CWA 18133:2024

Raman instruments calibration and verification protocols CWA 18133:2024

Scope

This CEN Workshop Agreement (CWA) provides a data harmonization protocol for Raman instruments that allows:
- Calibration adjustment of data and instruments already calibrated by the manufacturer;
- Calibration of instruments without any previous calibration;
- Verification of the calibration for instruments that were calibrated with this protocol in the past.
The protocol consists of the following calibration and verification stages: x-axis positions, x-axis resolution and y-axis relative intensity correction. In addition to the use of the full protocol to harmonize an instrument, independent sections of the protocol can be used to verify/calibrate certain qualities (x-axis calibration, resolution, or y-axis calibration) of the instrument.
The protocol is applicable to any kind of Raman instrument within the boundaries described in chapter 5. Primary use of this protocol is for fixed grating dispersive spectrometer systems. In scanning spectrometer systems, the exact settings of the scanning are to be considered as part of the optical path.
The protocol may have application beyond the boundaries stated, such as systems using 514.5 nm or 633 nm excitation sources, but it has been developed using only 532 nm and 785 nm instruments, and as such its effectiveness with other excitation wavelengths is unconfirmed.
NOTE Term ‘calibration’ can have legal meaning in a metrology environment, this is not the focus of this CEN Workshop Agreement.