Qifeng Xu, Bo Chen. Automatic Spot Location and Extraction Algorithm for Grating Wavefront Curvature Sensor[J]. Laser & Optoelectronics Progress, 2019, 56(22): 220101
- Laser & Optoelectronics Progress
- Vol. 56, Issue 22, 220101 (2019)
Fig. 1. Principle of curvature sensor based on Fresnel zone plate
Fig. 2. Flow chart of automatic spot location and extraction algorithm
Fig. 3. Experimental setup
Fig. 4. Experimental results of automatic spot location and extraction. (a) Original image; (b)binary image; (c) spot image 1; (d) spot image 2 (e) target spot 1; (f) target spot 2
Fig. 5. Wavefront restored by two sensors. (a) Wavefront 1 restored by CS; (b) wavefront 2 restored by CS; (c) wavefront 3 restored by CS; (d) wavefront 4 restored by CS; (e) wavefront 1 restored by HS; (f) wavefront 2 restored by HS; (g) wavefront 3 restored by HS; (h) wavefront 4 restored by HS
Fig. 6. Absolute deviation histogram of spot location. (a) D/r0=2; (b) D/r0=5; (c) D/r0=10; (d) D/r0=20
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Table 1. Comparison of measurement results (Wrms and dpv) obtained by CS and HSλ
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