Signal processing linear filters

It is observed that the relationship between signal and concentration is linear over a finite range of concentrations. At higher concentrations, various phenomena (scattering, nonlinear optical processes, inner filter effect, etc.) lead to deviations from linearity. The range of concentrations where a linear relationship between signal and concentration holds is known as the linear dynamic range of the detector. 

The fluorimeter is set to 340 nm excitation and 420 nm emission wavelengths for monochromator instruments. For filter instruments the corresponding filters are used. In this case the excitation filter should be a narrow band pass filter ( 10 nm), while on the emission side a cut-off filter (>420nm) may be used. The fluorimeter output is fed to a linear mV recorder, a data logger, or any other signal processing system. The peak heights are proportional... 

From a signal processing point of view, the resonator acts as a filter (or bank of filters) applied to a non-linear (i.e. noisy) excitation signal. Emulation of various sound spectra is achieved by combining the production of suitable source signals with the specification of appropriate coefficients for the filters. 

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