| 摘要 |
<p>An interferometer which is less susceptible to tilt than usual comprises a monochromatic light source (1) emitting a light beam (13) which passes through a first quarter wave plate (2) and is incident on a first beam-splitting means (5). The latter means (5) produces two partial beams, namely a reference beam (15) and a measuring beam (16). First and second beam reflecting means (6, 7) reflect the reference and measuring beams back to the beam-splitting means (5) where there interfere. The interfering measuring beam and reflecting beam, which constitute a first homologous beam couple, are directed by the first beam-splitting means (5) to a second beam-splitting means (8) which splits them into a second, deviated homologous beam couple (15'', 16'') and a third homologous beam couple (15', 16') which are detected by respective photodetectors (12, 11). The active photo-electric faces of the photodetector (12, 11) are aligned relative to the homologous beam couples (15'', 16'' and 15', 16') respectively and are displaceable. <IMAGE></p> |
