Patent ID: 6411371
Filing Date: 2002-06-25
Classification: G01S

Abstract:
A device for optoelectronic measurement of distances between the device and non-cooperative target objects, which have a surface scattering a radiation beam, and cooperative target objects, which have a target mark reflecting a radiation beam in a directed manner, in geodetic and industrial surveying, comprising:a) a transmitter unit for alternative emission of a first radiation beam lying in the visible wavelength range and a second radiation beam lying in the wavelength range extending from visible to infrared, for the measurement of distances to the target objects; b) optical input elements for aligning the radiation beams generated by the transmitter unit with the target objects; c) a single transmitting and receiving lens having two functions, a first function for transmitting the first radiation beam aligned by the optical input elements, with a small, diffraction-limited beam divergence with respect to the non-cooperative target object, and for transmitting the second radiation beam aligned by the optical input elements, with a large beam divergence with respect to the cooperative target object, and a second function for receiving the radiation beams reflected or scattered by the target objects and for focusing said beams onto a detector unit comprising at least one optoelectronic detector for detecting said beams and producing detector signals; d) first selection means coordinated with the transmitter unit and intended for controlling the alternative emission of the first and of the second radiation beam; and e) a control and evaluation unit for controlling the first selection means and for determining the distance by evaluation of the detector signals.