Yongfeng Zhang, Hao Xian. Piston sensing via a dispersed fringe sensor with a merit-function-based active scanning algorithm at low light levels[J]. Chinese Optics Letters, 2019, 17(12): 121101
- Chinese Optics Letters
- Vol. 17, Issue 12, 121101 (2019)
Fig. 1. Geometry of DFS.
Fig. 2. Relation between
Fig. 3. Flow chart of the algorithm introduced in this Letter.
Fig. 4.
Fig. 5. Signal for a piston error of 42 μm. When the displacement of the actuator is −42 μm, the normalized merit function reaches its maximum.
Fig. 6. Two realizations of noisy DFP for different SNRs: (a) SNR is 1, (b) SNR is 5.
Fig. 7. Relative merit function versus piston error for an instant realization of DFP for an SNR of 1.
Fig. 8. Piston corresponding to the maximum of merit function versus different SNRs: (a) for uniform spectral profile, (b) for random spectral profile as in Fig. 4(b) .
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Table 1. Parameters Used for Analysis of J as a Function of Piston Error
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