Phase stitching and error correction in aperture synthesis for generalized phase-shifting interferometry

Abstract

An accurate aperture synthesis method in generalized phase-shifting interferometry is suggested to improve the quality of the reconstructed object wavefront by stitching both the phase and the real amplitude of the object wave on the recording plane. Since the phase distribution affects the reconstruction of the original object wavefront, phase stitching is also important in aperture synthesis. Double correlations are used to find the proper relative locations and correct the phase error of subwavefronts on the recording plane. By using phase correction, the phase distributions of subwavefronts are combined perfectly. Corresponding optical experimental results have verified the effectiveness of this method, which can stitch not only the real amplitudes but also the phases of the complex amplitudes of the object wave on the recording plane and improve the quality of the reconstructed object image.

THz holography in reflection using a high resolution microbolometer array

“…To overcome the limitations of digital holographic resolution due to the detector size the use of object rotation [15], several detectors [16] or the use of a single detector in different positions has been reported [17]. These synthetic aperture approaches cover a larger frequency spectrum and thus improve resolution as is known from combining multiple off-axis holograms [18].…”

Theory and algorithms of an efficient fringe analysis technology for automatic measurement applications

“…In general, as a result, a fringe pattern (structured intensity map) is obtained at the output. For this reason, it is necessary to develop an efficient fringe analysis technology in order to extract the encoded physical information of interest [5,13,14].…”

Further investigation on the phase stitching and system errors in digital holography

“…Thus, the testing area of DH can be enlarged by this technology. Later, a further experiment was done in [15,16] to verify the performance of the phase stitching technique. However, the existing phase stitching method used in DH only includes tilt and shift terms, which is not robust in practical measurements.…”