A Wavefront Reconstruction Device and Method Based on Extended Rotational Symmetry Structured Lighting Illumination

Abstract

The invention discloses a wavefront reconstruction device and method based on extended rotational symmetry structured light illumination. The device includes sequentially arranged lasers, attenuation mirrors, microscopic objective lenses, pinholes, collimating lenses, beam splitting prisms, spatial light modulators, A lens to be tested and an image acquisition device. This method uses the spatial light modulator to modulate the incident parallel light into phase grating-like structured light. By changing the modulation pattern of the spatial light modulator and using the characteristic that the pixel unit of the spatial light modulator is not infinitely small, it can generate different Structured light, by collecting diffraction spots on the focal plane, using algorithms to update the target surface and structured light surface at the same time, not only restores the target to be measured, but also restores the real structured light wavefront, overcoming the problem caused by the inaccurate knowledge of structured light information recovery error. This method can achieve high-steep wavefront phase recovery without moving the image acquisition device, and avoids the rotation error caused by traditional rotating illumination by introducing a spatial light modulator.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a wavefront reconstruction device and method based on extended rotationally symmetrical structured light illumination. Background technique [0002] Computational imaging is widely used to improve imaging quality, simplify imaging systems, break through the physical limitations of optical systems and image acquisition equipment to achieve super-resolution, etc. As a way to realize computational light field imaging, phase recovery has been widely used since it was proposed in the 1970s due to its stable and reliable convergence effect. In the 1990s, the University of Rochester in the United States successfully applied the phase recovery method to the aberration correction of the Hubble Telescope. The traditional iterative phase recovery method is based on Fourier transform and inverse Fourier transform, iteratively iterates between the space domain and the Fourier dom...

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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the prior art and provide a wavefront reconstruction device and method based on extended rotationally symmetric structured light illumination to solve the problem that the traditional iterative phase recovery method falls into a local optimal solution, while overcoming the traditional diffraction The error introduced in the modulation process of the optical element avoids the movement error by using the spatial light modulator to generate structured light

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