针对某型号手机带手电筒闪光的特点,设计了一种光源闪动频率测试系统。利用小面积PIN光电二极管对光源闪动的信息进行捕捉,设计了光电转换电路对光信号进行识别和转换,采用滞回比较器对信号进行整形。通过对手电筒30 Hz闪动模式实际测量表明:该系统性能可靠且测量精度高,有一定的实用价值。

A testing system for light flashing frequency was designed for flashlight shining features of some mobile phones. Small area PIN photodiode was used to catch light flashing message; photoelectric conversion circuit was designed to recognize and convert the optical signal; hysteretic comparator was to shape the signal. By actually measuring 30 Hz flashing mode of flashlight, the results showed that the system had characteristics of reliability and high accuracy and had some practical values.