Fig. 1. Principle diagram of Mach-Zehnder-based spatial-phase-shift double-imaging system with large field of view

Fig. 2. Principle diagram of introduction of spatial carrier frequency

Fig. 3. Picture of object to be measured. (a) Defect-free and thimble-loaded object; (b) defect-built-in and air-pressure-loaded object

Fig. 4. Light path diagram of Mach-Zehnder-based spatial-phase-shift double-imaging system with large field of view

Fig. 5. Fourier transform result of speckle interference pattern obtained by camera

Fig. 6. Phase distribution maps of object after deformation. (a) Defect-free and thimble-loaded object; (b) defect-built-in and air-pressure-loaded object

Fig. 7. Measurement results of proposed system using imaging lens with different focal lengths and traditional Mach-Zehnder-based spatial-phase-shift double-imaging system. (a) Proposed system including imaging lens with 35 mm focal length; (b) proposed system including imaging lens with 50 mm focal length; (c) traditional Mach-Zehnder-based spatial-phase-shift double-imaging system