PubMed · 3858175
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J Craigon, C P Gibson. 1985. An interchangeable simple-hinge articulator.. https://pubmed.ncbi.nlm.nih.gov/3858175/
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Two six-degrees-of-freedom sensing methods are presented. In the first method, three laser beams are employed to set up Descartes' frame on a rigid body and a screen is adopted to form diffuse spots. In the second method, two superimposed grid screens and two laser beams are used. A CCD camera is used to take photographs in both methods. Both approaches provide a simple and error-free method to record the positions and the attitudes of a rigid body in motion continuously.