We describe and discuss the development of an optical fiber-based, distributed vibration sensor that utilizes two distinct spatial mode detection techniques to extend the overall dynamic range and detection capabilities of the system. The system employs a laser diode source, a multimode optical fiber sensor, and a CCD camera. The more sensitive detection technique is based on monitoring changes in the speckle pattern due to modal interference. The immediate goal is the development of "smart" bed technology to noninvasively monitor patient vital signs, motion and overall health in an eldercare setting. The research is focused on increased automation of patient care and documentation. Given the rapid aging of the world's population, such improvements in technology are required to maintain and improve patient care while decreasing both the cost and the workload of healthcare providers. Here, the optical fiber sensor will be integrated into the mattress of a bed for continuous, long term monitoring. The results indicate that the integrated sensor can detect patient vital signs such as respiration rate as well as patient movement. Results and analysis are presented and future research activities are discussed.
展开▼
