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| Number | Title | Issue Date |
| 8189196 | Self referencing LED detection system for spectroscopy applications A light emitting diode (LED) based detection system is employed for spectroscopy based applications. LEDs are used as monochromatic light sources for applications at specific and pre-defined wavelengths. Spectrographic information is generated using LEDs of differen... | 05/29/2012 |
| 7880882 | Multi-wavelength light source for spectroscopy The invention discloses a system for optical spectroscopy comprising a multi-wavelength semiconductor light source comprising a plurality of semiconductor light sources disposed on a silicon sub-carrier and emitting a plurality of radiation components spanning a wav... | 02/01/2011 |
| 7847942 | Peripheral interface device for color recognition A peripheral interface device for determining the color of a surface, where the surface color may then be used to determine device position and identify objects. Embodiments provide a device capable of directing different colors of light (e.g., red, green and blue) ... | 12/07/2010 |
| 7443506 | Compact spectral readers for precise color determination Systems and methods for providing spectral measurements are described. In one embodiment, a spectral measuring device comprises at least one radiation source configured to provide N (N≧2) linearly independent illuxninant sources characterized by M (M≧N) waveleng... | 10/28/2008 |
| 7411177 | Multi-spectrum image capturing device and multi-spectrum illuminating device A multi-spectrum image capturing device includes a multi-spectrum illuminating device comprising LED's for emitting lights of different wavelengths from one another, a plurality of optical rods for relaying the lights emitted from the LED's, an optical diffusion ele... | 08/12/2008 |
| 7388665 | Multicolour chromaticity sensor The present invention provides an optical sensor having one or more filter-photodetector pairs and feedback to monitor the intensity and chromaticity of the white light generated by an illumination system. According to the present invention, filter-photodetectors ar... | 06/17/2008 |
| 7365850 | Two-dimensional spectroradiometer A two-dimensional spectroradiometer has an optical system such as an objective optical system 2 and a relay lens 6 for receiving light rays La from a two-dimensional light source L to form an optical image i.e. a first image 2a and a seco... | 04/29/2008 |
| 7312874 | Apparatus and a method for determining the color stimulus specification of translucent objects The Apparatus for determining the color stimulus specification of a translucent object, for example of a tooth, comprises an illumination device as well as an image capture device. For illuminating the object under test with light in different wave length portions, ... | 12/25/2007 |
| 7295340 | Systems and methods for obtaining a spatial color profile, and calibrating a marking system Tone reproduction curves for calibrating a marking system are obtained using a test pattern with a plurality of patches, preferably a plurality of first test patches extending in a first direction and at least one second test patch extending in a second direction cr... | 11/13/2007 |
| 7289212 | Lithographic apparatus, device manufacturing method and device manufacturing thereby The X, Y and Rx positions of a mask stage are measured using two optical encoder-reading heads measuring displacements of respective grid gratings mounted on the mask stage. The grid gratings are preferably provided on cut-away portions of the mask table so as to be... | 10/30/2007 |
| 7230727 | System for sensing an absolute position in two dimensions using a target pattern A system for sensing an absolute position in two dimensions includes a target having a two-dimensional target pattern. A sensor captures an image of a first subset of the target pattern. A controller generates a first image vector representing summations of rows of ... | 06/12/2007 |
| 7227673 | Color measurement with distributed sensors in a color hard copy apparatus A method and apparatus for color measurement using a physically distributed multiplicity of sensors. Broad band illumination is provided to irradiate a test pattern. The sensors are used to measure color characteristics of discrete areas of a region of the pattern t... | 06/05/2007 |
| 7173702 | Sensor comprising multi-wavelength LEDs The illustrative embodiment of the present invention is a system and a method for the detection and identification of biological agents. The system incorporates elements that enable it to obtain an air sample, extract particulates from the air sample onto a stationa... | 02/06/2007 |
| 7141798 | Spectrum measuring apparatus and method A spectrum measuring apparatus that includes an extinction member for decreasing a light intensity from an EUV light source, a spectrum member for extracting light with a desired wavelength band from the decreased intensity light and a detector for detecting a light... | 11/28/2006 |
| 7091884 | Analog position encoder A position-measuring circuit is described for use with an analog position encoder of the kind comprising a code member and at least two sensors for sensing successive marks on the code member during relative movement between the code member and sensors, the sensors ... | 08/15/2006 |
| 7064833 | Double path microdrop optical biometric system A double path microdrop optical biometric system comprises a micro container, a corner cube array, a collimator, a beam splitting device, a light source selector, a detector and a signal comparator unit. It utilizes the beam to penetrate a specimen with specific col... | 06/20/2006 |
| 7034942 | Color measurement device and color measurement method A method, includes illuminating a first portion of a colored region with first light from a gas discharge tube and generating a first output using a diffuse reflection of the first light from the first portion. The method further includes illuminating a second porti... | 04/25/2006 |
| 7002687 | Quantitative scanning analyzer unit A scanning analyzer unit comprises a scanner device, a signal amplifier, an analog/digital converter, a driver device, a controller device, a computing unit, and a RS-232 interface. After chemical, biological, or chemi-enzymatic reaction, a resulting color change of... | 02/21/2006 |
| 6995831 | Lithographic apparatus with alignment subsystem, device manufacturing method, using alignment, and alignment structure A lithographic apparatus according to one embodiment of the invention includes an alignment subsystem configured to align the substrate on the substrate table relative to the patterning structure. The alignment structure comprises a non-periodic feature which may be... | 02/07/2006 |
| 6975949 | Full width array scanning spectrophotometer A full width array spectrophotometer for full width scanning color analysis of color test targets, with one or two substantially linear elongated arrays of closely spaced multiple LED illumination sources of plural different color emissions in a multiply repeated pa... | 12/13/2005 |
