非接触眼压计光电信号放大检测电路设计  

Design of Photoelectric Signal Amplification Detection Circuit for Non-contact Tonometer

作　　者：张冬冬 王劲松[1] 李一 肖作江[1] ZHANG Dong-dong;WANG Jin-song;LI Yi;XIAO Zuo-jiang(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022)

机构地区：[1]长春理工大学光电工程学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2020年第2期74-80,共7页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：吉林省重点科技研发项目(20180201025GX)。

摘　　要：非接触眼压检测是通过将压平的物理量信号转变为电信号从而得出最终的眼压,但检测出的信号一般都比较微弱。针对微弱且富含噪声干扰的信号设计出了一个一级降噪放大电路。将最基础的跨阻运放电路进行改进,在反馈回路采用反馈电阻和反馈电容并联的方式可以在低频段产生高通截至点来抑制直流电压失调和相关噪声。并且在非反相端使用RC分压电路来抑制电阻分压器和电源产生的噪声。通过对电路的分析和详细的参数计算得出一个完整的前置放大电路,并分别对电路做了相关的噪声和仿真分析,最终取得了一个稳定且无系统振铃的信号。Non-contact intraocular pressure(IOP) detection is to obtain the final IOP by converting the physical signal of the flattening into electrical signal;however,the detected signal is generally weak. A first-order noise reduction amplifier circuit is designed for weak and noisy signals. The most basic transconductance discharge circuit is improved. The feedback circuit can produce high-pass cut-off point in low frequency band by parallel connection of feedback resistor and feedback capacitor to suppress DC voltage offset and related noise. RC voltage divider circuit is used to suppress the noise produced by resistor voltage divider and power supply at the non-inverted end. Through the analysis of the circuit and detailed parameter calculation,a complete preamplifier circuit is obtained;and the related noise and simulation analysis of the circuit are made respectively. Finally,a stable signal without system ringing is obtained.

关 键 词：非接触眼压计 光电检测 电路设计 前置放大 

分 类 号：TP368[自动化与计算机技术—计算机系统结构]