We have found a use for an small size microscopic fluorescence imaging spectroscopy to the identification of petroleum species.This instrumentation consists of microscope

variable interference filter

micro-motion stage

CCD camera

picture acquisition card and computer.The interference filter scans across every pixel of CCD array.The different column pixel in the picture which we get at every step is monocolour partial image under different wavelength

with the step by step

these column monocolour pixels change the wavelength.And finally we cut off and reassembled these images and get the whole monocolour images with different wavelength.The interval of sweep step length decided by the required spectral resolution and the required wavelength interval of different pictures.The limiting spectral resolution was controlled by bandwidth of the variable interference filter.The spatial resolution of the instrument decided ultimately by the CCD

filter and imaging objective.This microscopic imaging fluorescence spectrometer has some excellent characters such as compact structure

higher spatial resolution and spectral resolution

higher scan rate and so on.The microscopic morphologies of some oil core sections were observed.According to three dimension fluorescence spectra features data of some crude oil

we have selected proper excitation wavelengths and emission wave-lengths to distinguish different fluorescence from inorganic mineral and organic hydrocarbons.The high spatial contrast distribution picture of crude oil was obtained.