Orthographic double-beam holographic interferometry for limited-view optical tomography

Area of Science:

• Optical physics
• Tomography
• Heat transfer

Background:

• Limited-view optical tomography presents challenges in reconstructing complex refractive-index fields.
• Accurate temperature distribution mapping is crucial in various scientific and engineering applications.

Purpose of the Study:

• To present and numerically simulate a simultaneous algebraic reconstruction technique (SART) for limited-view optical tomography.
• To investigate the reconstruction accuracy and speed of SART under limited view conditions.
• To experimentally validate the SART method using a novel holographic interferometry system.

Main Methods:

• Numerical simulation of SART for three-dimensional asymmetric refractive-index field reconstruction.
• Development of a new orthographic double-beam holographic-interferometric system for multidirectional data acquisition.
• Experimental investigation of an asymmetric heat air-flow field using double-exposure holographic interferometry.

Main Results:

• SART demonstrated adequate reconstruction speed and accuracy within two orthographic-view directions and limited view ranges.
• The novel holographic interferometry system successfully acquired multidirectional interferometric data.
• Reconstructed temperatures using SART showed consistency with thermocouple measurements.

Conclusions:

• The simultaneous algebraic reconstruction technique (SART) is effective for limited-view optical tomography.
• The developed orthographic double-beam holographic-interferometric system provides a viable platform for experimental validation.
• SART offers a reliable method for reconstructing temperature distributions in asymmetric heat air-flow fields.