Two=beam interferometer for fourier spectroscopy - has pivotable tilt=independent retroreflectors ensuring insensitivity to lateral retroreflector displacement

摘要

A two-beam interferometer with at least one measurement beam input has, arranged sequentially, a beam divider (3), two reflector systems, another beam divider (6) for mixing reflected partial beams and two detector systems (1, 2) for the mixed beams. At least part of one reflector system is movable to adjust the unmixed beams' path length. Both reflector systems have tilt-independent retroreflectors (7, 8) mutually dependently pivotable about an axis (12) outside their symmetry centre to produce equal beam offsets so the reflected beams arrive at the same point on the second divider. USE/ADVANTAGE - For use in Fourier specroscopy. Lateral retroreflector displacement causes no errors.