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Ellis, J.D. (author), Spronck, J.W. (author)A compact, balanced, up to three degrees of freedom measuring interferometer which enables fiber delivery of an optical source without periodic nonlinearity, an interferometer system, and method for using an interferometer to measure up to three degrees of freedom is disclosed.patent 2013
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Joo, K.N. (author), Ellis, J.D. (author), Spronck, J.W. (author)Laser interferometer comprising a laser light source providing at least one light beam at two distinct frequencies, a beam splitter for splitting the at least one light beam into reference and measurement beams, a first reflector and a second reflector for reflection of the reference and measurement beams, and at least one detector for detection...patent 2010
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Van Schieveen, J.P. (author), Spronck, J.W. (author)The invention relates to an actuator for positioning an object in a first direction of movement, comprising a base, at least three positioning members, wherein each of the at least three positioning members has a contact surface which is configured to bear against the object under prestress, and a control device to drive the at least three...patent 2010
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Nijsse, G.J.P. (author), Spronck, J.W. (author)There is described a support system enabling supporting an object such as a platform (1) free from vibration, in that bearing elements (50) have a stiffness (k) which at a working point (z0) equals zero. A bearing element (50) comprises two magnetic couplings (51, 52) provided by permanent magnets (61, 63). One coupling (51) has a positive...patent 1999