World Precision Instruments, Inc.

Diping Che

Harry Fein

Su-Yi Liu

A chromatically variable light source includes a plurality of light emitting diodes which generate substantially monochromatic light at different wavelengths. The light source includes circuitry for selectively energizing one or more of the light emitting diodes and for controlling the intensity of the generated light. The light generated by the light emitting diodes is combined in a single light pipe and delivered to an output port for use.

Filterless chromatically variable light source

The chemical properties of an aqueous liquid, the liquid comprising a solvent having an index of refraction which is the same as or closely approaches that of water, are determined by Raman spectroscopy wherein a sample of the liquid is delivered into an optical waveguide. The waveguide is in the form of a capillary having a reflective surface defined by a material having a refractive index of less than 1.33. Excitation light is transmitted axially into the liquid at an end of the waveguide. The excitation light is transmitted the length of the waveguide, by reflection from the reflective surface, causing the fluid to emit Raman spectra. The Raman spectra is transmitted along the waveguide, collected and delivered to a spectrometer.

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Sarasota, FL, United States of America

Diping Che