基于误差反馈的LED阵列近场光强检测

发光二极管(LED)在机场、铁路等领域作为信号光源,通常采用多个LED组成阵列的方式。传统方法为拆卸后送入实验室中进行检测,此时无法获得光源在工作现场的状态且使得整个检测周期较长,针对上述问题提出一种基于照度误差的方法。在现场的近场区域内移动照度探头采集照度数据;再对各LED预设光强分布,计算此光强分布下在各测量点形成的照度与利用照度探头实际测量得到的照度的误差并根据此误差来更新设置的光强值,多次迭代至误差足够小;最后将此时计算得到的每个LED的近似光强分布进行叠加用于计算整个LED阵列的光强分布。通过该方法可以在现场快速准确检测灯具光强分布的同时,保障整个检测系统的设计能够便携。通过实验验证,所提方法在不同情况下能够完成光强检测,匹配度达到93%以上。

Near-field Intensity Detection of LED Array Based on Error Feedback

Light emitting diode (LED), which acts as a signal light source in fields such as airports and railways,usually uses the way of arrays of LEDs. The traditional method is to send the light source to the laboratory for detection after disassembly. In this way, the state of the light source at the work site cannot be obtained and the whole detection period is a little long. A method based on illumination error is proposed to solve the above problems. First, in the scene where the lamp is not disassembled or moved, the illumination distribution was detected by moving the illumination probe in the near-field area. Second, presetting the light intensity distribution of each LED. Third, calculating the error between the illuminationwhich was formed at the measuring point under this light intensity distribution and actual illumination that was measured by the illumination probe at the measuring point and updating the setting intensity value and iterating several times until the error is small enough. Final, the approximate light intensity distribution of each LED calculated at this time is superimposed to calculate the light intensity distribution of the entire LED array. The method can quickly and accurately detect the distribution of light intensity of lamps on the spot, while ensuring the portable design of the whole detection system.The experimental results show that the proposed method can detect the light intensity under different conditions, and the matching degree can reach more than 93%.