Abstract:
Techniques are provided to perform flat field correction for infrared cameras using a liquid shutter. Devices and methods provide a focal plane array (FPA) that receives infrared radiation (e.g., thermal infrared radiation) from a scene, and infrared-opaque liquid disposed in a cavity of a liquid shutter housing, and a fluid controller that directs the liquid from a reservoir area of the cavity to a field of view area of the cavity to block the FPA from the infrared radiation. Flat field correction terms may be determined and radiometric calibration may be performed. In one example, a liquid shutter uses voltages to direct liquid. In another example, a liquid shutter uses magnetic fields from electromagnets to direct liquid such as ferrofluid. In another example, a liquid shutter uses electrowetting techniques to direct liquid such as water. In a further example, a liquid shutter uses a pump.
Abstract:
A system and method for performing field measurement and testing of a plurality of widely spaced laser beams used in visual warning technology (VWT). VWT uses a combination of widely spaced laser beams, to warn civilians from approaching too close to military security areas. The widely spaced laser beams are displaced using rhomboidal prisms. Each rhomboidal prism receives a corresponding laser beam and displaces it toward a collecting lens. The lens focuses the displaced beams received thereon onto an imaging sensor for testing. Beam shutters may be used for selectively blocking one or more beams in order to test the beams separately and in different combinations.
Abstract:
The invention relates to a radiation measuring device, especially for measuring high power radiation (10), comprising a measuring window (12) and a deflecting unit which can guide at least one part of the radiation which is to be measured (10) from the measuring window (12) to a sensor unit (14). According to the invention, the deflecting unit comprises at least one bar (16) into which the radiation (10) is injected via the measuring window (12), parallel to the longitudinal extension (18) thereof, via a side (70). The radiation is retransmitted along the longitudinal extension of the surface (18) bar to the sensor unit (14).
Abstract:
There is disclosed an optical radiation sensor system. The system includes a sensor device (140) and a cleaning device (115). The sensor device detects and responds to radiation from a radiation field (170) and includes a surface (155) that is movable with respect to the radiation field between a first position in which the surface is in the radiation field and a second position in which at least a portion of the surface is out of the radiation field. The cleaning device operates to remove fouling materials from at least a portion of the surface in the second position. The cleaning device may be a chemical cleaning device, a mechanical cleaning device or a combined chemical/mechanical device.
Abstract:
An testing device (1) for measuring the light characteristics of an electronic component (3), the testing device (1) comprising, an inlet (5) at one end at which an electronic component (3) can be presented for testing; a shutter (7) located at the inlet, wherein the shutter (7) is configured to be moveable between a first open position in which an electronic component (3) to be tested can be received into the inlet (5), and a second closed position in which the shutter (7) can overlay at least the majority of a nest (9) on which said electronic component (3) is supported, so that the shutter can prevent light emitted by the electronic component (3) from being diverted away from the testing device (1) by at least the majority of the nest (9) wherein the shutter (7) comprises at least one sliding door (15a, 15b9 which can be slid to move the shutter into its first open position, and slid to move the shutter (7) into its second closed position, and wherein the at least one sliding door (15a,15b) comprises a cut out portion (17) which defines said opening (11) when the shutter (7) is in its second closed position. There is further provided an assembly which include the testing device (1).
Abstract:
The present invention relates to a photodetecting device protected from contamination by organic materials secreted from a living matter in the case that a photodetector is used for investigating characteristics of the living matter, and which easily blocks the influence of an external magnetic field. The photodetecting device includes a protection window formed in the front side facing a measured object, and a magnetic shielding tube providing a space for installing components of the photodetecting device such as a variable shutter, movable lens, protection window, and incidence window. Additionally, the photodetecting device according to the present invention includes a drive means enabling remote control of photodetector movement, and provides an advantage that a tester may measure various points of a specimen more easily.
Abstract:
The invention is a pneumatically actuated energy collection device. The device includes a support which has an energy collector thereon. A shutter is slidably attached to the support and can be moved between a first "closed" position and a second "open" position. In its first position, the shutter covers the collector and in its second position, the shutter uncovers the collector. The shutter is biased into one of the positions. A chamber is disposed adjacent to the shutter so that when the chamber is pressurized, the shutter bias is overcome and the shutter is moved between the first position and the second position.
Abstract:
An optical sensing device for using light to locate objects or features in a field of view comprises a light source; a controllable lens having two states and being controllable between them, for example a multifocal lens having two or more foci for focusing light from the light source; and a sensor able to sense light reflected from an object, to determine information of the object. The use of two or more foci adds dynamic range to optical sensing to allow for reliable detection over a wide range of distances.
Abstract:
A method and apparatus are provided for processing light from a light source. The method includes the steps of measuring a predetermined set of characteristics of the light source and detecting flicker when the predetermined set of characteristics exceed a corresponding flicker fusion threshold value.