Abstract:
Using an optical computing device includes optically interacting electromagnetic radiation with a sample and a first integrated computational element arranged within a primary channel, optically interacting the electromagnetic radiation with the sample and a second integrated computational element arranged within a reference channel, producing first and second modified electromagnetic radiations from the first and second integrated computational elements, respectively, receiving the first modified electromagnetic radiation with a first detector, and receiving the second modified electromagnetic radiation with a second detector, generating a first output signal with the first detector and a second output signal with the second detector, and computationally combining the first and second output signals with a signal processor to determine the characteristic of interest of the sample.
Abstract:
An optical module (colorimetry sensor) includes an interference filter, and a transparent substrate to which a first substrate of the interference filter is fixed, having a second thermal expansion coefficient which has a value different from a first thermal expansion coefficient. The interference filter is fixed to the transparent substrate through an adhesive layer made of gel-like resin, and the adhesive layer alleviates stress generated due to a difference in the thermal expansion coefficients between the interference filter and the transparent substrate.
Abstract:
Optical computing devices are disclosed. One exemplary optical computing device includes an electromagnetic radiation source configured to optically interact with a sample and first and second integrated computational elements arranged in primary and reference channels, respectively. The first and second integrated computational elements produce first and second modified electromagnetic radiations, and a detector is arranged to receive the first and second modified electromagnetic radiations and generate an output signal corresponding to the characteristic of the sample.
Abstract:
A filter wheel and a spectrometer including the filter wheel are disclosed. The filter wheel has a first support structure on which a first plurality of filters are mounted and a second support structure on which at least one filter is provided. A radiation source generates a radiation beam, and a beam splitter splits the radiation beam into a first detection path and a second detection path. The first plurality of filters are selectively movable into the first detection path. The at least one filter on the second support structure is arranged to be disposed in the second detection path. The spectrometer includes a first radiation detector that detects radiation that passes through the selected filter in the first detection path, and a second radiation detector that detects radiation passing through the filter in the second detection path.
Abstract:
A radiation thermometer is provided, comprising: a thermal radiation detector assembly having an operative surface area responsive to thermal radiation of a first wavelength; a focussing optics assembly adapted to focus both thermal radiation of the first wavelength and visible light of a second wavelength along an optical axis, the focussing optics assembly being configured to form a focussed image of the operative surface area of the thermal radiation detector assembly on a focal plane outside the radiation thermometer, the focussed image of the operative surface area defining a target region from which the thermal radiation detector assembly detects thermal radiation; a visible light source assembly adapted to exhibit an illuminated pattern of visible light of the second wavelength, the visible light source assembly comprising at least one visible light source and a mask through which light from the at least one visible light source is arranged to pass, the mask having one or more substantially opaque portions and one or more translucent portions arranged to define the illuminated pattern; and a radiation splitter adapted to deflect one of thermal radiation of the first wavelength and visible light of the second wavelength, and to transmit the other, or to deflect both wavelengths differently, the radiation splitter being configured so as to pass the thermal radiation along a first optical path from the focussing optics assembly to the thermal radiation detector assembly, and to pass the visible light along a second optical path from the visible light source assembly to the focussing optics assembly.The length of the first optical path is substantially equal to that of the second optical path, such that the focussing optics additionally forms a focussed image of the illuminated pattern of the visible light source assembly substantially on the focal plane, the illuminated pattern being configured to mark the location of the target region in the focal plane. The illuminated pattern includes a primary illumination region and at least one secondary illumination region, the primary illumination region having substantially the same lateral extent as the operative surface area of the thermal radiation detector assembly and being positioned such that the image of the primary illumination region formed at the focal plane falls substantially within and is substantially co-incident with the target region from which the thermal radiation detector assembly detects thermal radiation, and the at least one secondary illumination region being configured such that the image of the or each secondary illumination region formed at the focal plane is located outside the target region.
Abstract:
Optical computing devices are disclosed. One exemplary optical computing device includes an electromagnetic radiation source configured to optically interact with a sample and first and second integrated computational elements arranged in primary and reference channels, respectively. The first and second integrated computational elements produce first and second modified electromagnetic radiations, and a detector is arranged to receive the first and second modified electromagnetic radiations and generate an output signal corresponding to the characteristic of the sample.
Abstract:
A spectrometer assembly is provided having an optical transmission filter including a stack of continuous, non-patterned alternating dielectric and metal layers. Angle-dependent transmission wavelength shift of the optical transmission filter with continuous metal layers is small e.g. in comparison with multilayer dielectric filters, facilitating size reduction of the spectrometer assembly.
Abstract:
A multi-band aperture filter for optically coupling to a focal plane array (FPA) of a camera includes a substrate, and a first spectral coating on a first surface of the substrate that passes both a first longer and a second shorter wavelength band. A second spectral coating that passes the longer wavelength band and blocks the shorter wavelength band is on an outer annulus region, but not on an inner region on the first surface or a second surface of the substrate. The second spectral coating provides a larger aperture area for the longer wavelength band as compared to an aperture area for the shorter wavelength band to passively realize different F-numbers for the bands to provide substantially matched beam spot sizes on the detector array for the longer wavelength band and the shorter wavelength band, such as a long-wave infrared (LWIR) band and a mid-wave IR (MWIR) band.
Abstract:
A device is provided for mapping and for analysis of at least one element of interest included in a solid sample by laser-induced plasma optical emission spectrometry, enabling a high-resolution mapping, notably of elements such as hydrogen and oxygen, and is applicable to the fields of the nuclear industry and of aeronautics, and notably offers the advantage of not requiring costly installations. In one of the embodiments of the invention, a simultaneous mapping of elements such as hydrogen, oxygen and/or lithium is notably achievable.
Abstract:
There is provided an imaging device including an image sensor that performs photoelectric conversion on subject light to generate an image signal, a photographing optical system that forms an image of the subject light on the image sensor, and a first optical member that transmits the subject light incident on the image sensor via the photographing optical system. The first optical member changes transmittance of a first band of the subject light according to an angle with respect to an optical axis of the photographing optical system.