Abstract: In a spectrophotometer, light that has passed through, or been reflected from, a sample is carried by a fiberoptic bundle. The output end of the fiberoptic bundle is bonded to one side of a wedge-shaped linear variable interference filter. The other side of the filter is bonded to an array of photodiodes. Because each photodiode receives light that has passed through a different portion of the filter, each photodiode will respond to light of a different wavelength.

Abstract: A spectrophotometer includes a wide band radiant energy source and a detector for providing an output signal proportional to the intensity of the radiant energy received thereby. A light pipe system is divided into a reference path and a sample path. Such system coacts with a rotary assembly having a variable monochromatic filter located diametrically opposite to an opening through which radiant energy can freely pass. The remaining portions of the rotary assembly are opaque so that as the assembly turns, the sample and reference paths are serially energized by monochromatic energy and then by polychromatic energy. The sample path includes a sample illumination and collection system for illuminating a test sample and collecting the light reflected therefrom. The resultant output of the detector can be analyzed to determine the amount of fluorescence.