Operation Principle
A precision flat is put on the selected spherometer ring. This is the reference (zero) position for the subsequent sample measurement. In the second step the lens or test plate is put on the ring. The spherometer measures the saggital height of the curved surface of the lens. The radius of curvature can be quickly derived using the relationship between sag and radius:
The values of D and d are determined with extreme accuracy during the calibration procedure and are certified in the individual calibration sheet supplied with the instrument. |
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