| 摘要 |
The photodiode array spectrometer has diffraction devices (10) which generate from a polychromatic beam a diffracted beam with a number of spatially separated diffracted rays of different wavelengths. A photodiode array (11) receives the diffracted beam and (lambda 1, lambda 2, lambda 3), each photodiode intercepts a different spectral portion of the beam. A rotatable transparent plate (8) is provided in the beam path in front of the diffractors (10) which, due to refraction of the beam upon entering and leaving the plate (8), permits to vary the direction of the beam impinging on the diffractions and therefore the direction of the diffracted beam in small steps depending on the angle of rotation of the plate (8).
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