de Vries F R, van der Heijde G L, Goovaerts H G
J Biomed Eng. 1987 Jan;9(1):32-7. doi: 10.1016/0141-5425(87)90097-5.
We describe a new system for accurate measurement of intraocular distances; it is used in conjunction with standard A-scan ultrasound equipment. A processing unit has been developed which enables selection of time intervals between echoes. Up to four intervals can be chosen and simultaneously measured. The output of the system is derived from a pulse duration-to-voltage converter which presents an output voltage proportional to the selected time interval. In this way variations in intraocular distances larger than about 0.01 mm can be detected.
我们描述了一种用于精确测量眼内距离的新系统；它与标准A超超声设备结合使用。已开发出一种处理单元，可用于选择回波之间的时间间隔。最多可选择并同时测量四个时间间隔。该系统的输出源自脉冲持续时间-电压转换器，其输出电压与所选时间间隔成正比。通过这种方式，可以检测到大于约0.01毫米的眼内距离变化。
