Abstract:
Die Erfindung betrifft ein Verfahren zur Ermittlung zumindest einer Prüfeigenschaft eines Prüfgegenstands und eine Messvorrichtung, welche geeignet ist, ein Messfeld (3) unter einer Vielzahl an Anstrahlungskombinationen aus Einstrahlungswinkel (α) und/oder Wellenlängenbereich (A) mit elektromagnetischer Strahlung (5) anzustrahlen und die Intensität der jeweils von dem Messfeld unter zumindest einem Abstrahlungswinkel (β) remittierten elektromagnetischen Strahlung (5) zu messen. Die Prüfeigenschaft weist zumindest ein definiertes messbares Einzelmerkmal auf, wobei das Einzelmerkmal oder eine definierte Merkmalskombination mehrerer solcher Einzelmerkmale die Herkunft und/oder Identität des Prüfgegenstandes (1) belegt, wobei das Einzelmerkmal oder die Merkmalskombination messbar ist, wenn sie durch die elektromagnetische Strahlung (5) auf eine durch eine Auswahl an Anstrahlungkombinationen definierte Art und Weise optisch angeregt wird. Das Einzelmerkmal oder die Merkmalskombination wird mit der Messvorrichtung (4) in dieser Art und Weise angeregt und gemessen.
Abstract:
A lighting device (100) is suitable for adjusting a light colour with respect to elements contained within an output field, separately for each element. The lighting device comprises at least two light systems (1a-1d) each adapted for operating as a light detector and also as a light source, a scanning system (2) suitable for scanning the output field, and a processing unit (3). Such lighting device is especially adapted for exhibiting articles with producing enhanced appeal to an observer. To this purpose, light which is directed towards each element may be enhanced in saturation and brightness as compared to initial light reflected by the element, while hue may be substantially maintained.
Abstract:
A contactless dental device 2 for determining tooth colors includes illuminating means for illuminating with ambient illumination light a tooth 6 to be examined. At least one color sensor 8 for acquisition and spectral examination of light reflected by the tooth 6 is inventively provided, wherein filtering means 16 are associated with the color sensor for at least partial separation of a signal component originating from the illumination light from the signal component originating from the ambient light. Evaluating means 18 for determining the tooth color based on the signal component originating from the illumination light are disposed downstream of the filtering means 16.
Abstract:
The present invention relates to a light source for a spectrophotometer which is to be directed upon a reflective sample for measuring the spectral reflectance of a sample surface, the light source comprising: (a) a plurality of electrofluorescent illuminants each having a different emission spectra; and (b) each illuminant individually adjustably energized by a pulse width modulated signal.
Abstract:
An optical characteristic measuring apparatus and an optical characteristic measuring method of the invention are an optical characteristic measuring apparatus and method for obtaining a predetermined optical characteristic such as a color value or a total spectral radiation factor of a measurement object. A spectral intensity distribution of predetermined ambient light entering through a measurement opening is measured and stored prior to measurement of the optical characteristic. In measuring the optical characteristic, an optical characteristic in a condition that actually measured ambient light is used as an observation light source is obtained, with use of the stored spectral intensity distribution of ambient light.
Abstract:
The optical assemblies disclosed herein advantageously utilize a beamsplitting apparatus in association with either (i) the illumination path or (ii) the collection path of a color measurement instrument. For implementations involving the illumination path, the beamsplitting apparatus may be configured to spectrally divide one or more initial beams of light so as to emit a plurality of resultant beams of light, wherein the optical assembly is configured to illuminate a target using at least a first and a second of the plurality of resultant beams of light. Similarly, for implementation involving the collection path, the beamsplitting apparatus may be configured to spectrally divide light received from a target so as to emit a plurality of resultant beams of light, wherein the optical assembly is configured to detect at least a first and a second of the plurality of resultant beams of light. Advantageously, each of the first and second resultant beams of light is a product of a distinct set of one or more spectral constraints exacted by the beamsplitting apparatus.