Spectrophotometer with light source in the form of a light...

Details Spectrophotometer with light source in the form of a light... Spectrophotometer with light source in the form of a light...

G - Physics

01

J

G01J 3/10 (2006.01) G01J 3/02 (2006.01) G01J 3/28 (2006.01)

Patent

CA 2160099

In a spectrophotometer, a light source is provid- ed in the form of a multiplicity of light emitting diodes which transmit light through an entrance slit to irradiate an oscillating grating. The light is dispersed by the grating toward an exit slit which transmits a narrow bandwidth of light to irradiate a sample. As the grating oscillates, the wavelength transmitted through the exit slit is scanned through a selected spectrum. The diodes in the array each emit light in a different wavelength band so that the diodes as a group emit light throughout the selected spectrum. As the grating oscillates, the diodes are energized and extinguished in sequence so that no more than two diodes will be energized at any given instant of time and the energized diode will be emitting light at the wavelength dispersed by the grating to the exit slit.

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