消费级相机可见光光谱仪及应用  

Consumer Camera Visible Light Spectrometer and Application

作　　者：吴梦添 王庆康[1] WU Mengtian;WANG Qingkang(Key Laboratory for Thin Film and Microfabrication Technology of Ministry of Education,Shanghai Jiao Tong University, Shanghai 200240, China)

机构地区：[1]上海交通大学薄膜与微细技术教育部重点实验室,上海200240

出　　处：《实验室研究与探索》2019年第3期81-84,89,共5页Research and Exploration In Laboratory

摘　　要：利用相机将光信号转化为数字信号的原理,设计了一款由消费级RGB相机、透射光栅、暗盒组成的可见光光谱仪。通过让相机拍摄静态场景多曝光时间下的数张照片,根据同像素坐标下不同曝光时间图片中的像素值,应用最小二乘法拟合获取相机的亮度响应曲线,从而得到像素值和相对辐射强度的对应关系。然后用RGB相机拍摄被透射光栅分光后的测试光源的光谱图,根据推导出的亮度响应曲线得到光谱图上像素的相对辐射强度值,从而模拟出测试光源可见光范围的光谱分布。用设计的光谱仪模拟了LED光源的可见光光谱分布,并且用于检测LED光源的蓝光含量。A visible light spectrometer consisting of consumer-grade RGB camera, transmission grating, and cassette is designed by using the principle of converting optical signals into digital signals. During its working process, the relationship between the pixel values and the relative radiation intensity is obtained based on the camera brightness response curve. The curve is depicted by taking several photos in the static scene under multiple exposure times, and utilizing the least squares fitting method the pixel values in the photos are analyzed under the same pixel coordinates. Then, the spectrum of the test light source, which is split by the transmission grating, is taken by the RGB camera, and the relative radiation intensity value of the pixel on the spectrum is acquired according to the derived brightness response curve. The visible light range of the test light source could be deduced according to the relative radiation intensity value. Finally, the visible light spectrum distribution of the LED light source is simulated with the novel-designed spectrometer and used to detect the component of blue light in LED light source.

关 键 词：消费级相机 相机亮度响应曲线 透射光栅 可见光光谱仪 

分 类 号：O436.1[机械工程—光学工程]