折光法是通过测量物质的折光率来判别物质的组成，确定物质的纯度、浓度及判断物质的品质的分析方法。折光仪是利用临界角原理测定物质折射率的仪器，其种类很多，食品工业中最常用的是阿贝折光仪和手提式折光仪。
基于可溶性固形物的折射原理，用折光计法测定酱油中可溶性无盐固形物的含量，取得了与重量法基本一致的结果。
On the basis of the refraction principle of soluble solid, the content of the soluble saltless solid in soy sauce was determined by refractometry.
薄荷醇和薄荷酮含量的测定方法有旋光测定法、折光指数法及乙酰化法。
There are some other ways to analyzed the contents of menthol and menthone, such as polarimetry, refraction index method and acetylation method.
曲折光线法和解波动方程是分析平面光波导的基本方法。
The solving of wave equations and tortuous ray method are fundamental methods of analysing plane optical waveguiding.
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