Active retroreflector with in situ beam analysis to measure the rotational orientation in conjunction with a laser tracker
2013
High precision optical non-contact position measurement is a key technology in modern engineering. Laser trackers (LT)
can determine accurately x-y-z coordinates of passive retroreflectors. Next-generation systems answer the additional
need to measure an object‘s rotational orientation (pitch, yaw, roll). These devices are based either on photogrammetry
or on enhanced retroreflectors. However, photogrammetry relies on costly camera systems and time-consuming image
processing. Enhanced retroreflectors analyze the LT‘s beam but are restricted in roll angle measurements. In the past we
have presented a new method [1][2] to measure all six degrees of freedom in conjunction with a LT. Now we dramatically
optimized the method and designed a new prototype, e.g. taking into consideration optical alignment, reduced power
loss, highly optimized measuring signals and higher resolution. A method is described that allows compensating the
influence of the LT’s beam offset during tracking the active retroreflector. We prove the functionality of the active
retroreflector with the LT and, furthermore, demonstrate the capability of the system to characterize the tracking behavior of a LT. The measurement range for the incident laser beam is ±12° with a resolution of 0.6".
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