By way of arranging the output end (6) of the optical fibre bundle as an optical slit (8) and providing same fixedly on the incident optical path of the dispersion element (3) and directly using same as the incident slit of the spectrometer, the energy loss of the sampling optical signal can be greatly reduced, and the sensitivity of the spectrometer can be improved significantly, thus reducing the non-linearity, dark noise and stray light errors of the spectrometer, and enabling the spectrometer to have higher measurement accuracy and faster measurement speed.
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