Subtraction

Since CIVA 2015.a, the subtraction between two signals is available from the “Signal processing” icon in the analysis bar.

 

 

Clicking on this icon opens a post-processing window, with the “Envelope” processing type defined by default.

 

 

To access to the other processing types, click on “Envelope”, and the whole list will appear.

 

 

Select “Subtraction” and the appropriate window opens.

Now, as in the previous CIVA versions, you can directly delimit the signal to remove on the reference signal A-scan. The output signal A-scan will be interactively modified. Then click on “Apply” and then on “New” to open the new analysis window with the output signal A-scan.

In the example below, the lateral wave is removed from a TOFD inspection A-scan.

 

 

 

It is also possible to load a reference signal in a .txt format and apply the subtraction of the whole reference signal, or only a part of it, by modifying the “min Time” and “max Time”.