| 摘要 |
An optical apparatus for total internal refflection spectroscopy comrises: a transparent body 815) having an internally reflective surface (16), at least one source of electromagnetic radiation (10) for providing at least on beam of collimated electromagnetic radiation (19); optical scanning means (13, 14) for directing the beam or beams to the transparent body so that the radiation is internally reflected at the reflective surface (16), and sequentially or continuously scanning the incident angle of the radiation over an angular range; at least one detector for detecting electromagnetic radiation exiting the transparent body; and means (13, 14, 17, 18) for counteracting variation of the irradiance in the illuminated area of the surface during the angular scan, or the effect of such variation on the reflected beam or beams. An optical apparatus for examining thin layer strutures on the surface for differences in respect of optical thickness and/or refractive index, and a method for total internal reflection spectroscopy are also disclosed.
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