Noncontact Optical Fiber Sensor for Measuring the Refractive Index of Liquids

Table 1

Comparison of results with reported values.

Substance	Proposed refractometer (25°C)	Commercial Abbe refractometer (23.5°C)	Reported in literature; [2, 13–15]
Distilled water	1.3346	1.3344	1.3327 (25°C)
Hydrogen peroxide (40% wt)	1.3579	1.3625	1.3598 (25°C)
Glycerin	1.4757	1.4685	1.4739 (20°C)
Isopropyl alcohol	1.3798	1.3819	1.378 (20°C)