Fig. 1. Schematic diagram of Moiré fringe formation

Fig. 2. Flow chart of principle for torsion angle measurement system

Fig. 3. Schematic diagram of Moiré fringe torsion angle measurement system

Fig. 4. Physical drawing of experimental apparatus

Fig. 5. Collected images of Moiré fringe from different angles

Fig. 6. Diagram of time domain and frequency domain for single-line interference signal

Fig. 7. Comparison of results with or without spectral correction

Fig. 8. Experimental measurement results

Fig. 9. Collected images of 10° and 170°