FIELD: instrumentation engineering. SUBSTANCE: invention is related to spectral instrumentation. Salient feature of given spectrum analyzer lies in that circular wedge light filter is placed after radiation source and radiation detector comes in the form of device with two inputs through which optical system of detecting lens directs radiation spectra passed through dishes with reference and tested substances modulated by various frequencies of frequency raster simultaneously on to sensitive element of detector. EFFECT: enhanced measurement accuracy. 3 dwg
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