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光学ガラスは屈折率nd 、アッべ数υd がnd-υd図にある位置とガラスの組成によって、表1 の18グループに分類されています。 通过测量材料在不同应力下的光学性质变化,可以得 到应力光学系数的数值,并且可以根据这些数值来优化材料的光学 性能和力学性能。 应力光学系数是指由机械应力引起的双折射比。 应力光学系数在玻璃库中由4个数字进行定义:波长(以微米为单位)、应力光学系数K和两个光弹性系数K11和K12(以10-6mm²/N为单位)的加法逆元。 应力光学系数编辑器中最多可以定义100个数据点。
在干涉系统中,有一个重要的光学性能参数,叫做 应力光学系数 B (在一些教材中,也称为光弹性系数)。 在玻璃生产冷却退火的过程中,由于玻璃内外温度变化速率不同,引起内外结构差异,产生内应力。 本指导书依据ASTM C770-16 (2020)标准,详细规范了玻璃应力光学系数的三种测定方法(纤维拉伸法、四点弯曲法和矩形梁压缩法),包含仪器配置、试样制备、测试步骤及计算流程,适用于光学玻璃的质量控制与热残余应力分析。 应力一光学系数是材料的特征值,用于从应力双折射的删定结果确定应力的大小。 .定义对此项国际标准做如下定义力一光学系数双折射效应与施加到光学材料轴向应力的比值见IsO980,ASl“—一’式中K一应力一光学系数, S一光程盏Ja一祥品牛的光路长度此处与.
每种光学玻璃牌号按其所属的玻璃类别名称的代号再加序号组成。 此外,还用六位数字作 代码來表征每一个牌号,其中前三位数表示该牌号玻璃折射率小数点后三位数,后三位数字表 示该牌号玻璃阿贝数。例如:H-K9L, nd二1.51680, v d二64.20,其代码为517642。
光学玻璃光弹系数和折射率规格参数表 - 深圳市田野仪器有限公司 应力光学系数表示应力与应力双折射产 生的光程差之间的关系: δ= B·d·F 式中: δ—总光程差,nm; B—应力光学系数,/Pa; d—光在玻璃中通过的路程,cm; F—应力,Pa。 结果表明:玻璃应力光学系数取决于各氧化物组成和应力光学系数因子,具有加和性;应力光学系数随测试光源波长增加而减小,呈非线性关系;玻璃的应力光学系数与折射率的三次方 n3 、泊松比 μ 成正比,与弹性模量 E 成反比。
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