Two beams two orthogonal views particle detection

Abstract

This paper presents a new technique for recording the two views off-axis digital holography using only two beams, each one acting as an object beam for its proper view and as a reference for the other view. This technique allows one to obtain two orthogonal views of the same volume simultaneously using only two beams. This leads one to avoid the large focusing distance inherent to off-axis digital holography and gives the real position of any object in the working volume by crossing the two view data. Furthermore, the lateral resolution should be the same as the vertical one. The proposed technique was improved experimentally using a metallic wire in an L shape and four moving particles.

Quantitative phase imaging based on holography: trends and new perspectives

“…It can be applied to perform 3D shape measurements, followed by phase unwrapping with multiple illumination angles 176 – 178 . Multiplexing from multiple viewpoints can be used to improve the 3D position measurements, which are typically carried out for particle tracking 179 – 181 . By using an SLM, several focal planes of object wave are employed for sharp multiplexing in single camera acquisition 182 , as shown in Fig.…”

In-Line and Off-Axis Hybrid Digital Holographic Imaging Method Based on Off-Axis Hologram Constraints

“…DH ofers several advantages, including high precision and digital focus without the need of contact with the object. Currently, DH is widely used in microscopic imaging [2][3][4], 3-D measurement [5][6][7], particle tracing, and sizing [8][9][10].…”

“…We can use an additional iterative process summarized below to suppress or attenuate the efect of reference wave errors. (10) An averaging flter G may be selected to suppress the carrier frequency component into the solution.…”