QCM Analyzer

Posted on November 9th, 2015
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QCMs are small devices used by the contamination community to characterize vacuum chamber bakeouts and to monitor cleanliness during thermal vacuum (TVAC) testing. QCMs can be used to determine outgassing rates (delta), and whether the depletion curve has started to plateau (delta-delta). They can even be used to determine the condensation temperature of the molecular contaminants (TGA). This analysis can be performed manually in Excel. However, it can get quite tedious. So recently, while supporting a TVAC test, I developed an HTML/Javascript-based analyzer of QCM data. The code was written mainly for QCM Research files but it has basic support for CrystalTek as well. The analyzer automatically moves comments and joins appended data, computes smoothed delta-deltas, and can be used to perform interactive TGAs with reference curves. Please start by reviewing the user’s guide, which contains step-by-step instructions. Note that the analyzer runs completely in your browser. Your data is NOT communicated to our web server.

QCM Analyzer


This code was developed in support of NASA GSFC MSESIIA contract. The code is released under NASA open source agreement “GSC-17514-1, HTML QCM Analyzer“. Copyright © 2015 United States Government as represented by the Administrator of the National Aeronautics and Space Administration. All Rights Reserved.

Bugs/Feature Requests

Please let me know if you find a bug or the analyzer does not load your file. Support for additional file formats can be added as needed. Below is a screenshot of the analyzer in action.

qcm analyzer
Figure 1. Screenshot of the QCM analyzer

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