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Imports infrared spectra from Thermo Galactic's files

Source: R/ir_import_spc.R
ir_import_spc.Rd

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.

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.

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.

Examples

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