One of the tools needed to run the Ronchi test is the namesake grating. This is a series of opaque parallel lines spaced equally so you have a spatial frequency that can go from 4 at 8 lines per mm. A pattern less frequently can be used if you must test […]
As regards the control of the optical mirror, simplest and most widely used tests, especially at the amateur level, is definitely the Ronchi Test. This test uses a beam of light is sent and then reflected from the primary mirror, which is passed through a reticle with a series of low-frequency […]
When you run the Ronchi test, often you find yourself having to do with figures of shadowy lines that may differ from those that usually are presented to explain the most common defects in optical machining. Here you need a general method able to explain the behaviour of any line […]
