Abstract: A color measuring sensor assembly includes an optical filter such as a linear variable filter, an optical detector array positioned directly opposite from the optical filter a predetermined distance, and a coherent fiber faceplate having a plurality of optical fibers interposed between the optical filter and the detector array. A light beam propagating through the fiber faceplate from the optical filter to the detector array projects an upright, noninverted image of the optical filter onto a photosensitive surface of the detector array. Each optical fiber in the fiber faceplate is of limited aperture to control the tendency of light to diverge and to increase the resolution capabilities of the sensor assembly. The color measuring sensor assembly can be incorporated with other components into a spectrometer device such as a portable calorimeter having a compact and rugged construction.

Abstract: An optical fiber coupling assembly includes an optical fiber receiver, an optical spacer, and an optical filter such as a linear variable filter. The optical spacer can comprise either a monolithic block of optically transparent material, or an optical cavity within reflective walls. The fiber receiver can comprise either a machined attachment on an opaque lightweight block or can be a surface on the optical spacer configured to receive and adhesively bond an optical fiber. The optical spacer recirculates light that is incident on an optical filter segment that is not within the segment's designated wavelength range, thereby permitting multiple passes of the light within the assembly. A color measuring sensor device using the fiber coupling assembly can be incorporated with other components into a spectrometer device such as a portable calorimeter having a compact and rugged construction suitable for use in the field.

Abstract: A color measuring sensor assembly includes an optical filter such as a linear variable filter, an optical detector array positioned directly opposite from the optical filter a predetermined distance, and a coherent fiber faceplate having a plurality of optical fibers interposed between the optical filter and the detector array. A light beam propagating through the fiber faceplate from the optical filter to the detector array projects an upright, noninverted image of the optical filter onto a photosensitive surface of the detector array. Each optical fiber in the fiber faceplate is of limited aperture to control the tendency of light to diverge and to increase the resolution capabilities of the sensor assembly. The color measuring sensor assembly can be incorporated with other components into a spectrometer device such as a portable calorimeter having a compact and rugged construction.