Linearity test performance Appendix C Spectroscopy Background
56 AA003700-01 rev. G. 2.0
A more demanding (and realistic) test is to permit a mixture of high transmittance
and near zero transmittance within the same spectrum. This is achieved with a
Polystyrene film of at least 75 μm thickness where there are 6 bands that have
absorbance greater than 4 (less than 0.01% transmittance) while many parts of the
spectrum are quite transparent.
Linearity test performance
When testing an FTIR with a Polystyrene film, the 6 highly absorbing bands should
show close to zero transmittance. A satisfactory performance would indicate a
residual transmittance of less than 0.1%. It would permit quite linear performance
over the absorbance range from 0 to 2 A.
Figure C- 3. Transmittance spectrum of polystyrene film indicating the 6 total absorbing bands
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