Väisälä test - Zonal interferometry

This page is devoted to Väisälä test - aka zonal interferometry
One of the first attempts to record Väisälä interference with web-camera attached to tester

Tester was set up to zero position. I started recording and turned the tester handwheel all through 50 millimeters of measuring range.
Tester set up to zero position, web camera without lens mounted on eyepiece holder.
Test mask on mirror.
Outer mask removed to show measuring scale for adjusting mask.

Second series of Väisälä interference photos with measurement values

Home page
Atm page