Aberration, optical contributions

Optical Considerations. The objective of this investigation was to determine the amount of water in coexisting phases of the C10PO system. The value of the data is therefore determined by the instrument s photometric accuracy. Several factors which contribute to photometric inaccuracies in infrared microspectroscopy include sample geometry, spherical aberrations caused by the introduction of... 

Recently, a new comprehensive approach to calculate the total instrumental function has been proposed,in which all aberration effects are treated simultaneously in the same manner. The method is based on an exact analytical solution, derived from diffraction optics, for the contribution of each incident ray to the intensity registered by a detector of finite size. 

The demagnification of the source is important if the sample size and source size are widely different. The practical focus width has contributions from aberrations (very small for Bragg focussing optics) and spectral smearing (the latter is quite small for perfect crystals but large for mosaic graphite), i.e. 

Optical alignment, aberrations, and prism grating properties all contribute to errors in measuring transmittance. 

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