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利用光学中的全反射现象，并且采用电荷耦合器（ＣＣＤ）作为光电探测器，设计了光电式液体折射率测量系统。系统的量程为ｎ＝１．３３３０～１．３８２０，分辨率为５×１０－５，测量精度为３×１０－４。
Based on the phenomenon of total reflection in optics and the use of a charge-coupled device (CCD) as a photodetector, a photoelectric liquid refractive index measurement system is designed. System range for the n = 1.3330 ~ 1.3820, a resolution of 5 × 10-5, measurement accuracy of 3 × 10-4.