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Transcript
monochromator: resolves the spectrum using a (reflecting) grating or a prism, transparent in the investigated region (or a Fourier transform spectrometer is used). detector: transforms the optical signal to electric one. - photocell, photodiode, photodiode array, photomultiplier (PMT: photomultiplier tube), photoelement in the UV and VIS regions, CCD (coupled charge detector); - thermoelement in the VIS and IR regions; - piezoelectric crystal, Golay cell (IR, far IR); - chilled semiconductor detectors (IR, near IR). electronics: signal elaboration (signal difference for doublebeam spectrometers, amplitude or phase modulation, amplification), digital computer, printer and plotter.
