Hi Kihong,

The peak-to-valley wavefront error is not a metric tied to the interferogram analysis. It is more natural for me to read it directly from the wavefront map analysis.

In this post, @Hui Chen discusses a method using the ZERN operand, which is probably the fastest method of all because it uses a native operand.

Additionally, I made a user-defined operand where I computed the peak-to-valley from the data of the wavefront map analysis directly (without writting to a text file) in case you want to try its speed. The advantage with this method is that you can then compute any metric you like from the wavefront map data. The UDOC is embedded in the archive attached, and the source code can be found in this repository.

The archive contains the Double Gauss sample file with the wavefront map at field 3. I have placed a ZERN operand, and the UDOC for you to compare the results.

Let me know if this helps, and take care,

David