Abstract:
There is disclosed an apparatus for testing concentration-type solar cells. The apparatus includes a light source for emitting light, a focusing unit for focusing the light emitted from the light source and turning the same into a light beam, a testing unit for testing any one of solar cells of a wafer; and a wafer-positioning unit for moving the wafer horizontally and vertically, thus brining a targeted one of the solar cells into contact with the testing unit.
Abstract:
A machine (100) and methods (400) measure a characteristic of an optical signal (35) incident upon a detector (50) characterized by one or more dynamic response parameters. One method (400) receives (450) an output signal (60) from the detector (50) and compares (460) that output signal (60) and a computationally determined response (610, 710, 810, 910, 1110, 1210) of the detector (50) to a known optical signal incident upon the detector (50). The response (610, 710, 810, 910, 1110, 1210) is based on said one or more dynamic parameters. The method (400) determines (470) the characteristic based on a relationship between the output signal (60) and the computationally determined response (610, 710, 810, 910, 1110, 1210). Another method (400) observes (450) an output signal (60) from an optical detector (50) detecting one or more optical signals (35), accesses (410) a characteristic curve (610, 710, 810, 910, 1110, 1210) of detector response, compares (460) the observed output signal (60) to the characteristic curve (610, 710, 810, 910, 1110, 1210), and calculates (470) at least one characteristic of one or more optical signals (35) based on a relationship of the observed output signal (60) and the characteristic curve (610, 710, 810, 910, 1110, 1210).
Abstract:
A system (10) provides white light having a selectable spectral characteristic (e.g. a selectable color temperature) using an optical integrating cavity (11) to combine energy of different wavelengths from different sources with white light. The cavity has a diffusively reflective interior surface and an aperture (17) for allowing emission of combined light. Control of the intensity of emission of the sources sets the amount of primary color light of each wavelength added to the substantially white input light output and thus determines a spectral characteristic of the white light output through the aperture. A variety of different elements may optically process the combined light output, such a deflector, a variable iris, and a lens a variable focusing lenses system, a collimator, a holographic diffuser and combinations thereof.
Abstract:
A desired color of illumination of a subject is achieved by determining settings for color inputs and applying those setting to one or more systems that generate and mix colors of light, so as to provide combined light of the desired character. In the examples of appropriate systems (10), an optical integrating cavity (11) diffusely reflects light of three or more colors, and combined light emerging from an aperture of the cavity illuminates the subject. System settings for amounts of the different colors of the input lights (19) are easily recorded for reuse or for transfer and use in other systems.
Abstract:
Die Erfindung betrifft eine Vorrichtung zur mehrstufigen Dämpfung einfallender Strahlungsenergie, insbesondere zur Kalibrierung von bildgestützten Instrumenten zur Fernerkundung der Erde. Die Aufgabe, eine neue Möglichkeit zur definierten mehrstufigen Dämpfung einer Konstantlichtquelle zu finden, die mit einfachen Mitteln eine zuverlässige und langzeitstabile reproduzierbare Einstellung von definierten Strahlungszuständen, insbesondere für die Mehrpunktkalibrierung von Sensoren, gestattet, wird erfindungsgemäß gelöst, indem Filter mit unterschiedlicher Transmission als begrenzte Anzahl von Filterplatten (3; 31, 32) mit beliebig hergestellter Transmissionsstruktur in einem Lichtschacht (2), der einen Kalibrierstrahlengang darstellt, hintereinander aperturfüllend einsetzbar sind, so dass sie jeweils einzeln und in Kombinationen miteinander eine Anzahl von definierten, reproduzierbar abgestuften Dämpfungszuständen des Lichts einer Referenzstrahlungsquelle (1), die die Anzahl der Filterplatten (3; 31, 32) übersteigt, erzeugen.
Abstract:
Eine Bewitterungsvorrichtung weist eine oder mehrere UV-Strahlungsquellen (2) und einen oder mehrere erste Sensor(en) (3) auf, die für einen ersten spektralen Empfindlichkeitsbereich kalibriert sind. In einem ersten Aspekt der Erfindung ist der oder einer der ersten Sensor(en) (3) derart kalibriert, dass aus seinem Ausgangssignal die Strahlungsleistung eines innerhalb des ersten Empfindlichkeitsbereich liegenden spektralen Bereichs ermittelbar ist. In einem zweiten Aspekt der Erfindung ist ein zweiter Sensor (4) vorgesehen, welcher für einen zweiten spektralen Empfindlichkeitsbereich kalibriert ist.
Abstract:
A desired color of illumination of a subject is achieved by determining settings for color inputs and applying those setting to one or more systems that generate and mix colors of light, so as to provide combined light of the desired character. In the examples of appropriate systems (10), an optical integrating cavity (11) diffusely reflects light of three or more colors, and combined light emerging from an aperture of the cavity illuminates the subject. System settings for amounts of the different colors of the input lights (19) are easily recorded for reuse or for transfer and use in other systems.
Abstract:
This invention provides a solar simulator measurement method capable of high-accuracy measurements with fast-response photovoltaic devices as well as with slow-response photovoltaic devices, and a solar simulator for implementing the method. A flash having a pulse wave form with a flattened peak is generated from a xenon lamp 1. The flash is sensed by an irradiance detector 3, its irradiance measured, and the irradiance of the light source is adjusted to fall within a prescribed narrow range based on the detected irradiance value. Then, the flash with irradiance within the prescribed range irradiates photovoltaic devices 4 under measurement, and the current and the voltage output by the photovoltaic devices 4 are measured at multiple points while a load of the photovoltaic devices 4 is controlled. This process is repeated with multiple flashes to obtain an I-V curve for the photovoltaic devices.
Abstract:
A system for measuring optical detector linearity according to the present invention employs a laser source that illuminates an integrating sphere. The sphere randomizes the laser signal phase and produces a uniform intensity over the sphere output. A collimator expands the sphere output for entry into an interferometer, where the incident optical energy is amplitude modulated in a sinusoidal fashion by a linear mechanical mirror movement. Optical band filters eliminate significant harmonic content being present on a pre-detected optical signal. Sampling of the detected signal energy is performed synchronous to the mechanical mirror position to assure sinusoidal response. The sampled signals are processed to separately determine signal harmonic components attributed to detector non-linearity and multiple laser reflections within the system. The system utilizes at least two measurements at two different laser intensities. An optional third measurement of background radiance may be applied to the first two measurements to enhance accuracy.
Abstract:
The present invention provides a luminescent device (1) comprising a gaseous tritium light source (GTLS) (3). The GTLS (3) is held within a housing (2) which may optionally be located in an outer casing. A filter, such as a neutral density filter, may be used to modify the light output to predetermined levels. The device may be used to calibrate apparatus used to measure optical output, such as a luminometer.