Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1993-06-22
1995-02-07
Turner, Samuel A.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356358, 409179, 414749, G01B 902
Patent
active
053879694
ABSTRACT:
Positions of the spindles (116-124) of a multi-axis drilling machine (130,132,140,142) are precisely measured by three scanning laser beams (165,167,169). The scanning laser beams are swept in oscillating sweeps across areas of motion of each of three corner reflectors (160,162,164) that are fixedly mounted to an unguided spindle carrying structural beam (132) that is driven by three screw actuators (150,152,154). Each scanning laser beam is projected from a fixed reference position and tracks one of the corner reflectors. Each beam locks onto its associated corner reflector, and, while locked on, an interferometer (180,190,198) measures incremental changes of the distance between each scanning mirror (166,168,170) and its corner reflector. Three measured distances (C1, C2, C3) between the respective corner reflectors and three reference positions from which the three laser beams are projected enable calculation of the position of the moving corner reflectors, and, therefore, the related drilling spindles relative to a reference system.
REFERENCES:
patent: 4417843 (1983-11-01), Bonga
patent: 4714339 (1987-12-01), Lau et al.
Optima Industries, Inc.
Turner Samuel A.
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