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taniasalgueiro
Portugal
13 Posts |
 Posted - 02/11/2014 : 11:24:22 AM
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Origin Ver. and Service Release (Select Help-->About Origin):Origin pro 9
Operating System: Windows 7
I have a question that I know there are topics about that, but really did not understand, so can someone help me?. I have a specific heat graph and I want to know the area of this peak. I also want the enthalpy that's the integration of specific heat. I wanna know what the difference is between the mathematics->Integration and Peaks analyzer->integrating peaks. I understood that's the baseline is different but i don't understand really what it means, and how is correct for my case. Can you help me?
Thank youu |
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zahraa
USA
52 Posts |
Posted - 02/11/2014 : 1:01:17 PM
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Dear Tania,
The baseline defines where you want to start counting your area from. You have to specify what the baseline is, either it could be from one end point to another or it could be a horizontal line starting from either end point etc. There are more options in Peak Analyzer for analysis settings including the ability to have a user defined baseline: http://www.originlab.com/www/helponline/origin/en/UserGuide/Integrate_peaks_with_the_peak_analyzer.html
But Mathematics: Integrate is quicker and out puts data into a a text window. In Mathematics Integrate, you can choose whether you want an Absolute area ( sum of absolute trapezoid values), or a mathematical (algebraic sum of trapezoids) area, and you can also specify whether you want
to have the area start from x=0 or from a baseline that is at either ends of your data.:
http://originlab.com/www/helponline/Origin/en/UserGuide/Integrate.html
Basically the algorithm for both is the same but the results will depend on which baseline you choose and what data ranges you pick. Here are some examples of how you could get areas from a simple curve (areas in pink, baselines in red).
Originlab Technical Representative |
Edited by - zahraa on 02/11/2014 1:07:05 PM |
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taniasalgueiro
Portugal
13 Posts |
Posted - 02/11/2014 : 1:09:20 PM
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Thank you for your help :)
So, in mathematics integrate my y is always 0 and in the peak analyzer i can choose?
quote:
Originally posted by zahraa
Dear Tania,
The baseline defines where you want to start counting your area from. You have to specify what the baseline is, either it could be from one end point to another or it could be a horizontal line starting from either end point etc. There are more options in Peak Analyzer for analysis settings including the ability to have a user defined baseline: http://www.originlab.com/www/helponline/origin/en/UserGuide/Integrate_peaks_with_the_peak_analyzer.html
But Integrate is quicker and out puts data into a a text window. In Mathematics Integrate, you can choose whether you want an Absolute area ( sum of absolute trapezoid values), or a mathematical (algebraic sum of trapezoids) area, and you can also specify whether you want
to have the area start from x=0 or from a baseline that is at either ends of your data.:
http://originlab.com/www/helponline/Origin/en/UserGuide/Integrate.html
Basically the algorithm for both is the same but the results will depend on which baseline you choose and what data ranges you pick. Here are some examples of how you could get areas from a simple curve (areas in pink, baselines in red).
Originlab Technical Representative
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zahraa
USA
52 Posts |
Posted - 02/11/2014 : 1:22:58 PM
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Actually in Mathematics- Integrate you can use the Use End Points as Straight Line as Baseline check box to indicate whether you want a baseline that will go from one end of your curve to the other similar to the second curve in the image above. Other wise the default will be to count the area from the x axis.
In Peak Analyzer, on the Baseline Mode and Base Line Treatment pages, there are numerous options in the drop downs for you to customize your integration. Previews appear in the graph you are analyzing so you can play around with the options in the dialog without clicking Finish to see the different baselines, ranges etc. visually.
Originlab Technical Representative |
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taniasalgueiro
Portugal
13 Posts |
Posted - 02/11/2014 : 1:33:47 PM
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Thanks for your help, i think i understand but in my case I still don't know wich way is more correct.
Thanks anayway! |
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taniasalgueiro
Portugal
13 Posts |
Posted - 02/12/2014 : 04:41:16 AM
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| So I played a little, and the result when I use the constant that peak analyzer give automatically is different that the result when I use mathematic way. But when I choose baseline Y=0 the result is the same tha mathematic way. The results are very very different. Don't know what to do. |
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Difference betweem Mathematics integrate & integra