Abstract:
A system (100) for generating uniform monochromatic electromagnetic radiation that include an electromagnetic radiation source (104) and a bandpass filter assembly (116) to filter electromagnetic radiation emitted by the electromagnetic radiation source. The system also includes an optical integrating sphere (124) to receive the filtered electromagnetic radiation and to uniformly scatter the filtered electromagnetic radiation within the optical integrating sphere, wherein the optical integrating sphere comprises an output (126) to emit the uniformly scattered, filtered electromagnetic radiation.
Abstract:
A system (100) for generating uniform monochromatic electromagnetic radiation that include an electromagnetic radiation source (104) and a bandpass filter assembly (116) to filter electromagnetic radiation emitted by the electromagnetic radiation source. The system also includes an optical integrating sphere (124) to receive the filtered electromagnetic radiation and to uniformly scatter the filtered electromagnetic radiation within the optical integrating sphere, wherein the optical integrating sphere comprises an output (126) to emit the uniformly scattered, filtered electromagnetic radiation.
Abstract:
Provided are a light source evaluation device, a light source adjustment system, a light source evaluation system, and a light source evaluation method whereby it is possible to evaluate the characteristics of a solar simulator, which is a light source for measuring the characteristics of a solar cell, without creating a reference cell or pseudo cell tailored to the spectral sensitivity of a solar cell to be measured. Said evaluation is performed by calculating an evaluation value of the characteristics of the light emitted by a solar simulator in comparison to natural sunlight on the basis of the spectral irradiance of the light emitted by a solar simulator as measured by a spectroradiometer, the spectral irradiance of natural sunlight, and the pre-measured spectral sensitivity of the solar cell to be measured.
Abstract:
A sample (OBJ1) that is an object whose quantum efficiency is to be measured, and a standard object (REF1) having a known reflectance characteristic are each attached to a sample window (2) provided in a plane mirror (5). Based on respective spectrums measured by a spectrometer in respective cases where the sample (OBJ1) is attached and the standard object (REF1) is attached, the quantum efficiency of the sample (OBJ1) is measured. The plane of an opening of an observation window (3) is made substantially coincident with the exposed surface of the sample (OBJ1) or standard object (REF1), so that direct incidence, on the observation window (3), of the fluorescence generated from the sample (OBJ1) receiving an excitation light (L1) and the excitation light (L1) reflected from sample (OBJ1) is prevented.
Abstract:
A spectrometer is provided with an integrating sphere 20, inside which a sample S of a measurement target is disposed and which is adapted for observing measured light emitted from the sample S, and a Dewar vessel 50 which retains a refrigerant R for cooling the sample S and at least a portion of which is located so as to face the interior of the integrating sphere 20. Gas generated from the refrigerant R is introduced through predetermined gaps G1-G6 functioning as a gas introduction path and through a plurality of communicating passages 64 formed in a support pedestal 61, into the integrating sphere 20. The gas introduced into the integrating sphere 20 absorbs water in the integrating sphere 20 to decrease the temperature in the integrating sphere 20, so as to prevent dew condensation from occurring on a portion of a second container portion 50b of the Dewar vessel 50 exposed in the integrating sphere 20. This can prevent occurrence of dew condensation even in the case where the sample S is measured in a cooled state at a desired temperature.
Abstract:
A photodetecting device 1 includes an integrating sphere 20 for observing light to be measured generated according to irradiation of a sample with excitation light and a sample holder 60 removably attached to the integrating sphere 20, the integrating sphere 20 has an excitation light introducing hole 201 for introducing the excitation light and a sample introducing hole 205 for introducing a cell C held by the sample holder 60, the sample holder 60 is locked to the sample introducing hole 205 and holds the cell C for accommodating the sample, and the cell is disposed so that an entrance surface of the cell C, through which the excitation light enters the cell C, inclines relative to the surface perpendicular to the optical axis L of the excitation light.
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:
The method and apparatus of the present invention provides a system wherein light-emitting diodes (LEDs) (162) can be tuned within a given range by selecting their operating drive current in order to obtain a precise wavelength. The present invention further provides a manner in which to calibrate and utilize an LED probe (150), such that the shift in wavelength for a known change in drive current is a known quantity. In general, the principle of wavelength shift for current drive changes for LEDs is utilized in order to allow better calibration and added flexibility in the use of LED sensors, particularly in applications when the precise wavelength is needed in order to obtain accurate measurements. The present invention also provides a system in which it is not necessary to know precise wavelengths of LEDs where precise wavelengths were needed in the past. Finally, the present invention provides a method and apparatus for determining the operating wavelength of a light-emitting element such a light-emitting diode.