Home Forums Imaging Aligning laser log file with the data intensity time series

This topic contains 4 replies, has 2 voices, and was last updated by  Dr Tephy Marillo-Sialer 8 months, 3 weeks ago.

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  • #10850

    Will Amidon
    Participant

    Hi,

    We are using the mapping function in Iolite version 3 with a laser log file imported from an NWR 213 laser. We are having trouble manually aligning the laser log file with the data intensity plot during the ‘automatic selections’ process.

    We go to automatic selections and choose ‘laser log file’ and then the new window pops up showing the laser log time series and the measured intensity data. We manually drag the laser log data to overlay on the intensity data, but are having trouble getting perfect alignment. When the integrations are assigned they are badly offset, which ultimately creates offset images (I think).

    Is there any way to zoom in on the alignment plot so we can visually verify that the two data sets are properly aligned? Currently our plot is zoomed out so we see 5 hours of data at once! Are there other workarounds? The two datasets do seem to be snapping to each other a bit, but are not always creating the correct match.

    Thanks for your help!

    Will

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  • #10860

    Hi Will,

    You can zoom in by holding down the mouse button and dragging to define a marquee on the area of interest, and then right-clicking within that area to bring up the zoom options menu.

    #10930

    Will Amidon
    Participant

    Thank you very much Tephy, i will give that a try!

    #11106

    Will Amidon
    Participant

    Hi Tephy,

    A related question on the same thread… Is there a way to change what ‘channel’ is displayed on the data intensity graph within the ‘drag to sync’ window? Alternatively, is there a way to put the data intensity graph on a log scale?

    We are still having trouble deciding where to align our laser log file because we can’t tell when the laser starts firing based on the graph of total beam intensity. This is because we start out our laser scans on epoxy, but the total beam doesn’t jump up until the scan crosses onto the crystal. We could solve this problem by looking at a different ‘channel,’ for example 238U, which is relatively high in the epoxy. or by having a log scale where we can see smaller changes in the total beam intensity.

    I imagine this is an easy thing in Igor. Apologies we are novice users with Igor!

    Thanks,
    Will

    #11173

    Hi Will,

    Unfortunately there’s no easy way to change the laser log window settings.

    The best alternative in you case would be to allow iolite to sync the laser log data and the mass spec data automatically. That way iolite will try to match the timestamp info on both files, discarding any minor time offset and ignoring the channel intensity info.

    Tephy

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