3 results about "Phase shifting algorithm" patented technology

This invention discloses a stripe projection 3D imaging system based on a Micro-LED array. Its 3D information acquisition module consists of an integrated packaged Micro-LED driver board, a Micro-LED array, a micro-projection module, and a CCD camera. The 3D reconstruction module utilizes a computer. The micro-projection module is equipped with a plano-convex lens and a mechanical focusing damping structure, and is separately arranged in the front and rear optical paths of the Micro-LED array. The system's workflow is as follows: the driver board reads pre-stored stripe pattern data and timing-controls the Micro-LED array to output coded structured light stripes; the focusing structure adjusts the object distance in the optical path, focusing and scaling the stripes before projecting them onto the surface of the object being measured; the CCD camera simultaneously acquires a sequence of deformed images modulated by the object's shape and transmits it to the computer; the computer combines a multi-step phase-shifting algorithm and Gray code rules to complete phase calculation and unfolding, and, combined with a preset phase-height mapping relationship, reconstructs the 3D shape and point cloud data of the object being measured. This invention enables low-cost, miniaturized, and high-performance 3D shape measurement.

This invention relates to the field of fiber optic measurement technology, and particularly to a method and system for measuring and modulating temperature and stress in multimode fiber optics. The method utilizes a single-frequency laser emitted from a pigtail laser, which is then split by a beam splitter and fed into the multimode fiber of the measurement and reference arms. The outgoing light is collimated, polarized, and then combined by a polarization combining crystal. After being modulated by a quarter-wave plate, interference fringes are finally recorded by a polarization mask camera. A four-step phase-shifting algorithm is used to reconstruct the wavefront phase image, extracting two characteristic parameters: the change in the tilt angle of the interference fringes and the change in the wavefront phase distribution. This invention leverages the differences in wavefront response mechanisms of multimode fibers under temperature and stress to achieve two-parameter decoupling. It offers advantages such as high real-time performance, resistance to strong light interference, and a compact structure, making it suitable for integrated precision temperature and stress measurement in industrial monitoring and aerospace fields.

This invention discloses an embryo adaptive quantitative phase imaging system and method based on real-time phase shift feedback. The system includes an illumination module, an imaging module, and a quantitative phase imaging module arranged sequentially along the optical path. The Nomaski prism in the imaging module is equipped with a mechanical transmission device, enabling high-precision displacement along the shear direction. The quantitative phase imaging module measures the sample phase difference using a spatial light modulator and a four-step phase shift algorithm. Based on the measurement results, the system calculates the required prism displacement and dynamically adjusts the prism position to maintain the total system phase difference at an optimal state of π / 2. This invention solves the problem that traditional differential interferometry systems cannot adapt to dynamic changes in sample phase due to fixed prism positions, achieving real-time optimization of imaging contrast, and is particularly suitable for dynamic observation of embryonic development.