| 6948254 | Method for calibration of a metrology stage The present invention relates to a method for calibrating a metrology stage in at least two dimensions using an artefact plate having marks forming a pattern, comprising the steps of: placing the artefact plate on the metrology stage in at least three positions, ass... | 09/27/2005 |
| 6946650 | Sensor The relative position of two members is determined based upon a detected relative intensities of first and second colors of light. The intensity balance associated with relative occlusion of first and second color filter portions on one member by a mask on the other... | 09/20/2005 |
| 6937349 | Systems and methods for absolute positioning using repeated quasi-random pattern An absolute 2D position-sensing device is usable to measure the position of a first element with respect to a second element. A 2D absolute scale includes an integrated 2D absolute scale pattern extending over the 2D scale area along each measuring axis of the scale... | 08/30/2005 |
| 6930774 | Method and apparatus for producing unique radiation spectra Apparatus and methods are disclosed for providing a desired spectral intensity profile from a broadband light source. The apparatus comprises separation means for separating light provided by the broadband light source into radiation having a continuum of wavelength... | 08/16/2005 |
| 6781694 | Two-dimensional scale structures and method usable in an absolute position transducer An absolute 2D position-sensing device is usable to measure the relative position of two elements. A 2D absolute scale includes an integrated 2D absolute scale pattern extending over the 2D scale area along each measuring axis of the scale. The integrated 2D absolut... | 08/24/2004 |
| 6690471 | Color imager bar based spectrophotometer for color printer color control system An improved and lower cost color spectrophotometer, especially suitable for on-line color printer color control systems, incorporating a low cost commercial imaging chip, which normally only forms part of a three row, three color, document imaging bar use... | 02/10/2004 |
| 6650416 | Color image bar based spectrophotometer photodetector optical orientation A color spectrophotometer incorporating a low cost commercial imaging chip, which normally forms part of a document imaging bar used for imaging documents in scanners, etc., having multiple photo-sites with three different rows of color filters. Each chip... | 11/18/2003 |
| 6556300 | Color imager bar based spectrophotometer photodetector optical orientation A color spectrophotometer incorporating a low cost commercial imaging chip, which normally forms part of a document imaging bar used for imaging documents in scanners, etc., having multiple photo-sites with three different rows of color filters. Each chip... | 04/29/2003 |
| 6449045 | System and method from reconstruction of spectral curves using measurements for a color sensor and statistical techniques A limited number of voltage measurements are received from a multiple illuminant color sensor at the direction of a color sensor controller. The received sensor voltages are normalized in accordance with a calibration look-up table. Next, the normalized s... | 09/10/2002 |
| 5991045 | Color analyzer for use with light-emitting and non-light-emitting test objects A color analyzer is capable of determining the color property of a test object, and includes a light collector having a first end formed with a test opening and adapted to be placed in juxtaposition with the test object, a second end, and a light channel ... | 11/23/1999 |
| 5946427 | Image reading method and image reading apparatus An image reading method and apparatus enable a high-speed, efficient reading of a multicolor image and a monochromatic image. The image reading apparatus has a color image pickup unit, a first light source and a second light source. An output switching un... | 08/31/1999 |
| 5844680 | Device and process for measuring and analysing spectral radiation, in particular for measuring and analysing color characteristics A device and process for measuring and analyzing spectral radiation within a desired wavelength range. A number of radiation sources are provided, in combination with a sensor for detecting radiation within the desired wavelength range. The radiation sour... | 12/01/1998 |
| 5680220 | Device and method for optically measuring the characteristics of a substance utilizing three wavelengths of light A first embodiment of the invention includes a light source (1) lighting two parallel optical branches (b1, b2) controlled respectively by two optical shutters (4, 6), one comprising a transparent cell (3) containing a substance to be studied, and the oth... | 10/21/1997 |
| 5596402 | Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device A viewing device for use by an observer to ascertain the authenticity of an instrument of value having an image formed from an optically variable device. The viewing device includes a frame structure which permits viewing of the image in a fixed spatial o... | 01/21/1997 |
| 5537213 | Light measurement apparatus with resiliently biased sheath for defining light-tight enclosure and related method Light measurement apparatus includes an elongate member which has at one end thereof light emitter(s) and light detector(s). At least the end of the elongate member that has the light emitter(s) and light detector(s) is surrounded by a resiliently biased ... | 07/16/1996 |
| 5296702 | Structure and method for differentiating one object from another object An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very ... | 03/22/1994 |
| 5054487 | Laser systems for material analysis based on reflectance ratio detection Systems and methods for non-invasive material analysis are disclosed in which a material (e.g., a liquid such as blood) is illuminated at a plurality of discrete wavelengths. Measurements of the intensity of reflected light at such wavelengths are taken, ... | 10/08/1991 |
| 4986665 | Optical density detector An optical density detector which comprises a first light source for emitting a first light which belongs to a wavelength region in which the first light is hardly absorbed by a specific material contained in a sample, a second light source for emitting a... | 01/22/1991 |
| 4949400 | Hand held glucose colorimeter device A method and apparatus for increasing the sensitivity and accuracy of apparatus used in chemical analysis utilizing the colorimeter method. The method employs two or more light emitting diodes which emit light at different wavelengths. The emission wavele... | 08/14/1990 |
| 4838697 | Apparatus for rapid colorimetry on different samples An apparatus for rapid colorimetry on different samples which has a transmitter for irradiating or through-radiating the particular sample and a receiver for receiving the radiation reflected or transmitted by the sample, as well as a filter arrangement. ... | 06/13/1989 |
