Patent ID: 6949733
Filing Date: 2005-09-27
Classification: G05B

Abstract:
1. A position measurement system for determining the position of a working point ( 8 ) relative to a working space ( 9 ), the position measurement system including at least first and second measurement modules, the first measurement module being capable of providing measurements of a first set of displacements of the working point relative to an intermediate component ( 3 ), the first set of measured displacements including a relatively large displacement (X) in a first linear degree of freedom and relatively small displacements (Y 1 ′, Y 2 ′) in at least two of the five degrees of freedom other than the first, the second measurement module being capable of providing measurements of a second set of displacements of the intermediate component relative to the working space, the second set of measured displacements including a relatively large displacement (Y 1 ) in a second linear degree of freedom, the second degree of freedom being different from the first, the second set of measured displacements also including relatively small displacements (X 1 , X 2 ) in at least two of the five degrees of freedom other than the second.