Jinming Luo, Jiawei Gu, Junhao Li, Rouyan Zhou, Dingnan Deng. Error Analysis and Improvement of Liquid Refractive Index Measurement Using Laser Speckle Interferometry[J]. Laser & Optoelectronics Progress, 2022, 59(5): 0512001
- Laser & Optoelectronics Progress
- Vol. 59, Issue 5, 0512001 (2022)
Fig. 1. Optical refraction characteristic of transparent medium
Fig. 2. Analysis of measurement error using internal standard method
Fig. 3. Vertical views of double-grooves structure with the left measured liquid. (a) In parallel; (b) tilt small angle placement
Fig. 4. Schematic of the improved liquid refractive index measurement system
Fig. 5. Digital speckle correlation results of water refractive index using internal standard method. (a) Air; (b) ethanol
Fig. 6. Digital speckle correlation results of water refractive index using improved method under different groove widths. (a) 5 mm; (b) 10 mm; (c) 20 mm
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Table 1. Data of water refractive index using internal standard method
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Table 2. Measurement data of water refractive index
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Table 3. Measurement data of ethanol refractive index
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