Measuring surface distribution of narrowband radiation wavelength by colorimetric method

We propose a method to measure the narrowband radiation wavelength when having a digital picture of the emitting surface. The accuracy of the wavelength determination is better then 1 nm. The method was tested with pictures of the Hg spectrum and with the continuous spectrum of the filament lamp. The degree of homogeneity of the holographic sensor swelling was studied by the method in the stationary case as well as in the non-stationary one.