Harvard Link Engineering ICOSfit
Data analysis tools for absorption spectroscopy
ICOSfit is a non-linear least-squares fit algorithm originally developed for processing data from the Anderson Group's ICOS instruments. It has since been extended to support other optical configurations, such as Herriott Cells.
The current version of ICOSfit is V4.3.1, released April 21, 2022.
This archive consists of the following:
- icosfit: The core ICOSfit fitting program
- Matlab/ICOSfit: a suite of Matlab support utilities for working with ICOSfit and scan data
icosfit
icosfit is a C++ program for fitting spectra from scanning laser spectrometers. In its ICOS mode, it specifically understands and compensates for the lineshape perturbations caused by integrated cavity output spectroscopy (ICOS). The ICOSfit Manual describes the data formats and the syntax required by the icosfit program. Most users will take advantage of the Matlab support utilites in the Matlab/ICOSfit directory. These can go a long way toward performing many of the routine operations in setting up your data analysis.
That said, these programs have a large number of options, tweaks, knobs and buttons, and not all of them have been documented. If you would like help getting started, please submit an issue.
V4.0.0 represents a significant rewrite from earlier versions in order to take advantage of a more sophisticated Levenberg-Marquardt library. This version uses the levmar library, developed by M.I.A. Lourakis (bibtex entry).
If you use ICOSfit in your published work, please reference/acknowledge the DOI at the top of this document as well as the levmar library.
Matlab/ICOSfit
The Matlab/ICOSfit routines provide tools for interactively viewing scan data, analyzing optical etalon data and setting up the configuration files necessary to run icosfit. It is entirely possible to use icosfit without Matlab. Contact the author if you are looking for alternatives.
Installation
Binary packages are available for Cygwin and MacOS. Please contact the author for more information.
Compiling
Details on compiling icosfit from source can be found in BUILD.md.
Troubleshooting
If you encounter problems, please consider submitting an issue on GitHub or send an email to the author.
Contact
icosfit was written by Norton Allen.