Martin Brenden, Islam Md Zobaer, Gotcher Carly, Martinez Tyler, Ekin Sabit, O'Hara John F
School of Electrical and Computer Engineering, 200 Engineering South, Oklahoma State University, Stillwater, OK 74078, USA.
Department of Engineering Technology & Industrial Distribution, Texas A&M University College of Engineering, 3127 TAMU, College Station, TX 77843-3127, USA.
Biomed Opt Express. 2024 Oct 21;15(11):6449-6468. doi: 10.1364/BOE.514776. eCollection 2024 Nov 1.
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.
构建了一个实验测试平台，以严格评估光波传感的基本极限——这是一种先前报道的经济、非接触式生命体征监测方法。我们使用锁相放大对测试平台进行了改进，并证明一个光电探测器和一组普通的红外发光二极管足以检测呼吸运动并在2.5米外量化呼吸频率。我们提出了一种新颖的散射模型，据此得出了光波传感系统在受系统动态范围限制的理论距离分辨率方面的性能极限。我们使用一个机器人呼吸模型首次通过实验评估了测试平台系统的距离分辨率，并将其与理论预测进行比较。这项工作还介绍了一种生成随机呼吸模式的方法，这可能对呼吸模型的设计者具有广泛的用途。通过全面探讨实际挑战和分析模型，本文为理解和设计光波传感系统提供了一个独特而全面的指南。
