Because the near eye display (NED) device mainly displays its imaging effect with a unique virtual image, in essence, compared with the traditional display device, the measurement requirements and methods of brightness, light leakage ratio and other related parameters have also changed. By analyzing the imaging characteristics of optical waveguide AR display equipment, a comparative test scheme for brightness and light leakage ratio is proposed. The same type of arrayed optical waveguide NED module is experimentally measured by using equipment with different test principles, and the measurement results are compared and analyzed. The research results show that the measurement results of the ordinary aiming point luminance meter are not the luminance values in the real display. For the measurement of a certain illumination degree of the equipment, the luminance value and light leakage measured by the aiming point luminance meter have lower deviation than that measured by the two-dimensional imaging luminance meter. Therefore, in the process of testing NED, it is necessary to correctly select the measuring instrument according to its imaging characteristics, the size of the area to be tested and the test scene.
With the goal of carbon reduction and elimination in various countries, how to manage and achieve carbon footprint quantification and greenhouse gas emission accounting has become one of the key research tasks in low carbon manufacturing of electromechanical products. In order to provide users with a deeper understanding of the carbon emissions of purchased and used electromechanical products, we propose an idea of constructing a carbon footprint label (CFL) for the life cycle of electromechanical products using a hierarchical structure tree of electromechanical products. After the bibliometric analysis of the industrial-level knowledge graph research contents in the past decade, the construction method of knowledge graph in the field of electromechanical products is clarified. Based on the constructed CFL ontology model of mechanical and electrical products, a CFL representation model of electromechanical products based on knowledge graph is established. The CFL records the carbon emission data in the life cycle of mechanical and electrical products, making the CFL a new attribute of products, and providing targeted CFL representation of electromechanical products for low carbon designers.
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