硅色敏器件对复色光色差辨识能力的数值分析

Numerical Analysis for Resolution on Color Difference of Polychromatic Light by Silicon Color Sensor with Double Junction

对复色光的光谱功率分布和色敏器件光谱响应的实验曲线进行了函数拟合,采用Mathematica4.2计算了具有不同峰值波长和半高宽的高斯分布的复色光在色敏器件中产生的电流比.计算结果表明,待测复色光的峰值波长和半高宽变化对两种典型的色敏器件的输出信号影响的权重比分别为100∶1和10∶1.权重比说明色敏器件的输出电流比随峰值波长和半高宽的变化非常灵敏,但两者权重不同,其中峰值波长的变化影响更为显著,是影响复色光颜色变化的主要因素.数值分析的结果表明,硅双结色敏器件对复色光色差有良好的辨识能力.两种器件权重比的差异说明了器件制作工艺与其辨识能力的关系,为器件合理设计提供了理论依据.

The measurement curves about the spectral power distribution of polychromatic light and spectral response of silicon color sensor with double PN junction are fitted by functions. The relation between color difference of polychromatic light and variation in peak wavelength and half-peak bandwidth is analyzed by using the software Mathematica 4.2. The result shows weighting ratios about the influence of peak wavelength and half-peak bandwidth on color difference are 100∶1 and 10∶1 for two typical color sensors. The weighting ratio shows that current ratio sensitively changes as variation in peak wavelength and half-peak bandwidth, while peak wavelength is a major factor to influence color of polychromatic light. The result of numerical analysis shows that the color sensor has considerable capability to discriminate the color difference of polychromatic light. The different weighting ratio shows it is important to design appropriate base width for the color sensor.