Brown A W
J Biomed Eng. 1981 Oct;3(4):275-80. doi: 10.1016/0141-5425(81)90131-x.
A system has been devised, using a spark-gap ultrasonic transmitter and an array of four ultrasonic receivers, to monitor the unrestrained movement of a physically handicapped child's fingertip as he attempts to perform some specific task. A microprocessor is used to measure the time taken for a pulsed ultrasonic shock-wave to travel from the fingertip-mounted spark-transmitter to each of the four ultrasonic receivers, and hence compute the Cartesian co-ordinates of the transmitter. It is hoped that this equipment will enable the voluntary components in the poorly-controlled limb movements of some of the physically handicapped children to be isolated and used to control external equipment.
已经设计出一种系统，该系统使用火花隙超声波发射器和由四个超声波接收器组成的阵列，来监测一名身体有残疾的儿童在尝试执行某项特定任务时其指尖的自由运动。微处理器用于测量脉冲超声波冲击波从安装在指尖的火花发射器传播到四个超声波接收器中每一个所需的时间，从而计算出发射器的笛卡尔坐标。希望该设备能够分离出一些身体有残疾儿童控制不佳的肢体运动中的自主成分，并用于控制外部设备。
