Abstract:
The invention relates to a matrix device for the detection of light radiation with individual cold screens integrated into a substrate and to its production process. This device comprises detectors arranged in matrix-like manner and defined in a detection material, a substrate which is transparent to the radiation to be detected and on which is epitaxied the detection material and provided in its upper part with blind holes distributed in matrix-like manner, each hole being positioned facing a detector, a layer of anti-reflecting transparent material covering the bottom of the holes and a layer of a material absorbing the radiation covering the upper face of the substrate and the walls of the holes.The invention more particularly applies to an infrared imaging system.
Abstract:
A non-destructive testing instrument useful for measuring of organic constituents of materials utilizes interactance of near infrared radiation from near infrared emitting diodes positioned at one end of a light transmitting cylinder having a length sufficient so that diode point sources provide uniform radiation at the other end of the cylinder, the cylinder being shielded from light. A detector, which may be inside the cylinder, detects the interactance from such radiation to provide a measurement of body fat utilizing a unique formula and unique measuring technique to prevent noise and incorrect measurements.
Abstract:
A gas measuring device has a source capable of emitting a beam of radiation aligned to impinge a detector. A housing means encloses the beam. The housing means has a plurality of apertures permitting the gas to enter the housing means, to intercept the beam, and to exit from the housing means. The device further comprises means to control the amount of thermal radiation reaching the detector.
Abstract:
Method of detecting pinhole defects in sheet materials for example tin plate, galvanized steel and thin metallic foils. A modulated ultra-violet light source is directed at right angles onto the advancing sheet material, the edges of the sheet material are shielded from both ambient and ultra-violet light, all non-ultra-violet light is shielded out from beneath the advancing strip, ultra-violet light which has been transmitted through the pinhole defects and said filtering is photomultiplied as a function of pinhole defects in the advancing material. The method is distinguished from prior art in collimating the ultraviolet light source so as to transmit the light at a right angle to the direction of motion of the sheet material and independently baffling the photomultiplier units with respect to each other, so as to define precise lineal zones of detection in said advancing material.
Abstract:
In order to detect can weld side-seam flaws or defects an infrared sensitive detector head is used. A collimator fiber optics or an optical mask are used to give a higher resolution. Optical fibers may have a second coating of EMA or an occasional optically absorbent fiber may be placed parallel to the optic fibers in order to cut down crosstalk and introduce an absorbent medium between the fibers. Coherent fiber optics may be used.
Abstract:
A system for optical imaging of a thick specimen (1) that permits rapid acquisition of data necessary for tomographic reconstruction of the three-dimensional (3D) image. One method involves the scanning of the focal plane of an imaging system (60, 61) and integrating the range of focal planes onto a detector (43). The focal plane of an optical imaging system (60, 61) is scanned along the axis perpendicular to said plane through the thickness of a specimen (1) during a single detector exposure. Secondly, methods for reducing light scatter when using illumination point sources (11) are presented. Both approaches yield shadowgrams. This process is repeated from multiple perspectives, either in series using a single illumination/detection subsystem, or in parallel using several illumination/detection subsystems. A set of pseudo-projections is generated, which are input to a three dimensional tomographic image reconstruction algorithm (74).
Abstract:
Motion correction for optical tomographic imaging in three dimensions. An object of interest (1) is illuminated to produce an image (111). A lateral offset correction value is determined for the image (114). An axial offset correction value is determined for the image 115). The lateral offset correction value and the axial offset correction value are applied to the image to produce a corrected file image (116).
Abstract:
A system, method and apparatus for taking a Raman spectrum of a sample is disclosed. In one embodiment, for example, an integrated Raman spectrometer (120) is provided. In another embodiment, a portable Raman spectrometer (320) is provided. In another embodiment, a Raman spectrometer (20) is provided comprising a collimated beam tube (32) for transmitting excitation radiation to an external optical system, such as a microscope (430), a telescope or a camera lens. In another embodiment, a method for correcting a Raman spectrum for background interference is provided. In yet another embodiment, a method for rejecting fluorescence in a Raman spectrometer is provided. A chemical reactor (930) comprising a built-in Raman detector for monitoring a chemical reaction in a reaction chamber of the reactor is also provided.
Abstract:
A method for three dimensional (3D) reconstruction of an object of interest (1), includes the step of packing objects of interest into a linear container (31). An object of interest (1) is illuminated with at least one optical projection beam (13). The linear container (32) is translated until the object of interest (1) is located within a region of the at least one optical projection beam (13). The object of interest (33) is centered as necessary and rotated through a plurality of radial angles to generate a set of projection images (34) at each radial angle of the plurality of angles.
Abstract:
Apparatus for detecting particulates (46) within a medium in a chamber (10) comprises a photo-detector (14) which is maintained at a stable low temperature by a Peltier type cooling device (42). Scattered light from the particulate (46) is focussed by a spherical lens (34) onto the input face (30) of a rod lens (22). The latter has an optical pitch of 0.5 and transfers the image to its output face (25) whence it passes via a light pipe (18) to the sensitive area (16) of the photo-electric device (14). The rod lens (22) provides an inexpensive means for transferring the light and which provides a thermal barrier. Thus, although the photo-electric device (14) is held at a low temperature, the input face (30) of the rod lens (22) can be held at the temperature of the medium within the chamber (10) and is not subjected to the formation of mist or ice. The lens (34) is mounted by means of a collar (28) which is slidable into a position in which the lens (34) focusses the input light onto the face (30) of the lens (22), and then secured in this position by ultra-violet-cured adhesive fillets (32, 34).