瞳孔控制系统的动态特性测量与数学模型
Dynamic Characteristics of the Pupillary Control System:Measurement and Mathematical model
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摘要: 瞳孔对光反应可以看成是一个反馈控制过程,它自动调节投射到视网膜上的光量,对这个较简单的生物闭环系统的研究,有利于进一步探讨各种更复杂的生物控制系统. 本文是应用专用的红外线电视设备,以不同波形的可见光脉冲作为输入信号,对瞳孔控制系统的反应即瞳孔面积的变化进行了多次测量.实验结果表明系统的动态特性是非线性的, 它具有正微商检测器特性.且可用一个三阶微分方程来模拟瞳孔控制系统的动态过程,并对此作了初步讨论.Abstract: The pupil reflex to light may be treated as a feedback process to control the light impinging upon the retina. By means of an infrared TV equipment, the pupil area changes were measured as system response to the input of light pulses with various waveforms. The results showed that the dynamic characteristics of pupillary system is quite nonlinear, the pupil system behaves like a positive differential detector. A third order differential equation can be formulated to simulate this dynamic characteristic. The meaning of the model was discussed briefly.
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