Area under peaks

[ocontrol]

We intend using the Labjack in chromatography studies. Is there any way to calculate the area under a defined peak using dacfactory

[AzeoTech]

Yes, most certainly. How depends on whether you need it to find the peak too and whether you want a baseline. Let's assume you know where the peak is and simply want to take the area without a baseline. If you know the start and end point (or time), and have it in variables, you can simply sum:

sum(MyChannel[starttime,endtime]))

and then multiply that times dt:

sum(MyChannel[starttime,endtime])) * (endtime - starttime)

This assumes that you are taking even intervals. For more advanced integration, please see the following topic in this forum:

http://www.azeotech.com/board/index.php?showtopic=1138

Doing baseline and peak finding is a bit more of a challenge and is a bit beyond the level of this forum as its actually a difficult algorithm that often is different depending on the type of signal. If you are interested in this, email us directly at support at azeotech.com.