名师学术报告

报告题目： 生物灵感启发的人体修复用运动传感器

Bioinspired Motion Sensors for Vestibular Prosthesis

主讲人：赵毅 博士

时间： 2009年12月22日下午 2：00

地点：理化楼401

主办：应用科学学院

参加人：物理和材料物理专业本科生

报告内容：

In this talk, I will introduce the pioneer work of using liquid state inertial sensors for vestibular prosthesis. More than 6.2 million Americans report experiencing chronic problems with dizziness or balance, which demonstrates a necessity of balance prosthesis. An implantable or wearable prosthesis requires a device integrating miniaturized motion sensors, signal processors and stimulating electrodes on a single chip for detecting the body motion, converting the motion parameters to physiological meaningful signals and transferring the signals to peripheral and central nervous systems. The central component of the prosthesis is the motion sensor, which should have identical or similar functions as natural vestibular system in the inner ear for detecting motion with relatively low frequencies. Here, I will elaborate our ongoing research on developing liquid state bio-inspired inertial sensor for motion detection. The strength and limitation of liquid state motion sensing will be discussed in comparison with solid-state counterparts. The design and implementation of the motion sensor prototype using a liquid marble as the proof mass will also be described.

I will also introduce other ongoing research activities in Laboratory for Biomedical Microsystems for developing enabling technologies for point-of-care diagnostic tools, and graduate program of Department of Biomedical Engineering at the Ohio State University .

报告人简介：

There long has been a practice of determining motion parameters using a solid-state MEMS sensor (i.e., accelerometer or gyroscope) that has high precision, low cost and small size. In such a sensor, motion change induces change of mechanical strain, displacement, or resonant frequency shift of the solid-state proof mass. A piezoresistive, piezoelectric or capacitive sensing component converts such change into electrical signals that can be recognized and processed. Although effective, solid-state motion sensors are limited to a certain extent by complex fabrication and packaging processes. Since the sensing performance is highly sensitive to fabrication imperfection, tools for fabricating, characterizing and calibrating these free-standing structures must have high precision. Moreover, extraordinary attention is paid in the packaging process, not only to reduce damping effects but also to protect the mechanically fragile, free-standing structures. In addition, the sensitivity and the measurement range of a solid-state motion sensor often are intrinsically coupled, which makes it difficult to develop a sensor with a very high-level of sensitivity and a large measurement range, simultaneously.