Polystyrene Wavenumber - NPL Branded Standard
This calibration standard is suitable for the validation of the wavenumber scale of IR spectrometers.
Each transfer standard is individually calibrated at NPL and consists of a selected polystyrene film, matt finished on both surfaces and nominally 35 µm thick, mounted in a cardboard frame with a circular window about 25 mm in diameter. The card mount is 50 mm wide to fit the sample holder of most commercially available spectrometers.
The standard is supplied with a certificate of calibration showing calibrated transmittance minima (absorption peaks) at wavenumbers around 3060, 2850, 1944, 1601, 1583, 1154 and 1028 cm-1. This service is UKAS accredited.
The uncertainties of calibration at the 95% confidence level quoted on the calibration certificate are ± 0.4 wavenumbers for the transmittance minima around 3060, 2850 1154 and 1028 cm-1, ± 0.5 wavenumbers for the transmittance minima around 1601 and 1583 cm-1 and ± 0.6 wavenumbers for the transmittance minima around 1944 cm-1.
The calibrations will be fully valid for all resolutions of 4 wavenumbers or better, and will only be marginally affected by use of a resolution of 8 wavenumbers. Resolutions of worse than 8 wavenumbers will involve some increase in uncertainties.
Contact
Customer Service tel: +44 20 8943 6151
E-mail: optical_enquiries@npl.co.uk