| 摘要 |
A diffractive optical element device for use in spectroscopy, where broadband light is emitted from a light source ( 31 ) towards the optical element ( 24 ) and from there is transmitted to at least one detector ( 29; 29 '). The optical element has a plurality of diffractive dispersively focusing patterns, preferably partly integrated into each other, whose respective centers are two-dimensionally offset relative to each other in order to produce a plurality of spectra ( 25-28 ), where at least two are separate, but offset relative to each other and/or partly overlapping. In an alternative embodiment, the optical element consists of either one diffractive optical element ( 60 ) that is related to a wavelength and produces a spectrum, or at least two diffractive optical elements ( 60, 61 ) which are related to respective wavelengths and which produce at least two mutually partly overlapping spectra to give a composite spectrum. Means are provided on or in connection with the optical element in order to produce in said spectrum at least one indication of upper and/or lower wavelength value.
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