摘要目的 设计一种高精度的医用激光功率密度计,用于测量激光在临床医学上的功率密度,以便更好地将激光应用于临床.方法 采用热释电探测器将激光信号转换为可处理的电信号,设计与探测器相匹配的前级放大滤波电路及控制显示电路;采用C语言进行软件编程,软硬件相结合,研制一种基于AVR单片机控制的高精度医用激光功率密度计.结果 功率密度计可测量的最小功率密度为1 mW/cm2,误差为2％,可满足临床上医用激光功率密度测量的参数要求.结论 功率密度计精度高、误差小、稳定性好,能够精确测量激光功率密度大小.

abstractsObjective To research and design a kind of high accuracy laser power density meter to measure laser power density in clinical medicine,in order to combine laser with clinical medicine well.Methods The pyroelectric detector was used to convert the laser signal to available electrical signal,preamplifier filter circuit and control circuit were designed to match the detector,and C was used for software programming.With the combination of hardware and software design,a high precision laser power density meter was developed,which was based on AVR microcontroller.Results The instrument could measure the minimum 1 mW/cm2 of laser power density accurately and the error rate was 2％,which met the requirements of the laser power density meter parameters in medical application.Conclusion The power density meter has a high precision,small error rate and good stability,and it can measure the laser power density accurately.