The phase-schifting schlieren
“The schlieren technique is a popular for depicting deviations in light beams induced by density or temperature gradients in a fluid, surface shape, deformation, etc.1 The technique has many applications, in particular, fluid physics, flow illustration, and jet_arc characterization. Its success is due to its relative easy of implementation, low cost, use of conventional light sources, and high and variable sensitivity.”
From L. Joannes, F. Dubois, JC. Legros, Phase-shifting schlieren: high-resolution quantitative schlieren that uses the phase-shifting technique principle, Applied Optics Vol. 42, No. 25, 1 September 2003
Relevant for the
- NIMO TR0815 – High-resolution power mapper & wavefront analyser
- NIMO MATRIX – Up to 121 IOLs measured in a single click !
The Modulation Transfer Function (MTF)
The MTF is an important support to objective assessment of the image-forming capability of optical systems. Beyond providing a means of expressing objectively and quantitatively the imaging quality of optical systems, the MTF can be calculated from the lens design data.
In this way it allows optical designers to predict reliably the performance of IOL. Ultimately, the image quality of the manufactured lenses can be compared with the design expectations.
Relevant for the PMTF