视觉刺激同步仪的研制  

Development of Visual Stimulation Synchronizer

作　　者：许晨晨 吴伟[1] 江旭 李博 梁振[1] XU Chenchen;WU Wei;JIANG Xu;LI Bo;LIANG Zhen(School of Biomedical Engineering,Anhui Medical University,Hefei Anhui 230032,China)

机构地区：[1]安徽医科大学生物医学工程学院,安徽合肥230032

出　　处：《中国医疗设备》2022年第11期12-16,共5页China Medical Devices

基　　金：国家自然科学基金(31400943);安徽高校自然科学研究项目(KJ2020ZD16);安徽省转化医学研究院科研基金项目(2017zhyx28)。

摘　　要：目的研制一种用于同步视觉刺激与响应采集设备的同步仪,以降低串口延时带来的测量误差。方法利用光敏三极管采集视觉刺激的光信号,将其转换为电信号后经过微处理器输出TTL、RS232电平,输出接口与采集设备连接。结果利用逻辑分析仪采集计算机串口输出信号与显示器呈现光信号的时间差,经处理后计算约为5 ms,而同步仪输出的信号和显示器呈现的光信号的时间差可以稳定在1 ms以内。结论该同步仪可以提供1 ms的时序同步精度,提高视觉刺激实验的准确性,为视觉科学、脑科学等学科实验提供帮助。Objective To develop a synchronizer for synchronizing visual stimulus and response acquisition devices to reduce the measurement error caused by serial port delay.Methods The phototriode(PT908)was used to collect optical signal of visual stimulation,which was converted into electrical signal and output TTL,RS232 levels through microprocessor.The output interface was connected with the acquisition device.Results The time difference between the output signal of the computer serial port and the light signal presented by the monitor was collected using a logic analyzer and calculated to be about 5 ms after processing,while the time difference between the output signal of the synchronizer and the light signal presented by the monitor could be stabilized within 1 ms.Conclusion The synchronizer can provide 1 ms timing synchronization accuracy to improve the accuracy of visual stimulation experiments,and provide help for the experiments of visual science,brain science and other disciplines.

关 键 词：视觉刺激 串口延时 光敏三极管 同步仪 

分 类 号：R197.39[医药卫生—卫生事业管理] R318.6[医药卫生—公共卫生与预防医学]