Device for determining the influence of dispersion on a measurement
AssigneeLeica Geosystems AG
InventorsPaul Benz, Jürg Hinderling
Life of this patent
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Abstract
A device determines and subsequently corrects the dispersive influence on a measurement made according to the principles of phase or pulse modulation along a visible range. The device has an element for emission of electro-magnetic radiation with two carrier wavelengths in the border regions of the visible spectrum. After passing through a volume of atmosphere to be probed, and reflection, the radiation is received and the dispersive influence, for instance, on the distance measurements, is calculated and corrected.
Claims12
A device for determining the dispersive influence of a measurement, in particular a measurement of distance, along a path according to the principles of phase or pulse modulation, comprising:
- means for emission of electromagnetic radiation with at least two carrier wavelengths,
- means for reception of the at least two carrier wavelengths,
- means for travel time measurements of the at least two different carrier wavelengths along the path,
- means for calculating the dispersive influence on the measurement from the at least two measured travel times, wherein the means for emission are so designed that they will at least, in the form of at least a first semiconductor laser, emit a first carrier wavelength in the infrared or red wavelength region, and in the form of at least a second semiconductor laser, emit a second carrier wavelength in the violet wavelength region.
Dependencies are inferred from the claim text.