Spectral programmable analog light source for testing

Abstract

The inventive analog light source consists of an adjustable constant-current monochromatic LED array and a programming unit. LEDs of each unit are arranged in the central symmetry or the cross symmetry. The integral LED array is arranged with the monochromatic LED units. The programming unit can program as a specific spectrum structure, light intensity and its specific changing process and can be both a continuous output and a pulse output to be suitable for the needed measuring process, so it can be used for the spectral response measurement of the photosensitive element, the standard test of the solar cell and the spectral sectionalization test of the multifunction solar cell.

Description

technical field [0001] The invention relates to the fields of optics, optoelectronics and solar energy, in particular to a spectrum programmable analog light source for testing. Background technique [0002] The measurement of the spectral response of the photosensitive element needs to use a monochromator to generate monochromatic light with a variable wavelength to irradiate the tested element, measure its response value at different wavelengths, and then use a photosensitive element with known spectral response to calibrate to obtain the measured element. The spectral response of the photosensitive element, therefore, the wavelength-variable monochromatic light source is an important part of the spectral response measurement. Usually the monochromatic light source is obtained by grating or prism, and it can also be separated by laser to generate a limited number of monochromatic wavelengths. Light. [0003] In the field of solar energy applicatio...

AI Technical Summary

Problems solved by technology

[0003] In the field of solar energy applications, in order to measure the conversion performance of solar energy conversion components, a light source with a certain standard spectral distribution and intensity is specified as a standard test light source. In research and production, sunlight or other artificial simulated light sources are used as test light sources. Sunlight has an ideal Spectral distribution and light intensity, but affected by weather conditions and nights, it is not a reliable test light source, especially for production applications. The artificial simulated light sources are mainly xenon lamps and halogen tungsten lamps. After spectral correction, they can be used as test light sources, but the simulation The light source still has a large spectral deviation. In the solar cell test standard, the highest grade A analog light source allows a spectral deviation of less than 25%. Therefore, the highest grade A analog light source still cannot directly test different types of solar cells.

In addition, ground applications and aerospace applications use different spectral standards, so the analog light sources of the two cannot be used in common, that is, the analog light sources used on the ground cannot be used in space applications

[0004] In the field of solar cell applications, multi-junction cells are developing rapidly as a development direction of high-efficiency cells. The light source requirements for multi-junction solar cell testing are higher. On the one hand, the spectral deviation is required to be smaller. It is required that the light source has the function of adjusting the spectrum segment. The smaller spectral deviation can be obtained by using a composite light source and accurate spectrum correction. However, there is no ready-made product for the light source with adjustable spectrum segment. In reality, multiple independent light sources are used to adjust separately. desired effect

Images