Range-selective FMCW digital holography for imaging through scattering environments

Corey A. Pearson; Matthew Goodman; R. Krishna Mohan; Wm. Randall Babbitt

doi:10.1117/12.3001945

13 March 2024 Range-selective FMCW digital holography for imaging through scattering environments

Corey A. Pearson, Matthew Goodman, R. Krishna Mohan, Wm. Randall Babbitt

Proceedings Volume 12910, Practical Holography XXXVIII: Displays, Materials, and Applications; 1291009 (2024) https://doi.org/10.1117/12.3001945
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

The use of a frequency modulated continuous wave (FMCW) coherent source for both the illumination and reference beam enables range-selective digital holographic imaging. When the frequency of the reference beam is shifted by the FMCW beat frequency associated with an object at a particular range, only the light scattered from objects at that selected range forms a temporally stable interference pattern on the sensor. Thus, only objects at the selected range are present in the reconstructed image. Interference patterns from light scattered from objects outside the selected range integrate towards zero. This enables the removal of foreground scattered light from particles (for example, dense fog) that obstructs the object of interest and reduces contrast. To demonstrate this, a four-meter-tall range-extending tower with mirrors at the top and base (which create multiple reflections, and multiple passes through the tower), is used to achieve beam path lengths up to 50 meters on the optical bench. Scattering plates in the tower are used to emulate volumetric Mie scattering, analogous to dense fog. The holographic images are recorded using an off-axis digital holography setup that operates at 1550 nanometers. We demonstrate range-selective digital holographic imaging of objects up to 24 meters with range selectivity much shorter than the optical system’s depth of field.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Corey A. Pearson, Matthew Goodman, R. Krishna Mohan, and Wm. Randall Babbitt "Range-selective FMCW digital holography for imaging through scattering environments", Proc. SPIE 12910, Practical Holography XXXVIII: Displays, Materials, and Applications, 1291009 (13 March 2024); https://doi.org/10.1117/12.3001945

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