The J-CAMP converter imports and exports spectral data to and from the DX exchange standard prepared by Robert S. McDonald. The J-CAMP standard has been adopted by a variety of vendors to export UV/VIS and NIR data. For complete specifications refer to Robert S. McDonald* and Paul A. Wilks, Jr., Applied Spectroscopy 42,151,1988. This standard has been periodically updated, and more complete information on the latest version can be obtained by contacting Mr. McDonald directly.
J-CAMP files are assumed to have .DX filename extensions. However, other extensions may be typed in when conversion is done. Most FT-IR spectrometer manufacturers support J-CAMP data. The format is useful for any XY data and need not be limited to FT-IR spectra. All products support J-CAMP's full ASCII Squeezed Difference Format for importing. Standard ordinate scaling is NOT required and Y values may be greater than 32,767 as long as ##MAXY= and ##MINY= are specified. Each spectra file comes from a separate J-CAMP section beginning with ##TITLE=. The ##END= may optionally be omitted from all but the last J-CAMP subfile. Multiple spectra may be imported from a single J-CAMP file, however each spectrum will be stored in a separate GRAMS data file (i.e., a multifile is NOT created). Instead, multiple spectra are imported as sequentially numbered single files. For example: NAME, NAME1, NAME2, NAME3 or S1, S2, S3, S4, etc. The J-CAMP Data Exchange format was created and is maintained by:
Robert S. McDonald
9 Woodside Dr.
Burnt Hill, NY 12027
In order to better support NIR and quantitative calibration sets, this converter supports import of "multi record" J-CAMP files into Thermo Electron multifiles. If the J-CAMP file is a link file, the ##BLOCKS= key is used to determine the number of spectra (subfiles) for the multifile. If there is a ##CONCENTRATIONS= label list, then a GRAMS Calibration File List (CFL) is created in the same directory using the same base name as the import file.
On export, if a CFL file is found in the same directory with the same base name as the SPC file, the concentration information will be exported along with the spectral data. Note that the number of subfiles in the multi-file and the number of spectra listed in the header of the CFL file must match. Otherwise, only the spectral data is exported.
The new ActiveApp program Active Multifile Tool can be used to create a multifile from the single data files.
Some J-CAMP files (esp. those from NIR instruments) can contain concentration or calibration information. G-PLSPlus can read the concentration information, and can automatically create the .CFL calibration list file. This is available in the Utilities/Import menu. The spectral data must be imported into GRAMS format first using the GRAMSC32 Convert program. This will build the single spectra back into a multifile. |
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