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一般地说,我们要求纤维光学元件在光学性能方面数值孔径大,透光性能好,分辨率高,对比度好。本讲以光学纤维面板(以下简称为面板)为例来讨论它的几个主要特性的测量原理和一般测量方法。一、面板数值孔径的测量面板的数值孔径是表明它集光能力大小的一个基本参数。理论上面板的数值孔径可根据公式NA=(n_1~2-n_2~2)~(1/2)计算得到,式中n_1为芯玻璃折射率,n_2为涂层玻璃折射率。实际上,由于控制纤维的过程中芯玻璃和涂层玻璃互相渗透,在两者间形成一个过渡层,过渡层中的玻璃折射率不等于n_1,也不等于n_2,因此使数值孔
In general, we require that fiber optics have large numerical apertures in optical properties, good light transmission, high resolution and good contrast. This talk about the optical fiber panel (hereinafter referred to as the panel) as an example to discuss its main features of several measurement principles and general measurement methods. First, the numerical aperture of the panel The numerical aperture of the measurement panel is a basic parameter that indicates the size of the light gathering capability. Theoretically the numerical aperture of the panel can be calculated according to the formula NA = (n_1 ~ 2-n_2 ~ 2) ~ (1/2), where n_1 is the refractive index of the core glass and n_2 is the refractive index of the coated glass. In fact, because the core glass and the coating glass permeate each other during the process of controlling the fiber, a transition layer is formed between them, and the refractive index of the glass in the transition layer is not equal to n_1 and not equal to n_2, so that the numerical aperture