Measurement of the Instrument Function of a Spectrometer
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چکیده
Instrument function is a measure of the intensity distribution in the output plane of a spectroscopic system assuming the input to be an ideal sharp isolated spectral line [1]. It is very essential to know, apart from the resolution limit of the spectrometer also the complete instrument function for the measurement of the exact line profile of spectral sources. The resolution properties of a spectral device can be completely determined considering a perfect monochromatic line representation. The instrument function of a spectrometer is defined by its response a(v-v') to a perfectly monochromatic spectral line represented by the Dirac function 5(v-v'). For an apparatus illuminated by a spectral line of spectral energy distribution S(v) (the source function), the spectral energy distribution recorded, s(v) is a convolution of the source function by the instrument function i.e.,
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