Apparatus for determining the distance between a measuring surfa

Details Apparatus for determining the distance between a measuring surfa Apparatus for determining the distance between a measuring surfa

1986-09-29

1988-05-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356 4, G01J 120

Patent

active

047483229

ABSTRACT:
An apparatus for the highly accurate measurement of measuring surfaces (14) has a lens (68) pre-tensioned by spring members (84, 86), which lens is connected to a magnetic adjusting sleeve (74). The latter cooperates with an annular coil (140) surrounding it. A light source (60) directs a narrow light beam (62) towards the measuring surface (14). The beam reflected by the latter is deflected by a combination prism (90) and split into two partial beams, which reach photoelectric transducers (116, 118). The output signal thereof serves for adjusting the supply current for the annular coil (140). Provided behind the lens (68) is a glass plate (78) which is mirrored with the exception of a central circular region (82), so that light beams reflected by the measuring surface with a considerable inclination with respect to the axis of the apparatus are thrown back again onto the measuring surface and are supplied to the detection system along the axis of the apparatus.

REFERENCES:
patent: 4433235 (1984-02-01), Akiyama et al.
patent: 4527893 (1985-07-01), Taylor
patent: 4572607 (1986-02-01), Krizik
patent: 4592829 (1986-06-01), Neumann et al.
patent: 4600299 (1986-07-01), Abshire
patent: 4620089 (1986-10-01), Schlichting et al.

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