| 摘要 |
A spectrometric measurement apparatus comprises a collimator (401), a first diffractive grating (403), a second diffractive grating (404), and a detector arrangement (407). Incident radiation (402) from the collimator (401) is diffracted to the detector arrangement (407) either directly or through mirrors so that the first (403) and second (404) diffractive gratings diffract different wavelength ranges.
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