Carl Zeiss PERAVAL INTERPHAKO

is a high-precision interference microscope from the MIKROVAL series designed for work in transmitted light with a wide range of applications. With the INTERPHAKO head, unstained microscopic samples can be contrasted by various methods and their path difference can be measured with high precision with an accuracy of up to lambda/500.

Conventional bright-field corrected objectives with infinite focal length up to the highest apertures can be used with the instrument. The basic equipment includes five planachromat lenses corrected to large field of view. The magnification range for this particular microscope is 50 to 2016× (basic equipment 63 to 1575×).

PERAVAL INTERPHAKO allowed the use of a Mach-Zehnder interferometer located behind the intermediate imaging system and a set of different phase contrasts, whereas the microscope we own includes only the phase contrast set.

The illumination is provided by an aplanatic-achromatic condenser, which is ingeniously designed for easy centering and continuous adjustment of the Köehler illumination using phase contrast. The condenser carries a slot to allow quick replacement of the phase revolver with an interference revolver or slit attachment for the Shearing method.

Thanks to the possibility of centering the lens revolver and the complete optical path of the condenser, the phase rings can be perfectly centered, allowing a smooth change of lenses without the need for additional centering of the rings.

At the same time, the INTERPHAKO head incorporates built-in Bertrand optics which allow the rear focus plane of the lens and condenser to be observed.