Wedge angle

Missmatch between the axis of the cylinder and the mechanical center line

Twist between the axis of the cylinder in relation to the outer edge of the lens.

This function performs the measurement of the mismatch between the vertex line of the cylinder axis and a reference, usually the outer edge of the cylinder lens.

The specimen is positioned on the x/y-table on a stop. The measuring head is focussed on the cylinder axis, so that a reflex-image appears (a line).

The line position is measured highly accurately by the software.

Afterwards the specimen is rotated by 180° and positioned again at the stops on the table.

The mismatch results from the shift of the line position.

The measurement is possible also in transmission.

This function performs the measurement of the twist between the cylinder axis and a reference, usually the outer edge of the cylinder lens.

The measurement is performed by a manual sample movement.

The cylinder lens is positioned on the stop on the table. The measuring head is focussed on the cylinder axis, so that a reflex-image appears.

Afterwards the sample is moved on the table.

If there is a twist between the cylinder axis and the outer edge of the lens, the reflex image moves. The movement is measured very accurate depending on the measuring position. From this measurements the software calculates the twist angle.

The measurement is possible also in transmission.

 

 

PDF