Fig. 1. Principle of Tolansky interference. (a) Principle optical path; (b) interference concentric rings

Fig. 2. Common-path interference instrument and experimental results. (a) Common-path interference optical path; (b) result of common-path interference optical path

Fig. 3. Interference diagram

Fig. 4. Dual-arm optical path Tolansky interference system. (a) System layout; (b) interference concentric rings

Fig. 5. Diagram of back-and-forth reflection

Fig. 6. Schematic diagram of multi-beam interference. (a) Interference from the first three back-and-forth reflection; (b) interference from the first N back-and-forth reflection

Fig. 7. Simulation result. (a) Simulated interferogram; (b) brightness variation curve

Fig. 8. Interference results under different transmittance and reflectivity for N=3. (a) Group 1; (b) group 2; (c) group 3

Fig. 9. Gray-scale variation curves of interference images under different transmittance and reflectivity. (a) Fig. 8(a) comparison result; (b) Fig. 8(c) comparison result

Fig. 10. Common-path Tolansky interference system

Fig. 11. Interference results under different transmittance and reflectivity. (a) Group 1; (b) group 2; (c) group 3