Polariscope
Polariscope describes an optical arrangement of polarization filters with which, for example, stresses in the glass can be made visible. It is used in particular when examining precious and semi-precious stones, which are rotated 90 degrees in the polariscope between two polarization filters. Classifications can be carried out quickly ( isotropy , birefringence, etc.) and possibly forged stones can be identified. In the second half of the 20th century, polariscopes were in use in all large companies. At the end of the century, however, the finite element method increasingly took over the calculation of stresses in bodies. But even today, polariscopes are still used during the training of engineers in order to better understand stresses in bodies. In this way, notch effects or stress peaks in bores can easily be illustrated. In addition, the devices in the plastics and glass industry to check the stress state of components and z. B. Windshields used.
