Mirror 1, mounted in the sensor housing by means of flat spring
2, bears against measuring spindle 3. A beam of lig h t from source
4 is reflected by mirror 1 to phototube 5. The position of m ir ror
1, turned by spindle 3, depends upon the size of workpiece
a th at the spindle contacts. The intensity of illu m in a tio n of
phototube 5 and, consequently, the electric current excited
by the phototube depends upon the position of mirror 1, i.e.
on the size of workpiece a.
$4373$SmE,M$