Abstract:
A solar simulator includes a light source, an optical reflection element positioned behind the light source to reflect light emitted from the light source in a form of pseudo parallel light, a low-angle light-diffusion optical element for diffusing the reflected light from the optical reflection element at a low diffusion angle, and a parallel light conversion optical element including a number of air holes arranged in parallel rows and provided with faculties for transmitting incident light parallel to the axis of the air holes to absorb or attenuate nonparallel incident light. The parallel light conversion optical element converts the incident light from the low-angle light-diffusion optical element to parallel light and emits the converted parallel light.
Abstract:
Disclosed is a method for testing a light-emitting device comprising the steps of: providing an integrating sphere comprising an inlet port and a first exit port; disposing the light-emitting device close to the inlet port of the integrating sphere; providing a current source to drive the light-emitting device to form an image of the light-emitting device in driven state; providing an image receiving device and to receive the image of the light-emitting device, wherein the image receiving device is connected to the first exit port of the integrating sphere; and determining a luminous intensity of the light-emitting device according to the image. An apparatus for testing a light-emitting device is also disclosed. The apparatus for testing a light-emitting device comprises: an integrating sphere comprising an inlet port and a first exit port, wherein the light-emitting device is disposed close to the inlet port of the integrating sphere; an image receiving device connected to the first exit port of the integrating sphere for receiving an image of the light-emitting device; and a processing unit coupled to image receiving device for determining a luminous intensity of the light-emitting device.
Abstract:
An image display apparatus according to the present invention, comprises: a display panel displaying an image on a screen; and a photometric unit measuring light incident from the screen, wherein the photometric unit includes: a sensor measuring the incident light; and a light guide unit refracting the incident light and guiding the refracted light to the sensor.
Abstract:
A detecting apparatus for detecting an object includes at least a screen, at least a detecting unit and at least a holding unit. The screen is partial light-permeable and has a first surface and an opposite second surface. The object is disposed adjacent to the first surface of the screen. The detecting unit is disposed corresponding to the object and located adjacent to the second surface of the screen. The holding unit holds the relative distances between the screen, the object and the detecting unit. The detecting unit captures the image of the second surface of the screen so as to calculate the optical field distribution of the object. The detecting apparatus can measure the optical field distribution of an object quickly and has the advantages of low cost and high accuracy.
Abstract:
Light sensors (1) are used in lighting applications, especially in combination with LEDs, to control and/or adapt the color point of light sources. Costs and/or performance of the light sensor (1) are essential in order to guarantee cost-effective light sources with reproducible color points. This aim is achieved by a light sensor (1) comprising a light diffuser (10), an optical non-transparent housing (11) having at least one window (12), at least one interference filter (13) and at least two photo sensors (14). The light diffuser (10) is arranged in such a way that light from outside the optical non-transparent housing (11) has to pass the light diffuser (10) so as to enter the interior of the optical non-transparent housing (11) via the window (12). The interference filter (13) and the at least two photo sensors (14) are arranged in the interior of the optical non-transparent housing (11), which interference filter (13) is arranged between the window (12) and the at least two photo sensors (14).
Abstract:
The present invention relates to a solid-state based light source, a corresponding circuitry and a method of emitting light, including one or more light source elements for generating light, a first sensor for receiving light emitted by the light source elements and ambient light and for generating a first sensor signal (S1) representing the received light, a second sensor for only receiving ambient light and for generating a second sensor signal (S2) representing the received ambient light. Moreover, the solid-state based light source comprises a control unit for receiving the first and the second sensor signals (S1, S2) and for generating control signals (Sc) for controlling the light source elements, based on the difference between the first and the second sensor signals (S1, S2), to compensate for the influence of the ambient light.
Abstract:
A power and energy (PE) meter includes a sensor head comprising a sensor which absorbs EM radiation that impinges on it, and a heat sink with which the sensor is in thermal contact. The heat sink includes a through-hole behind the sensor which allows at least some of the EM radiation which is not absorbed by the sensor to pass through the heat sink without being absorbed. A means of applying mechanical pressure is preferably employed to hold the sensor in thermal contact with the heat sink. A capture head and shroud may be mounted behind and physically separate from the sensor head, and arranged to absorb at least some of the radiation which is not absorbed by the sensor head.
Abstract:
Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base. Such methods and implements may be desirably utilized for purposes of detecting and preventing counterfeiting or the like.
Abstract:
A direct-light-type backlight module uses optical feedback to control point light sources for obtaining a default luminance. Each point light source drives a section in a cyclic time domain to em it a light. A photo detector detects a brightness and the brightness is thus control led by the optical feedback from the photo detector.
Abstract:
A photosensor with customizable angular-response characteristics is presented. This photosensor includes a light-modifier located between the photosensor and a target area to be monitored by the photosensor, wherein the light-modifier provides a customizable angular response for light received at the photosensor from the target area.