ir_import_spc {ir}

Imports infrared spectra from Thermo Galactic's files

Description

ir_import_spc imports raw infrared spectra from a Thermo Galactic's .spc file or several of such files. ir_import_spc is a wrapper function to hyperSpec::read.spc().

Usage

ir_import_spc(filenames, log.txt = TRUE)

Arguments

filenames

A character vector representing the complete paths to the .spc files to import.

log.txt

A logical value indicating whether to import metadata (TRUE) or not (FALSE). See the details section. If set to FALSE, only the metadata variables exponentiation_factor to measurement_device listed in the Value section below are included in the ir object.

Details

Currently, log.txt must be set to FALSE due to a bug in hyperSpec::read.spc(). This bug fill be fixed in the upcoming weeks and currently can be circumvented by using the development version of 'hyperSpec'. See https://github.com/r-hyperspec/hyperSpec/issues/80.

Value

An object of class ir containing the infrared spectra extracted from the .spc file(s) and the metadata as extracted by hyperSpec::read.spc(). Metadata variables are:

scan_number

An integer value representing the number of scans.

detection_gain_factor

The detection gain factor.

scan_speed

The scan speed [kHz].

laser_wavenumber

The wavenumber of the laser.

detector_name

The name of the detector.

source_name

The name of the infrared radiation source.

purge_delay

The duration of purge delay before a measurement [s].

zero_filling_factor

A numeric value representing the zero filling factor.

apodisation_function

The name of the apodisation function.

exponentiation_factor

The exponentiation factor used for file compression.

data_point_number

The number of data points in the spectrum

x_variable_type

The type of the x variable.

y_variable_type

The type of the y variable.

measurement_date

A POSIXct representing the measurement date and time.

measurement_device

The name of the measurement device.

Examples

# import a sample .spc file
x <-
  ir::ir_import_spc(
    system.file("extdata/1.spc", package = "ir"),
    log.txt = FALSE
  )