反射增强的可穿戴环型脉冲氧计用于SpO2测量,具有高灵敏度和低功耗
Min Gyu Joo1, Dae Hyeong Lim2,3, Kyu-Kwan Park1
1Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Biosensors
|July 28, 2023
概括
一种具有镜子涂层内部的新型环型脉冲氧计设计显著提高了SpO2检测灵敏度,并降低了功耗. 这种反思促进的方法提高了长期健康监测的设备性能.
科学领域:
- 生物医学工程 生物医学工程
- 光学传感传感器是什么?
- 医疗器械设计 医疗器械设计
背景情况:
- 环型脉冲氧计 (RPO) 对SpO2监测至关重要,但它们的灵敏度和功耗严重取决于光电探测器 (PD) 和发光二极管 (LED) 的几何布局.
- 优化PD和LED的空间配置是提高睡眠和健康状况监控等应用程序的RPO性能的关键.
研究的目的:
- 用蒙特卡洛模拟来确定PD和LED之间的最佳角距离,以准确检测SPO2.
- 提出并验证反射增强的RPO设计,以提高灵敏度和降低功耗.
主要方法:
- 使用3D蒙特卡洛模拟来建模手指组织并计算光子强度,指导PD-LED几何学的优化.
- 环型脉冲氧计是为实验验证而制造的,有或没有高反射涂层.
- 在8名参与者中测量了包括信号与噪声比 (SNR),R比和 perfusion index (PI) 在内的性能指标.
主要成果:
- 与非反射设计相比,反射增强的RPO设计显著增加了检测到的光强度 (高达375%) 和PI (高达25.5%).
- 功耗降低了多达65%,只需要30-36%的功率才能达到可比性能.
- 模拟结果与实验测量结果有很强的一致性.
结论:
- 拟议的反射增强的RPO设计为高灵敏度,低功耗的SpO2测量提供了可行的解决方案.
- 这种增强的RPO设计使得可靠的长期健康监测能够提高设备效率和用户舒适度.
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