Abstract:
L'invention concerne un procédé de limitation de la diaphonie dans un capteur d'imagerie, ce capteur se présentant comme une matrice de macropixels définissant une image, chaque macropixel étant formé par une matrice de pixels élémentaires chacun dédié à une bande spectrale distincte, l'ensemble des pixels élémentaires dédiés à une même bande spectrale formant une sous- image, cette image étant décomposée topologiquement en au moins une parcelle, procédé comprenant les étapes suivantes : - mesure 700 de la réponse spectrale de chaque pixel élémentaire λ1, λ.2, λ3,..., λ9, - calcul 701 dans une parcelle de la réponse spectrale moyenne de chaque sous-image, - ciblage 702 pour définir dans cette parcelle la réponse idéale de chaque sous-image, - estimation 703 d'une série de coefficients pour minimiser la diaphonie dans cette parcelle, - application 704 de ces coefficients sur les macropixels pour corriger dans la parcelle les sous-images. Le procédé est remarquable en ce que la réponse idéale est une fonction gaussienne.
Abstract:
An optical filter, a sensor device including the optical filter, and a method of fabricating the optical filter are provided. The optical filter includes one or more dielectric layers and one or more metal layers stacked in alternation. The metal layers are intrinsically protected by the dielectric layers. In particular, the metal layers have tapered edges that are protectively covered by one or more of the dielectric layers.
Abstract:
A detector (110) for an optical detection of at least one object (112)is proposed. The detector (110) comprises: - at least one transfer device (120), wherein the transfer device (120) comprises at least two different focal lengths (140) in response to at least one incident light beam (136); - at least two longitudinal optical sensors (132), wherein each longitudinal optical sensor (132) has at least one sensor region (146), wherein each longitudinal optical sensor (132) is designed to generate at least one longitudinal sensor signal in a manner dependent on an illumination of the sensor region (146) by the light beam (136), wherein the longitudinal sensor signal, given the same total power of the illumination, is dependent on a beam cross-section of the light beam (136) in the sensor region (146), wherein each longitudinal optical sensor (132) exhibits a spectral sensitivity in response to the light beam (136)in a manner that two different longitudinal optical sensors (132) differ with regard to their spectral sensitivity;wherein each optical longitudinal sensor (132) is located at a focal point(138) of the transfer device (120) related to the spectral sensitivity of the respective longitudinal optical sensor (132); and - at least one evaluation device (150), wherein the evaluation device (150) is designed to generate at least one item of information on a longitudinal position and/or at least one item of information on a color of the object (112) by evaluating the longitudinal sensor signal of each longitudinal optical sensor (132). Thereby, a simple and, still, efficient detector for an accurate determining of a position and/or a color of at least one object in space is provided.
Abstract:
An embodiment of a method for processing light sensor signals comprises illuminating a clear sensor (CS) and a color sensor (RS, GS, BS) of a light sensor system with a test light having a test spectrum. Therein the color sensor (RS, GS, BS) comprises an optical filter and is designed to sense light with a wavelength within a pass band of the filter and the test spectrum has components outside of the pass band. A clear test signal which is generated by the clear sensor (CS) and a color test signal which is generated by the color sensor (RS, GS, BS) are received. Then a first transmission value (T) is determined based on the clear test signal and on the color test signal. Finally, a compensation factor (Kr, Kg, Kb) is calculated based on the first transmission value (T) and on a nominal transmission value (Tn) of the filter.
Abstract:
An adapter (10) for use with a hand-held electronic device (12) for use in detecting the optical properties of a sample. The adapter includes a backing plate (14) having an integral surface (22) that secures the adapter (10) to the electronic device (12). The adapter (10) also includes a sample housing (36) having a sample holder (38) and a cap (40). The sample holder (38) is configured to receive the placement of a sample and/or a sample vessel (44). The backing plate (14) includes an orifice (20) that allows the passage of light from the sample to the detector (32) of the electronic device (12). The backing plate (14) may also include another orifice (21) that allows for light emitted from an emitter (34) of the electronic device (12) to enter into the sample holder (38). The sample holder (38) may also include reflective surfaces that direct light to/from the sample as well as filters (60, 62) that filter the wavelength of light sent to sample and/or detected by the detector (32).
Abstract:
An optical imaging system and method including a movable pixelated filter array, a shutter mechanism to which the pixelated filter array is attached, and a controller configured to implement a data reduction algorithm. The shutter mechanism is configured to move the pixelated filter array into and out of the optical path, and the data reduction algorithm allows the controller to account for axial and/or lateral misalignment of the filter array relative to the imaging detector array or its conjugate. In certain examples, the controller is further configured to use the data reduction algorithms also to perform wavefront sensing, for example to estimate wavefront error.
Abstract:
A smartphone is adapted for use as an imaging spectrometer, by synchronized pulsing of different LED light sources as different image frames are captured by the phone's CMOS image sensor. A particular implementation employs the CIE color matching functions, and/or their orthogonally transformed functions, to enable direct chromaticity capture. A great variety of other features and arrangements are also detailed.