摘要
针对传统光照功率计采用积分法测量功率引起的高误差,从应用角度出发,提出一种MSP430为主控制器的高精度光照功率计。光电传感器将光信号转换为毫安级电流信号,经过负反馈电流放大转换电路,再通过差分放大和滤波电路,经过24位高精度AD模数转换芯片将模拟信号转为数字信号,再融合递推和中位值数字滤波算法,计算得到光照功率。通过LCD实时显示测量值,并经过Savitzky-Golay滤波器后显示随时间变化的测量曲线。实验证明,所设计的光照功率计误差低于0.3%,具有功耗低、系统稳定、显示界面友好的优点,可以存储测量数据,显示光功率曲线。
Aiming at the high error caused by the integral method for the traditional optical power meter,from the application point of view,a high-precision optical power meter with MSP430 is proposed.The photoelectric sensor converts the light signal into mA current signal,through a negative feedback current amplification,and then through a differential amplification and filtering circuit,and converts anolog signal into a digital signal through a 24-bit high-precision AD chip.The optical power is calculated using recursive and median digital filter.The measured value is displayed on the LCD.The optical power curve is also displayed after through the Savitzky-Golay filter in measurement phase.The experiment proves that the optical power meter has an error of less than 0.3%,low power consumption,stable system,friendly display interface,it can store measurement data and display optical power curve.
作者
王磊
朱可
王军
何昕
WANG Lei;ZHU Ke;WANG Jun;HE Xin(Suzhou University of Science and Technology, Suzhou 215009, China;Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun 130033, China)
出处
《液晶与显示》
CAS
CSCD
北大核心
2020年第6期531-536,共6页
Chinese Journal of Liquid Crystals and Displays
关键词
低功耗
24位高精度
数字滤波
功率曲线
low power consumption
24-bit high-precision
digital filter
power curve
