Abstract:
Demultiplexing systems and methods are discussed which may be small and accurate without moving parts. In some cases, demultiplexing embodiments may include optical filter cavities that include filter baffles and support baffles which may be configured to minimize stray light signal detection and crosstalk. Some of the demultiplexing assembly embodiments may also be configured to efficiently detect U.V. light signals and at least partially compensate for variations in detector responsivity as a function of light signal wavelength.
Abstract:
A spectral characteristic obtaining apparatus including a light irradiation unit configured to emit light onto a reading object; a spectroscopic unit configured to separate at least a part of diffused reflected light from the light emitted onto the reading object by the light irradiation unit into a spectrum; and a light receiving unit configured to receive the diffused reflected light separated into the spectrum by the spectroscopic unit and to obtain a spectral characteristic. The light receiving unit is configured to be a spectroscopic sensor array including plural spectroscopic sensors arranged in a direction, and the spectroscopic sensors include a predetermined number of pixels arranged in the direction to receive lights with different spectral characteristics from each other.
Abstract:
One embodiment of a solid-state color-measuring device includes a plurality of photodetectors and a plurality of filters permanently deposited on the photodetectors, where at least one of the filters includes a single colorant layer having a transmission coefficient as a function of wavelength that descends from a maximum value between approximately 445 and 450nm to fifteen percent of the maximum value between approximately 485 and 495nm.
Abstract:
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum messtechnischen Erfassen der Farbe eines Objekts (12), bei denen mit Hilfe einer Beleuchtungsanordnung (14), die mindestens zwei Lichtquellen (16 bis 38) mit unterschiedlichen spektralen Lichtverteilungen aufweist, von den Lichtquellen (16 bis 38) gleichzeitig Lichtstrahlen auf das Objekt (12) abgestrahlt werden. Mit Hilfe eines Sensors (40) wird zumindest ein Teil der vom Objekt (12) reflektierten Lichtstrahlen entsprechend mindestens einer spektrale Empfindlichkeitsfunktion erfasst. Die spektrale Empfindlichkeitsfunktion bewirkt eine spektrale Filterung der vom Sensor (40) erfassten Lichtstrahlen.
Abstract:
Computed tomography imaging spectrometers ("CTIS"s) having color focal plane array detectors are provided. The color FPA detector may comprise a digital color camera including a digital image sensor, such as a Foveon X3® digital image sensor or a Bayer color filter mosaic. In another embodiment, the CTIS includes a pattern imposed either directly on the object scene being imaged or at the field stop aperture. The use of a color FPA detector and the pattern improves the accuracy of the captured spatial and spectral information. OSB/rjf
Abstract:
An apparatus for imaging an object comprises a plurality of shutter elements (601, 606, 614) and a sensor (603, 608, 612), each shutter element (601, 606, 614) being operable to control (602, 609, 613) passage of light from a separate spatial location on the object to be imaged, wherein the incident light from the shutters (601, 606, 614) simultaneously illuminates a common area on a sensor (603, 608, 612) surface and wherein the incident light from the different shutters(601, 606, 614) is still individually discernible due to shutter control (602, 609, 613).
Abstract:
A tristimulus colorimeter for measuring reflective or transmissive materials is provided. The colorimeter measures a sample under a calibrated light source, receives inputs to detectors, and determines CIE tristimulus values of the same sample as they would occur under a reference light source. The colorimeter includes a calibrated light source and a single silicon chip that includes three or more detectors. Each detector is permanently coated by a different mix of dyes or other colorants that form a wavelength-selective filter. A single silicon chip embodies all the detectors and electronics, with each detector coated over by deposited filter layers.
Abstract:
Computed tomography imaging spectrometers ("CTIS"s) having color focal plane array detectors are provided. The color FPA detector may comprise a digital color camera including a digital image sensor, such as a Foveon X3® digital image sensor or a Bayer color filter mosaic. In another embodiment, the CTIS includes a pattern imposed either directly on the object scene being imaged or at the field stop aperture. The use of a color FPA detector and the pattern improves the accuracy of the captured spatial and spectral information. OSB/rjf
Abstract:
A scanning device for the photoelectric measurement pixel by pixel of a measurement object in the form of a printed sheet comprises a measurement table (MT) for supporting the measurement object, a measurement system movable over the surface of the measurement table for scanning pixel lines of the measurement object, a driving system for moving the measurement system over the measurement object, a measurement and driving control system for the measurement system and the driving system, and a processing system for processing and evaluating the measurement signals generated by the measurement system from the scanned pixels of the measurement object (S). The measurement system comprises a lighting system, a photoelectric reception system and optical means. The lighting system exposes pixels located in strip-shaped lighting regions (15) to light at a standardised range of angles of incidence. The photoelectric reception system comprises a plurality of parallel, mutually spaced apart photoelectric line sensors (21) sensitised to different wavelength ranges by upstream chromatic filters (22). The optical means comprise linear optic arrangements (31) which capture the measurement light reflected by the pixels at a standardised range of angles of incidence and direct the measurement light to each one of the line sensors (21). Crosstalk effects between adjacent pixels are substantially reduced by optical screening and other structural measures. The scanning device makes it possible to scan entire printed sheets at high speed and has a comparatively simple structure. It combines the advantages of the known technology of image-capture appliances but does not have its inherent drawbacks. It is there suited for quality control applications in the graphic industry and for the colorimetric control of printing processes.