Abstract:
A method and system for effecting an appearance model correction for a display unit, e.g., a CRT, using a polynomial-based algorithm is described. The correction may be effected in real time and is based on gamma values associated with the display. Strong correlations with the CIECAM02 specification are achieved according to the present disclosure. The correction functionality may be implemented using a colorimeter that includes a plurality of sensors/filter systems with non overlappng spectral responses, adequate for providing data capable of translation into standard coordinates system such as, CIE XYZ, CIE L* a* b*, or CIE Luv, as well as non-standard operable coordinate systems. The field of view of the colorimeter is chosen to closely track the response of the human eye using an optical path configured to select and limit the field of view in a manner that is insensitive to placement of the colorimeter on the source image. The optical path from the source image to the sensor is configured to select preferred light rays while rejecting undesirable light rays to maximize the signal/noise ratio. A rearward facing sensor channel is included to simultaneously measure ambient light impinging on the source image and feedback means to provide status and/or change of information.
Abstract:
An auto-tracking spectrophotometer has a moveable look-ahead sensor for scanning at least a portion of a color matrix. The look-ahead sensor finds a portion of the color matrix for measurement by an optical system. The optical system for measuring the color matrix is then guided using the information provided by the look-ahead sensor.
Abstract:
An apparatus for holding a generally flat color sample in a plurality of fixed and repeatable positions in proximity with the optics of a portable color instrument with a uniform and repeatable force. The apparatus has a platform upon which the portable color instrument is secured, a sample stage with multiple index planes upon which a color sample is placed, and a device which urges a pressure foot against the color sample, thereby holding the color sample in position on the stage with a uniform and repeatable force.
Abstract:
A zoom lens (40) is provided between a sample (2) and a slit (12) of a spectrophotometer to change the size of the image of the sample on the slit plane. A picture of the sample is taken by the zoom lens (40) and is shown on a display screen (33), on which a window is superimposed. When an operator changes the location of the window, the sample (2) is moved accordingly and, when the operator changes the size of the window, the focal length of the zoom lens (40) is changed, whereby the size of the measurement area is changed. By changing the size of the measurement area on the slit plane while the size of elementary photo-sensors of a photo-detector (17) is unchanged, the resolution of two-dimensional spectrophotometry can be changed.
Abstract:
Améliorations structurelles d'appareils photométriques (colorimètre, spectrophotomètre) utilisés pour mesurer des paramètres déterminant la couleur (luminance de réflexion, composantes trichromatiques, etc...). L'on propose une nouvelle géométrie optique, qui pourrait être définie comme sphérique-diffuse (illumination)/sphérique-diffuse (observation). Il en existe deux modes fondamentaux de réalisation, le premier en association avec un appareil photométrique déjà existant, la nouvelle géométrie optique étant couplée à l'extérieur dudit appareil, et le deuxième consistant à intégrer la nouvelle géométrie optique dans l'appareil de mesure. Dans les deux cas, les structures qui présentent la nouvelle géométrie optique sont également utilisées comme porte-échantillons.
Abstract:
There is disclosed a sample holder comprising: a base member; a holder member (21) attached to the base member, the holder member having at least one flexible tab (22) resiliently biased towards the base member; wherein one of the base member and the tab comprises a first formation (28) provided on a face thereof so that a sample having a corresponding second formation (38) can be located between the tab and the base member and retained by cooperation of the first and second formations.
Abstract:
In some aspects, a device for apportioning granular samples includes a sample feeder defining a conduit, the conduit including a first opening to receive the granular samples and a second opening. The device includes a shuttle operably coupled to the sample feeder to receive the granular samples from the conduit via the second opening. The shuttle is configured to apportion the granular samples to incrementally enter a sample chamber to be analyzed. The device includes an outlet conduit fluidly coupled to the sample chamber and configured to permit the sample chamber to be evacuated.
Abstract:
A spectroscopic measurement apparatus 1A comprises an integrating sphere 20 in which a sample S is located, a spectroscopic analyzer 30 dispersing the light to be measured from the sample S and obtaining a wavelength spectrum, and a data analyzer 50. The analyzer 50 includes an object range setting section which sets a first object range corresponding to excitation light and a second object range corresponding to light emission from the sample S in a wavelength spectrum, and a sample information analyzing section which determines a luminescence quantum yield of the sample S, determines a measurement value ¦ 0 of the luminescence quantum yield from results of a reference measurement and a sample measurement, and determines, by using factors ², ³ regarding stray light in the reference measurement, an analysis value ¦ of the luminescence quantum yield with the effect of stray light reduced by ¦ = ²¦ 0 +³. This realizes a spectroscopic measurement apparatus, a measurement method, and a measurement program which can reduce the effect of stray light generated in a spectrometer.
Abstract:
The invention relates to a cuvette comprising at least one insert having two measuring surfaces. Said insert is a test prod that has both measuring surfaces on one end that is at a distance from the other end of the test prod, and comprises an adapter for inserting into the cuvette shaft of an optical measuring device and insert and adapter means for detachably maintaining the at least one insert in the adapter, the measuring surfaces being at a distance from each other in order to position a sample between the measuring surfaces in a beam path of the optical measuring device, said beam path passing through the cuvette shaft.