摘要
针对照明光源普遍存在的闪烁现象,提出了一种基于频谱分析的闪烁评价方法。把时变光信号进行傅里叶变换得到其频域内的功率谱,并通过与人眼视觉对比敏感度相匹配的带通滤波器进行滤波,最后经傅里叶逆变换得到调制后的瞬态光信号波形,据此定义闪烁度来定量表征闪烁程度的大小。对几种典型的光源进行检测并计算其闪烁度,结果与已有实验结论相吻合。该方法结合视觉敏感特性对现有评价方法进行了改进,实现了对光源闪烁的客观度量,给照明优化设计和照明行业标准建立提供了有效借鉴。
An objective characterization method for lighting flicker based on frequency spectrum analysis is proposed. Time-varying light signals were Fourier transformed into frequency domain, filtered by bandpass filter that matched Contrast Sensitivity Function （CSF）, and applied inverse Fourier transform into time domain again. Based on the modulated transient light waveform, Flicker Degree （FD） was defined as a measure of lighting flicker. Several kinds of typical illuminants were tested and their FDs were calculated. Results agreed well with previous experiment and showed more stable repeatability. The method combined with human visual system provides an objective evaluation for lighting flicker, and gives a hand with lighting optimization design and industrial standardization.
出处
《光电工程》
CAS
CSCD
北大核心
2012年第11期32-36,共5页
Opto-Electronic Engineering
基金
国家科技支撑计划-半导体照明应用系统技术集成与示范
关键词
频谱分析
傅里叶变换
视觉对比敏感
闪烁度
frequency spectrum analysis
Fourier transform
contrast sensitivity function
flicker degree
