| 摘要 |
Disclosed is a spectrometric instrument (2) comprising a scanning interferometer (4,6,8), a monochromatic optical radiation source (12) and an observation optical radiation source (16). The interferomenter has a beamsplitter (4) for dividing incident optical radiation into a reflected beam and a transmitted beam. The monochromatic optical radiation source (12) is arranged to launch a reference beam into the interferometer (4,6,8) along a first propagation path (14) to be initially incident on a first face (4’) of the beamsplitter (4). The observation optical radiation source (16) is arranged to launch an observation beam (18) into the interferometer (4,6,8) along a second propagation path (20) to be initially incident on the first face (4’) of beamsplitter (4) and overlap the reference beam at the first face (4’). The radiation sources (12,16) cooperate to generate a first angle (Θ) between respective first (14) and second (20) propagation paths at the first face (4’) which is larger than a divergence half-angle (α) of the observation beam (18). |
