Dynamic phase measurement of a transparent object by parallel phase-shifting digital holography with dual polarization imaging cameras

Measurement of surface shape and refractive index for moving transparent objects is critical in various fields. A parallel phase-shifting digital holography system that can record and reconstruct the phase information of moving transparent objects using two high-resolution polarization imaging cameras was presented. In the developed system, two polarization imaging cameras with 3.45 mu m pixel pitch passed through the object in different directions. These two polarization imaging cameras were controlled by LabVIEW and worked synchronously. The proposed system can obtain the object's integral phase distributions in different directions, which is more effective for measuring an asymmetric object. In the experiment, the resolution of the system was confirmed by using a transmission-type test target. Besides, the dynamic phase measurement of an irregularly shaped transparent object was completed to verify the proposed system's effectiveness.

Automated summary

A parallel phase-shifting digital holography system was developed to measure the surface shape and refractive index of moving transparent objects, utilizing two high-resolution polarization imaging cameras to record and reconstruct phase information. The system was effective in measuring asymmetric objects and accurately capturing the dynamic phase of irregularly shaped transparent objects.