Work

Fundamental limits of light-wave sensing for non-contact respiration monitoring

Year: 2024

Type: article

Abstract: An experimental testbed was constructed to rigorously assess the fundamental limits of light-wave sensing-an economic, non-contact vitals monitoring approach previously reported. We improve the testbed using lock-in amplification and demonstrate that a photodetector and a commonplace array of infrared LEDs are sufficient to detect respiratory motion and quantify respiration rate up to 2.5 meters away. We propose a novel scattering model, from which we derive the performance limits of the light-wave sensing system in terms of a theoretical range resolution limited by the dynamic range of the system. Using a robotic breathing phantom, we experimentally assess, for the first time, the range resolution of the testbed system and compare this to theoretical predictions. This work also introduces a process for generating stochastic respiration patterns, which may prove broadly useful to the designers of breathing phantoms. Holistically exploring practical challenges and analytical models, this paper serves as a unique and comprehensive tutorial for understanding and designing light-wave sensing systems.

Source: Biomedical Optics Express

DOI: 10.1364/boe.514776

Authors: Brenden Martin, Md Zobaer Islam, Carly Gotcher, Tyler Martinez, Sabit Ekin, John F. O’Hara

Institutions: Oklahoma State University, Texas A&M University

Language: English

Topic: Non-Invasive Vital Sign Monitoring

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,913

Funder: National Science Foundation