Brightness generator

Abstract

The invention discloses a brightness generator. The brightness generator comprises an integrating sphere provided with a round light outlet; the whole or part of the integrating sphere is arranged in a housing, the edge of the light outlet is provided with photoelectric probes which are symmetrically distributed around the light outlet, and the spherical surface of the integrating sphere is also provided with light sources which are symmetrically distributed around the light outlet. By regulating the input power of each light source or turning on / off each light source, the uniformity and the adjustability of the radiance of the light outlet is ensured, a large-area standard brightness source is realized, and the brightness generator is easy to achieve the high stability of color temperature and brightness output with high homogeneous degree.

Description

【Technical field】 [0001] The invention belongs to the field of optical radiation measurement, in particular to a brightness generator. 【Background technique】 [0002] In the field of high-precision optical radiation measurement, a light source with good uniformity of illuminance / luminance is often required to realize the calibration and measurement of the photoelectric probe. The standard luminance source is generally realized by using a light source plus an integrating sphere: the light emitted by the light source is mixed by the integrating sphere , emerge from the light exit window of the integrating sphere to provide surface light source output. However, due to the instability of the light source, the mechanical defects of the integrating sphere itself, and the uneven coating, the irradiance / radiance at the exit window of the existing integrating sphere brightness source cannot be completely uniform, especially when the integrating sphere When the diameter of the light ...

AI Technical Summary

Problems solved by technology

However, due to the instability of the light source, the mechanical defects of the integrating sphere itself, and the uneven coating, the irradiance / radiance at the exit window of the existing integrating sphere brightness source cannot be completely uniform, especially when the integrating sphere When the diameter of the light outlet is relatively large

Moreover, uniformity and color temperature stability are difficult to guarantee when adjusting the output irradiance / radiance of a luminance source

This will bring large measurement errors to operations such as probe calibration

Images