Fiber optic bundle 12, entrance slit 14, first concave grating 16, middle slit 18, second concave grating 20, and measurement or recording system 32 are all oriented perpendicular to the plane in which they lie. 4 and 5, optic bundle 12, entrance slit 14, first concave grating 16, middle slit 18, second concave grating 20, and measurement or recording system 32 have centers which all lie in the same plane. In accordance with the preferred embodiment, middle slit 18 is oriented parallel to and on the focal point of the spectrum produced by grating 16, allowing for easy adjustment.Īs can be seen clearly in FIGS. Middle slit 18 is oriented with its edges defining those points on the spectrum associated with the upper and lower wavelength ranges of the spectrum produced by grating 16. Grating 16 is oriented parallel to grating 20 or at an angle 37 determined by and specific to the grating 16 employed, with the optical axis of grating 16 parallel or at an angle 37 to the optical axis of grating 20.
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