Week 3/13-3/17/17

As promised from the previous post, I will explain how to read data from the spectrum the FTIR gives.

This is the spectrum of a sample and what we want to get from this is the height and position of the peak. The first peak (going from left to right) indicates that oxygen is present. The second peak, the one that splits into two at the top, indicates CO2. These two are what we want to measure. Doing this is very simple since the program has a tool that can be used to measure it.

This tool is called Baseline correct. To my understanding, it allows us to create a line under the peaks which then makes a function of whatever lies above that line. Afterwards we can choose any point above the line and it would give the height.

 At first glance will look like this:

Before the line can be drawn, the tool has to be on specific settings. First, the function type needs to be changed to “spline” and “auto-y” needs to checked off to make placing the line easier. After that is done, making the line is easy by clicking anywhere near the peak that is being measured but not on it. Doing so will result with something like this:

After that, hit replace giving a zoomed in version of just the peak. From here, we select another tool that allows to measure the height of the peak. A horizontal line acts as zero and a vertical line that gives the height on the given point from the horizontal. Both of these lines can be moved freely throughout the spectrum.

The bottom left corner of the program will give us the height and position. In this case the height: 1.252 and position(x value): 3536

Afterward, we do this for the CO2 peak. The same process except we get two heights.

This is the data collecting process I go through and it is not that difficult (so far). I find it a lot more difficult to get the spectrum itself versus reading it. Regardless, there will be problems still to overcome.