raman-fitting

A Python framework that performs a deconvolution on typical parts of interest on the spectrum of carbonaceous materials. The deconvolutions are done with models which are composed of collections of lineshapes or peaks that are typically assigned to these spectra in scientific literature.

In batch processing mode this framework will index raman data files in a chosen folder. First, it will try to extract a sample ID and position number from the filenames and create an index of the files in a dataframe. Over this index a preprocessing, fitting and exporting loop will start. There are several models, each with a different combination of typical peaks, used for fitting. Each individual typical peak is defined as a class in the deconvolution/default_peaks folder with some added literature reference in the docstring. Here, the individual peak parameter settings can also be easily adjusted for initial values, limits, shape (eg. Lorentzian, Gaussian and Voigt) or be fixed at certain initial values. Export is done with plots and excel files for the spectral data and fitting parameters for further analysis.

Example plots

https://github.com/MyPyDavid/raman-fitting/wiki

Installation

A release is now available on PyPI, installation can be done with these commands in a terminal.

# Setting up and activating a virtual environment
python -m venv testenv
source /testenv/bin/activate

# Installation from PyPI
python -m pip install raman_fitting

From source installation

The following shows how to install the package from this source repository. Download or clone this repository in a certain folder.

git clone https://github.com/MyPyDavid/raman-fitting.git

# set up and activate venv ...

# regular install
python -m pip install raman-fitting/

# editable/develop mode
python -m pip install -e raman-fitting/

Usage

Post installation test run

In order to test the package after installation, please try the following cli command in a terminal

raman_fitting -M make_examples

or these commands in the python interpreter.

import raman_fitting
raman_fitting.make_examples()

This test run should yield the resulting plots and files in the following folder. Where home means the local user home directory depending on the OS.

home/.raman_fitting/example_results

Fitting your own datafiles

Place your data files in the default location or change this default setting in the config.

home/.raman_fitting/datafiles

The following command will attempt the indexing, preprocessing, fitting and plotting on all the files found in this folder.

# default run mode is "normal" means over all the files found in the index
raman_fitting

# If you add a lot of files, try to check if the index is properly constructed
# before fitting them.
raman_fitting -M make_index

# Location of index
home/.raman_fitting/datafiles/results/raman_fitting_index.csv

Datafiles

The raman data files should be .txt files with two columns of data values. The first column should contain the Raman shift values and the second one the measured intensity. Filenames will be parsed into a sampleID and position, in order to take the mean of the measured intensity of several positions on the same sample.

An example of filename formatting and parsing result:

samplename1_pos1.txt => sampleID = 'samplename1', position = 1
sample2-100_3.txt => sampleID = 'sample2-100', position = 3

Version

The current version is v0.6.15

Dependencies

• python >= 3.7
• lmfit >= 1.0.0
• pandas >= 1.0.5
• scipy >= 1.4.1
• matplotlib >= 3.1.2
• numpy >= 1.19.2