adj_intens: Adjust spectral intensities to absorbance units.

In OpenSpecy: Analyze, Process, Identify, and Share Raman and (FT)IR Spectra

Adjust spectral intensities to absorbance units.

Description

Converts reflectance or transmittance intensity units to absorbance units.

Usage

adj_intens(x, ...)

## Default S3 method:
adj_intens(x, ...)

## S3 method for class 'OpenSpecy'
adj_intens(x, type = "none", make_rel = TRUE, ...)

Arguments

x	a list object of class OpenSpecy.
type	a character string specifying whether the input spectrum is in absorbance units ("none", default) or needs additional conversion from "reflectance" or "transmittance" data.
make_rel	logical; if TRUE spectra are automatically normalized with make_rel().
...	further arguments passed to submethods; this is to adj_neg() for adj_intens() and to conform_res() for conform_intens().

Details

Many of the Open Specy functions will assume that the spectrum is in absorbance units. For example, see subtr_baseline(). To run those functions properly, you will need to first convert any spectra from transmittance or reflectance to absorbance using this function. The transmittance adjustment uses the log(1 / T) calculation which does not correct for system and particle characteristics. The reflectance adjustment uses the Kubelka-Munk equation (1 - R)^2 / 2R. We assume that the reflectance intensity is a percent from 1-100 and first correct the intensity by dividing by 100 so that it fits the form expected by the equation.

Value

adj_intens() returns a data frame containing two columns named "wavenumber" and "intensity".

Author(s)

Win Cowger, Zacharias Steinmetz

See Also

subtr_baseline() for spectral background correction.

Examples

data("raman_hdpe")

adj_intens(raman_hdpe)

OpenSpecy documentation built on Sept. 14, 2024, 9:07 a.m.