Abstract:
The present disclosure relates to limitation of noise on light detectors using an aperture. One example embodiment includes a system. The system includes a lens disposed relative to a scene and configured to focus light from the scene onto a focal plane. The system also includes an aperture defined within an opaque material disposed at the focal plane of the lens. The aperture has a cross-sectional area. In addition, the system includes an array of light detectors disposed on a side of the focal plane opposite the lens and configured to intercept and detect diverging light focused by the lens and transmitted through the aperture. A cross-sectional area of the array of light detectors that intercepts the diverging light is greater than the cross-sectional area of the aperture.
Abstract:
A system includes a source of laser beams forming an array, a source of a reference laser beam, and an optical detector for measuring respective phase differences between the array laser beams and the reference laser beam. The system includes a mask, having apertures with a shape, size and position identical to a shape, size and position of the array laser beams, and positioned in the reference laser beam to form respective beams of the reference laser beam corresponding to the beams from the array laser beams. A phase modulator phase modulates respective beams of one of (a) the array laser beams and (b) the beams of the reference laser from the mask. A photodetector receives the respective array laser beams and the corresponding reference laser beams from the mask to generate a composite signal. Processing circuitry is responsive to the composite signal for generating respective signals representing the phase differences of the individual laser beams from the reference laser beam.
Abstract:
A photoreceiver device includes a light detector connected between a power supply node and a first node, and first to third switching elements. The light detector is configured to detect an incident optical data signal, and to output photocurrent corresponding to a magnitude of the optical data signal through the first node. The first switching element is connected between the first node and a ground node. The second switching element is connected between the power supply node and a second node. The third switching element is connected between the second node and the ground node. The third switching element has a control node connected to the first node.
Abstract:
A light detection device includes a light detector including a first detector and a second detector; a light coupling layer disposed on or above the light detector; and a polarizer array that is disposed on the light coupling layer. The light coupling layer includes a first low-refractive-index layer, a first high-refractive-index layer including a first grating and a second grating adjacent to the first grating, and a second low-refractive-index layer in this order. The polarizer array includes a first polarizer that transmits light polarized in one direction and a second polarizer that is adjacent to the first polarizer and blocks the light polarized in the one direction. The first grating and the first polarizer face the first detector, and the second grating and the second polarizer face the second detector.
Abstract:
A light sensor assembly includes a base configured to be fixedly mounted to a housing of a light fixture. The base holds contacts configured to be electrically connected to terminals of the light fixture. A photocell module is provided on the base and includes a photocell electrically connected to the contacts. A sensor lid is coupled to the base. The sensor lid has a lightpipe directing light from an exterior of the sensor lid to the photocell. The sensor lid is variably positionable at different angular positions relative to the base to change an orientation of the lightpipe relative to the photocell.
Abstract:
The present disclosure relates to focusing luminescent concentrators wherein directional emission, obtained by placing an absorber/emitter within a microcavity or photonic crystal, may be oriented by a macroscopic concentrator and focused to a point or line for 3D or 2D concentration, respectively. The focusing luminescent concentrators disclosed herein may provide high concentration ratios without the need for tracking, and may reduce re-absorption losses associated with conventional concentrators. The present disclosure further relates to photovoltaic cells and/or optical detector devices comprising a focusing luminescent concentrator. The devices and methods presently disclosed are also useful, for example, in solar, thermal and thermophotovolatic applications.
Abstract:
An endoscope includes: a first objective lens that causes an image of a first object to be observed to be formed; a second objective lens that causes an image of a second object to be observed to be formed; a light guide that guides illuminating light from a light source to an insertion portion; a light distribution member that distributes light from the light guide between a first observation direction and a second observation direction; a light amount varying portion for changing light amount proportions with respect to light emitted in the first observation direction and light emitted in the second observation direction; a distance detection portion that measures a second distance between the second objective lens and an object to be observed in the second observation direction; and a control portion that controls the light amount varying portion based on a second distance signal.
Abstract:
An automatically adjustable method for use in opto-acoustic metrology or other types of metrology operations is described. The method includes modifying the operation of a metrology system that uses a PSD style sensor arrangement. The method may be used to quickly adjust the operation of a metrology system to ensure that the data obtained therefrom are of the desired quality. Further, the method is useful in searching for and optimizing data that is or can be correlated to substrate or sample features or characteristics that of interest. Apparatus and computer readable media are also described.
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:
In some applications, it may be desirable to position multiple photodetectors at precise locations on a curved focal surface defined by an optical system. To achieve this positioning, the photodetectors may be mounted at desired locations on a flexible substrate that is in a flat configuration. The flexible substrate with mounted photodetectors can then be shaped to substantially conform to the shape of the curved focal surface. This shaping can be accomplished by clamping the flexible substrate between at least two clamping pieces. The curved flexible substrate clamped between the at least two clamping pieces can be positioned relative to the optical system such that the photodetectors are positioned at desired three-dimensional locations on the curved focal surface.