. |
| qdlaser |
Posted - 04/25/2011 : 04:38:20 AM
Thanks, AmandaLu. Original data has been sent. Looking forward to your expert reply. Nice day! |
| AmandaLu |
Posted - 04/25/2011 : 04:19:56 AM
Hi,
I cannot reproduce the problem. Could you please send your data OPJ to us? Then we can try to figure out what's wrong. Please refer to this post in your email.
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| qdlaser |
Posted - 04/25/2011 : 03:50:51 AM
Dear AmandaLu,
Thanks so much for the kind help. Appreciate!
I plot the figure as you suggested, however, the two methods give very much different results. Please refer to the below two figures. Even though, all the integrating region is the same. I really don’t know why. Is there any intrinsic difference? Or which method is more accurate? Do you have any further in depth suggestions? Many thanks in advance.
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| AmandaLu |
Posted - 04/25/2011 : 02:15:06 AM
Hi,
The algorithms of these two tools are the same. However, the different settings of baseline and X range will lead to different results.
For Mathematics -> Integration, you can Use End Points Straight Line as Baseline. If not, X=0 will be used as baseline. In Peak Analyzer, the baseline defining methods are more flexible. The integrate range is depended on the settings in Integration Window Width (on Integrate Peaks page).
Moreover, when Mathematics -> Integration is used, choose Mathematical Area or Absolute Area for Area Type will have different results when your input data has navigate values.
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