adj_intens: Adjust spectral intensities to standard absorbance units.

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

Adjust spectral intensities to standard absorbance units.

Description

Converts reflectance or transmittance intensity units to absorbance units and adjust log or exp transformed units.

Usage

adj_intens(x, ...)

## Default S3 method:
adj_intens(x, type = "none", make_rel = TRUE, log_exp = "none", ...)

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

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().
log_exp	a character string specifying whether the input needs to be log transformed "log", exp transformed "exp", or not ("none", default).
...	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 April 3, 2025, 9:58 p.m.