Lei Zhao, Jian Bai, Weidong Fang. Focal Length Measurement Method for Lenses with Small Aperture and Long Focal Length[J]. Acta Optica Sinica, 2020, 40(4): 0412002
- Acta Optica Sinica
- Vol. 40, Issue 4, 0412002 (2020)
Fig. 1. Schematic of experimental arrangement
Fig. 2. Schematic of Moire fringe generation
Fig. 3. Schematic of optical system
Fig. 4. Schematic of optical system for plano-concave lens
Fig. 5. Photograph of long focal-length testing system
Fig. 6. Moire fringes near optimal measuring position. (a) Before optimal measuring position; (b) at optimal measuring position; (c) after optimal measuring position
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Table 1. Parameters of lens to be tested
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Table 2. Comparison of focal-length test with different curvature radiuses
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