Weinberg G M, Webster J G
Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 53706, USA.
Physiol Meas. 1998 Aug;19(3):441-6. doi: 10.1088/0967-3334/19/3/013.
We have designed, built and tested a proof-of-concept system based on optical encoder technology for measuring adult or infant ventilation. It uses change in chest circumference to provide an indirect measure of ventilation. The Hewlett-Packard HEDS-9720 optical encoder senses displacement of its matching codestrip. It yields a resolution of 0.17 mm and is accurate to 0.008 mm over a 10 mm test distance. The encoder is mounted on a nylon web belt wrapped around the torso and responds to changes in circumference. Motion of the code strip during respiration is converted to direction of movement (inhalation or exhalation) as well as magnitude of circumference change. Use of two sensor bands, one on the chest and one on the abdomen, may allow detection of obstructive apnoea in which there is no air flow out of or into the subject despite respiratory movement. Applications of this technology include infant apnoea monitoring as well as long-term adult monitoring.
我们设计、构建并测试了一个基于光学编码器技术的概念验证系统，用于测量成人或婴儿的通气情况。它利用胸围的变化来间接测量通气。惠普HEDS-9720光学编码器可感应其匹配码带的位移。在10毫米的测试距离内，其分辨率为0.17毫米，精度为0.008毫米。编码器安装在环绕躯干的尼龙网带上，对周长变化做出响应。呼吸过程中码带的运动被转换为运动方向（吸气或呼气）以及周长变化的幅度。使用两个传感器带，一个在胸部，一个在腹部，可能有助于检测阻塞性呼吸暂停，即尽管有呼吸运动，但受试者没有空气进出。这项技术的应用包括婴儿呼吸暂停监测以及成人的长期监测。
