Measuring Radius of Curvature of Optical Surfaces
An essay from Apre Instruments describes the multiple methods used today to measure an optical surface radius:
- Test plates
- Mechanical probe
- Interferometer “Cateye to Confocal”
The essay then discusses the benefits of Apre’s Spectrally Controlled Interferometry (SCI) measurement method, including:
- Easy alignment in laser mode
- Electronically switch to white light mode to isolate fringes to the surface of interest
- Measuring the cavity phase electronically (no mechanical motions)
- Measuring the absolute distance of the measured cavity
SCI promises to replace traditional catseye-confocal lens surface radius measurement by saving time and greatly improving accuracy. It is the go to method for high-performance lens radius metrology.
To read the entire essay, click here.
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