Abstract:
Multiport multispectral portable imaging systems having at least two cameras with charge-coupled device sensors, a front lens unit, at least two rear lens units, a beamsplitter, and at least two bandpass filters is used to detect contaminants on food.
Abstract:
Systems and techniques for imaging spectroscopy using improved data acquisition for infrared and near-infrared imaging. A first filter corresponding to a first wavelength may be positioned in the optical path of an infrared camera, and subframe data may be acquired for different exposures. A second filter corresponding to a second different wavelength may be positioned in the optical path of the infrared camera, and subframe data acquired for different exposures. Image data for the first wavelength and the second wavelength may then be compared to reference spectroscopic data.
Abstract:
In a spectroscopy module 1, a light passing hole 50 through which a light L1 advancing to a spectroscopic portion 4 passes is formed in a light detecting element 5. Therefore, it is possible to prevent the relative positional relationship between the light passing hole 50 and a light detecting portion 5a of the light detecting element 5 from deviating. Moreover, the light detecting element 5 is bonded to a front plane 2a of a substrate 2 with an optical resin adhesive 63. Thus, it is possible to reduce a stress generated onto the light detecting element 5 due to a thermal expansion difference between the light detecting element 5 and the substrate 2. Additionally, on the light detecting element 5, a first convex portion 101 is formed so as to be located at least between the light detecting portion 5a and the light passing hole 50 when viewed from a direction substantially perpendicular to the front plane 2a. Thus, when the light detecting element 5 is attached to the substrate 2 via the optical resin adhesive 63, the optical resin adhesive 63 is dammed at the first convex portion 101. Thus, the optical resin adhesive 63 is prevented from penetrating into the light passing hole 50.
Abstract:
A Micro-Electro-Mechanical System (MEMS) based Fabry-Perot array may be used as a spectral filter to light sensing array, such as a CCD or CMOS photodetector. Applying different voltages to the electrodes of individual Fabry-Perot cells within the array allows a gradient in the Fabry-Perot air gap across the Fabry-Perot array. In this manner the MEMS Fabry-Perot array serves as a spectral filter of light passing through the Fabry-Perot array to the photodetector array. Embodiments of the disclosed sensor, used with LEDs that emit light outside the photosensitivity range of a photoreceptor belt, may be used to measure spectral information from toned patches placed upon a photoreceptor belt within a marking system. Other embodiments of the disclosed sensor, used with LEDs that emit light of any wavelength, may be used to measure spectral information from toned patches placed by a marking system upon a non-photosensitive output substrate, such as an intermediate belt or paper.
Abstract:
The present invention relates to a method and system of array imaging that extends or maximizes the longevity of the sensor array by minimizing the effects of photobleaching. The imaging system has a light source, a variable exposure aperture, and a variable filter system. The system extends the longevity of sensors by (1) using the variable exposure aperture to selectively expose sections of the sensor array containing representative numbers of each type of sensor, and/or (2) using the variable filter system to control the intensity of the excitation light, providing only the intensity required to induce the appropriate excitation and increasing that intensity over time as necessary to counteract the effects of photobleaching.
Abstract:
The invention relates to a spectrograph (11) comprising a waveguide (10) provided with accesses (10; 10b, 12), a means for injecting two guided contra-propagative waves by each accesses in such a way that a spatial interference is formed in the waveguide, means (19, 20, 14, 16) for detecting the energy of the evanescent wave of the guided field produced by the interference of said contra-propagative waves.
Abstract:
Image sensors and methods of operating image sensors. An image sensor includes an array of pixels and an array of color filters disposed over the array of pixels such that each different color filter is disposed over multiple pixels. A method of operating an image sensor including an array of two by two blocks of single color pixels includes determining a level of incident light, determining an incident light value corresponding to the level of incident light and comparing the incident light value to a predetermined threshold value. If the incident light value is less than the predetermined threshold value, a combined signal is read from the two by two blocks. If the incident light value is less than the predetermined threshold value, an individual signal is read from each pixel.
Abstract:
The present solution is directed to a measuring system and a method for determining spectrometric measurement results with high accuracy. The spectrometric measuring system, comprises a radiation source, an entrance slit, a dispersion element, and a detector with detector elements arranged in a linear or matrix-shaped manner in one or more planes. The detector has an even distribution of at least two different wavelength-selective filters on its detector elements. While detectors from photography and video applications are used for this purpose, use of the invention is not limited to the visible spectral region. Further, color filters on the pixels may be omitted or modified in the manufacturing process. It is also possible to use other types of detectors in which the wavelength-selective filters and associated detectors are arranged one behind each other in a plurality of planes in which complete color information is available to each individual picture point.
Abstract:
The apparatus and methods herein provide quantitatively controllable light sources and expanded dynamic range endoscopy systems that can improve the quality of images and the ability of users to distinguish desired features when viewing tissues by providing methods and apparatus that improve the dynamic range of images from endoscopes, in particular for example with endoscopes that have dynamic range limited because of small image sensors and small pixel electron well capacity, and other optical system constraints. The apparatus and methods herein, for example, combine light sources with quantitatively variable spectral output and quantitatively variable wavelength dependent intensity distribution with image sensors and controllers to create an expanded dynamic range endoscopy system. By digitally combining illumination data from the digitally controllable light source with the digital image data from the image sensor the system synthesizes expanded dynamic range images whose dynamic range exceeds the dynamic range of the image sensor alone thus providing greatly enhanced information content in the acquired images.