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The world's largest sensor portfolio for precise measurement tasks
The world's largest sensor portfolio for precise measurement tasks
The confocalDT sensors product range stands for the highest precision and dynamics in confocal chromatic measurement technology. These sensors enable high-precision and fast measurements for both distance and thickness measurements of transparent objects. In addition, innovative controller and sensor technologies ensure high signal stability on all surfaces. The high-performance sensor portfolio enables the solution of a wide range of measurement tasks, e.g., in flat glass production, in measuring machines and in semiconductor machine construction.
Polychromatic white light is focused onto the target surface by a multi-lens optical system. The special lens arrangement splits the white light into monochromatic wavelengths by controlled chromatic aberration. To each wavelength, a specific distance is assigned by factory calibration. Only the wavelength which is exactly focused on the target is used for the measurement. An optical arrangement images the light reflected onto a light sensitive sensor element. This sensor element detects the corresponding spectral color and evaluates it. In the case of multi-peak measurements, several distance points are evaluated accordingly.
If the object to be measured is transparent, the light is reflected both by the surface and by the underlying surface. The spectrometer separately detects the two reflected colors. If the refractive index of the measured object (e.g. glass) is known, the distance between the two surfaces can be calculated and output.
