作者：甘振华1,3, 杜民1,3, 高跃明2,3, 熊保平2,3, 杨丕胤2,3
作者单位：1. 福州大学电气工程与自动化学院, 福建 福州 350116;
2. 福州大学物理与信息工程学院, 福建 福州 350116;
3. 福建省医疗器械和医药技术重点实验室, 福建 福州 350116
关键词：光强响应;电荷耦合器件;成像方式;大功率LED;非线性
摘要：
针对电荷耦合器件（charge-coupled device，CCD）的光强响应曲线的测量，提出采用大功率LED作为线性光源，设计基于成像方式的光强响应信号的测量装置。通过控制恒流激励电流大小来调节LED的辐射输出并测量CCD的响应数据。根据CCD响应信号拟合出对应的光强响应曲线，并建立光电响应模型分析CCD饱和与非饱和的响应特性。实验结果表明：CCD的光强响应受到LED发光角和辐射模式的影响，当采用LED作为CCD光强响应测量的线性可调光源时，不能忽视LED光强分布的近朗伯特性；同时，H694C-II相机输出灰度值大于61713时CCD ICX694AL的光强响应曲线出现较明显的饱和非线性，但在非饱和区域CCD具有优良的线性响应特性。
Measurement of CCD light intensity response characteristics based on LED
GAN Zhenhua1,3, DU Min1,3, GAO Yueming2,3, XIONG Baoping2,3, YANG Piyin2,3
1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116, China;
2. College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China;
3. Key Lab of Medical Instrumentation & Pharmaceutical Technology of Fujian Province, Fuzhou 350116, China
Abstract: To measure the light intensity response curve of the charge-coupled device(CCD), an LED with high power was proposed as a linear light source for the design of a light intensity response signal measuring device based on imaging technology. The intensity response data of CCD were obtained by regulating the LED rediation output via controlling the constant excitation current of LED. Corresponding light intensity response curves were fitted according to the response signals of CCD intensity response and also, a photoelectric response model was built to analyze the saturated and unsaturated response characteristics of CCD. Test results show that the light intensity response of CCD is influenced by the radiation angle and radiation pattern of LED. When LED is used as an adjustable linear light source for measurement of light intensity response of CCD, the near Lambert characteristics of the distribution of LED light intensity should not be ignored. Meanwhile, if the output grey level of H694C-II camera is greater than 61 713, the light intensity response curve of CCD ICX694AL will have obvious saturation nonlinearity, but CCD has excellent linear response characteristics in the unsaturated region.
Keywords: light intensity response;CCD;imaging modality;high power LED;nonlinearity
2016, 42(12): 121-125 收稿日期: 2016-03-29;收到修改稿日期: 2016-04-27
基金项目: 科技部合作项目（2012DFM30040）；福建省科技重大专项项目（2013YZ0002，2014YZ0001）
作者简介: 甘振华(1977-),男,福建屏南县人,工程师,博士研究生,主要从事生物医学传感技术及医疗器械的研究。
参考文献
[1] 任建伟,张艳琪,叶钊,等. CCD辐射响应函数矩阵的建立与应用[J]. 光学精密工程,2012,20(5):957-962.
[2] 赵友全,江磊,何峰,等. 线阵CCD光电响应非线性特性测定与分析[J]. 光电工程,2015,42(7):19-23.
[3] 肖韶荣,杨丽,吴群勇,等. 紫外LED圆环阵列均匀照明的实现方法[J]. 应用光学,2013,34(5):742-747.
[4] 王加文,苏宙平,袁志军,等. LED阵列模组化中的照度均匀性问题[J]. 光子学报,2014,43(8):0822004-1-0822004-6.
[5] 王宝,余荣斌,李丰果. 多颗LED模组系统的排列方式及参数对光照均匀性的影响[J]. 照明工程学报,2013,24(5):78-83.
[6] 吴波,符泰然,程晓舫,等. 彩色数码相机光强响应特性的标定实验[J]. 光电工程,2006,33(6):101-105.
[7] 费翔,钱可元,罗毅. 大功率LED结温测量及发光特性研究[J]. 光电子·激光,2008,19(3):289-292,299.
[8] 林介本,郭震宁,陈丽白,等. 瓦级大功率InGaN蓝光LED的光色电特性[J]. 发光学报,2009,30(3):379-384.
[9] 蔡德芳,史晓华,文建国,等. CCD探测器的饱和阈值的光谱特性研究[J]. 激光杂志,2000,21(3):14-15.
[10] 张震,程湘爱,姜宗福. 强光致CCD过饱和效应机理分析[J]. 强激光与粒子束,2010,22(2):236-327.
[11] 郝向南,聂劲松,李化. CCD强光饱和效应的温度因素分析[J]. 光电工程,2011,38(7):54-58.
[12] 周建康,沈为民,唐敏学. CCD测量动态范围的扩展技术[J]. 光电工程,2006,33(10):96-100,114.
[13] 雷仁方,王晓强,杨洪,等. CCD纵向溢出漏结构工艺仿真与实现[J]. 半导体光电,2013,34(5):775-777.
