应用于深海环境的LED光源模组采用封装硅胶作为压力补偿结构介质, 与传统液压补偿结构相比, 具有装配方便、结构简便等优点。根据折射定律(斯涅尔定律), 不同封装硅胶折射率的差异会导致光线在蓝宝石透镜窗口发生全反射的角度有所不同, 进而影响出光光通量。因此, 本文探究了封装硅胶不同折射率(1.41～1.55)以及不同厚度(1.6～3.0 mm)对光源模组出光光通量的影响。Tracepro仿真结果表明, 固定封装厚度, 光通量随封装硅胶的折射率减小而增大; 固定硅胶折射率, 封装厚度为2.5 mm时, 光源的出光光通量最大。同时, 本文设计了硅胶封装实验, 实验结果与仿真结果一致, 验证了仿真结果的准确性。

The LED light source module applied in the deep sea environment adopts encapsulated silica gel as the pressure compensation structure medium, which has the advantages of convenient assembly and simple structure compared with the traditional hydraulic compensation structure. According to the law of refraction(Snells Law), the difference in the refractive index of different encapsulated silica gel will lead to different angles of total reflection of light in the sapphire lens window, thus affecting the light flux. Therefore, this paper explores the influence of different refractive index (1.41 to 1.55) and different thickness(1.6 mm to 3.0 mm) of encapsulated silica gel on the output light flux of the light source module. Tracepro simulation results show that the optical flux increases with the decrease of the refractive index of encapsulated silica gel. When the silica gel refractive index is fixed and the package thickness is 2.5 mm, the luminous flux of the light source reaches the maximum. At the same time, this paper designs the silica gel encapsulation experiment. The experimental results are consistent with the simulation results, further verifying the accuracy of the simulation results.