Abstract: A test device for determining the extinction value of a laser range finder having a laser transmitter and a laser receiver characterized by the device having an optical shield for shielding an unattenuated laser beam from the transmitter, a filter chamber containing attenuation filters being disposed in the optical beam path, a scatter unit having a dispersion disk having a scattering range for diffusely scattering the laser light, an optical coupling unit for coupling light into the laser receiver and at least one light waveguide line of a specific length having one end disposed in the scatter range of the dispersion disk and the other end for releasing the light traveling in the waveguide into an optical beam so that the laser light pulses from the transmitter are both attenuated and scattered prior to being coupled into the receiver. The test device enables checking the system sensitivity of laser range finders.

Abstract: An adjustment and test device for a laser ranging system or laser range finder which device is adapted for obtaining the parallel alignment of optical axes of the transmitter and receiver with respect to one another and with respect to the optical reference axis, characterized by a test unit, an optical adapter unit and a mechanical adapter unit. The test unit has a housing, a collimator, which comprises a collimator lens, a beam splitting cube with a reticule, a device for illuminating the reticule and a device for observing the illuminated reticule, and an arrangement for mounting the collimator in said housing for adjustment of the optical axis of the collimator in the housing. The optical adapter unit has an independent housing and has an arrangement for optically coupling the test unit to the laser ranging system which includes at least one movable optical coupling element for interconnecting an optical axis of the laser ranging system to the collimator axis.