摘要
眼角膜厚度和眼压是眼球的两个重要生理参量,是诊断屈光不正、青光眼等眼科疾病的重要指标。新型复合传感器能一次性完成两个参量的测量。使用这种传感器,可以提高眼科医学诊断的便利性,同时可以根据角膜厚度修正眼压值。通过超声传感器和使用电磁驱动的压力控制系统相结合,实现两种测量的同步完成。超声传感器采用PZT系列压电复合材料,角膜厚度采用超声波脉冲回波法测量。电磁压力控制根据眼压测量的需求,通过计算得到电磁驱动系统的结构参数和电磁参数。由实验测量结果可知,角膜厚度测量精度在±10μm范围内;电磁压力控制系统的压力范围为0~0.490 N,精度为0.000 6 N。该复合传感器测量精度和范围符合传统角膜测厚和眼压计的标准,为二合一眼科仪器研制打下基础。
Corneal thickness and intraocular pressure（ IOP） are both the significant physiological parameters of the eyeball,and have great influence on the diagnosis of refractive errors,glaucoma and other eye diseases. The new kind of composite sensor could achieve a simultaneous measurement of the two parameters. The use of this sensor,on the one hand could improve the convenience of ophthalmic diagnosis,on the other hand could correct IOP based on corneal thickness. To complete the two measurements synchronously,the ultrasonic sensor and the electromagnetic-driven pressure control system were combined. Ultrasonic sensor used piezoelectric composite materials,and corneal thickness was measured with the high frequency ultrasonic pulse-echo. The structural and electromagnetic control parameters in the electromagnetic drive system were got by electromagnetic functions,the electromagnetic force was controlled according to the actual needs of IOP measuring. The experimental results showed that the accuracy of corneal thickness measurement was within ± 10 μm; in the electromagnetic pressure control system,the pressure range was 0 ~ 0.490 N,the accuracy 0.000 6 N. The accuracy and range of the composite sensor were in line with the standard of traditional corneal thickness measurement and tonometer. This study laid the foundation for the further development of two-in-one measuring ophthalmic instruments.
作者
夏翎
赵兴群
XIA Ling, ZHAO Xingqun(School of Biological Science and Medical Engineering,Southeast University,Nanjing 210096, Chin)
出处
《传感技术学报》
CAS
CSCD
北大核心
2017年第12期1794-1799,共6页
Chinese Journal of Sensors and Actuators
关键词
医用传感器
眼角膜测厚
眼压测量
电磁压力控制
medical sensor
corneal thickness measurement
intraocular pressure measurement
electromagneticpressure control
作者简介
夏翎（1963-），男，浙江诸暨人，东南大学助理工程师。主要从事医学仪器设计和开发、模拟及数字电路设计、超声信号在医学及工业上的应用研究，xiMing@seu．edu．cn;赵兴群（1964-）男江苏泰州市博士现任东南大学教授，主要从事医学仪器设计和开发、医学信号分析与处理、超声波检测技术及应用等研究，ndt@seu．edu．cn
