| 摘要 |
Disclosed is a sensor device for measuring distances according to the principle of confocal microscopy, comprising an approximately punctiform first aperture for a transmitted light beam and at least one second aperture as a receiving aperture arranged concentrically to the first aperture. Both apertures use a joint lens provided with a collimator and a focussing element. By positioning the second aperture away from the optical axis and positioning the first aperture exactly on the optical axis, the light received via the second aperture and reflected by the object to be measured contains a minimum of intensity when the object surface 2 is exactly in the focal point of the viewed light wavelength. The wavelength of the light that is not received by the second aperture acts as an identifier for the distance between the sensor and the measuring point of the object surface when multichromatic light is used and the lens provided with the collimator and the focussing element has sufficient longitudinal chromatic aberration.
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