Using the Raman IdentiCheck . 57
Calibration and Performance Verification SOPs
Several different automated calibration routines are included in the software:
•
Wavelength (x-axis) calibration uses the position of precisely known lines in a neon
emission spectrum to calibrate the detector.
•
Laser frequency determines the exact laser wavelength.
•
Intensity (y-axis) calibration is performed using coated glass with a well characterized
emission spectrum. This is used to correct for non-linearity in detector response.
An additional wavelength calibration verification routine has been included in the software,
which compares a series of peaks for polystyrene (ASTM E 1840) with values collected using
a polystyrene sample. These calibration/validation tests allow for in-house instrument
performance verification.
Intensity calibration is only performed as part of an annual service, or following a service
repair of the instrument.
Backgrounds are always collected during a calibration procedure. The background measures
the bias and dark signal over the selected area of the CCD. This is a necessary part of the
calibration routines, so it is always performed.
The spectrometer has no moving parts in its detection system; therefore frequent calibration
is not necessary.
We recommend that you calibrate the instrument in accordance with the following SOP.
SOP-5: Calibration/Performance Verification
We recommend that wavelength calibration verification is performed on a regular basis to
ensure that the instrument is performing within specification. This can be once a day or once
a week depending on your requirements and the environment in which the instrument is
used.
IMPORTANT: If the instrument passes the wavelength calibration verification procedure,
the instrument is optimized for performance and does not require wavelength calibration.
When carrying out the calibration/verification procedures, the instrument laser power should
be set to 100% and the Data Interval to 2 cm
−1
or smaller.
It is very important to ensure that the data does not include contributions from any
substance other than your sample. Refer to
SOP-4: Collecting a Spectrum with a Triggered
on page 56.
We recommend the use of the Final Test Sample Plate Assembly (part number L1320229) in
conjunction with the Probe Sample Mount (part number L1320309) for mounting the samples
used in these calibration/verification procedures.
On completion of the wavelength calibration verification, the result of the verification
procedure is displayed. A spectrum detailing the outcome of the verification (or calibration)
procedure is saved to the folder …\pel_data\config\Raman\Calibration Files\Logs with the
filename Calibration Report [Name of calibration][Date].sp
Содержание Raman IdentiCheck
Страница 1: ...Raman IdentiCheck Getting Started Guide MOLECULAR SPECTROSCOPY ...
Страница 5: ...Introduction ...
Страница 10: ...10 Raman IdentiCheck Getting Started Guide ...
Страница 11: ...Safety Practices ...
Страница 26: ...26 Raman IdentiCheck Getting Started Guide ...
Страница 27: ...Raman History Theory and Instrumentation ...
Страница 34: ...34 Raman IdentiCheck Getting Started Guide ...
Страница 35: ...Introduction to the Raman IdentiCheck ...
Страница 50: ...50 Raman IdentiCheck Getting Started Guide ...
Страница 51: ...Using the Raman IdentiCheck ...
Страница 65: ...Maintenance and Troubleshooting ...
Страница 73: ...Appendix A Using your own PC ...
Страница 78: ...78 Raman IdentiCheck Getting Started Guide ...