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Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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Electronic frequency shifting enables long, variable working distance optical coherence tomography.

Anna M Wisniowiecki1,2, Brian E Applegate2,3

  • 1Department of Biomedical Engineering, Texas A&M University, 101 Bizzell St, College Station, TX 77843, USA.

Biomedical Optics Express
|February 29, 2024
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This summary is machine-generated.

We developed a new optical coherence tomography (OCT) method using electronic frequency shifting to significantly extend imaging range beyond 21 cm. This breakthrough enables high-resolution imaging in dynamic environments without high-speed digitization.

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Area of Science:

  • Biomedical Optics
  • Optical Engineering
  • Medical Imaging Technology

Background:

  • Extended imaging range in Optical Coherence Tomography (OCT) is crucial for applications with large or remotely located samples.
  • Current OCT systems face challenges in achieving extended imaging ranges due to the direct relationship between range and required acquisition bandwidth.
  • Dynamic environments and sample topography often limit the practical utility of conventional OCT systems.

Purpose of the Study:

  • To develop a novel and flexible method for extending the imaging range of OCT systems.
  • To enable high-contrast, high-resolution OCT imaging over centimeter-scale working distances.
  • To facilitate OCT imaging in dynamic environments and overcome limitations of sample location and topography.

Main Methods:

  • Utilized a laser with a quasi-linear sweep to limit interferometric bandwidth, decoupling imaging range from acquisition bandwidth.
  • Incorporated a tunable lens for dynamic refocusing within the sample arm.
  • Implemented electronic frequency shifting to eliminate the need for high-frequency digitization.

Main Results:

  • Demonstrated high-contrast morphological imaging over a working distance range exceeding 21 cm.
  • Maintained high resolution and phase sensitivity across the extended imaging range.
  • Showcased system flexibility with simple post-processing phase correction.

Conclusions:

  • The developed electronic frequency shifting method effectively extends OCT imaging range without compromising image quality.
  • The system's flexibility and auto-focusing capability show strong potential for translating OCT into applications requiring variable, centimeter-scale imaging.
  • This approach overcomes key limitations, paving the way for broader OCT adoption in challenging environments.