Direct sight imaging spectrograph: a unique add-on component brings spectral imaging to industrial applications

被引:53
作者
Hyvarinen, T [1 ]
Herrala, E [1 ]
Dall'Ava, A [1 ]
机构
[1] Spectral Imaging Ltd, SPECIM, FIN-90571 Oulu, Finland
来源
DIGITAL SOLID STATE CAMERAS: DESIGN AND APPLICATIONS | 1998年 / 3302卷
关键词
imaging spectrometry; spectral imaging; machine vision; imaging spectrograph; color; colorimetry; near infrared; CCD camera; InGaAs camera;
D O I
10.1117/12.304581
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Imaging spectrometry has mainly been a research tool, employing laboratory spectrographs and scientific cameras. This paper describes an add-on imaging spectrograph that provides a unique combination of high quality image in a small, rugged, industrial, easy-to-use component. The spectrograph is based on a prism/grating/prism (PGP) dispersing element which provides straight optical axis, astigmatism free image and polarization independent throughput. A volume holographic transmission grating is used for high efficiency (up to 70%). The tubular optomechanical construction of the spectrograph is stable and small, D30 x L110 mm with F/2.8 numerical aperture and 2/3 inch image size. Equipped with C-mounts, the spectrograph plugs between lens and area camera, converting the camera to a spectral line imaging system. The spectrograph allows the utilization of rapidly developing monochrome camera techniques, like high speed digital cameras, smart cameras and CMOS sensors, in color and spectral analytical applications. It is the first component available for upgrading existing industrial monochrome vision systems with color/spectral capability without the need to change the basic platform hardware and software. The spectrograph brings the accuracy of spectral colorimetry to industrial vision and overcomes the complex calibration that is needed when an RGB color camera is applied to colorimetric applications. Other applications include NIR imaging (up to 2500 nm), spectral microscopy, multichannel fiberoptics spectrometry and remote sensing.
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页码:165 / 175
页数:11
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