Comtuter screen photo-assisted techiniques for chemical sensing

the paper deals with the use of the computer screen as a light source in colorimetric experiments (light absorption, reflection, scattering, emission) with a web camera as a detector. this combination will be described in some detail and some examples of its applications given, related mainly to biomedical analysis. it is e.g. shown how the computer/web camera platform can be used to read arrays of biomedical samples and to perform colorimetric diagnostic tests. it is furthermore shown that the set-up can give fingerprints of coloured substances through a simultaneous measurement of both absorption and emission of light. the use of the computer screen photo- assisted technique as an electronic nose is also described. finally further developments and possibilities for the computer screen photo-assisted techniques are speculated upon.