[Papers] A Multi Spectral Imaging System with a 71dB SNR 190-1100 nm CMOS Image Sensor and an Electrically Tunable Multi Bandpass Filter
[Papers] A Multi Spectral Imaging System with a 71dB SNR 190-1100 nm CMOS Image Sensor and an Electrically Tunable Multi Bandpass Filter
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DOI：
10.3169/mta.6.187
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发表时间：
2018
影响因子：
3.6
通讯作者：
Y. Fujihara;K. Wako;S. Sugawa;Y. Aoyagi;M. Murata;Satoshi Nasuno;Shunichi Wakashima;R. Kuroda
中科院分区：
文献类型：
--
作者：
Y. Fujihara;K. Wako;S. Sugawa;Y. Aoyagi;M. Murata;Satoshi Nasuno;Shunichi Wakashima;R. Kuroda
光谱成像是将光谱学与光学成像技术相结合，获取光谱空间信息的一种分析方法。在光谱学中，通过获取光的发射、吸收、折射或散射的波长信息，分析物质的成分、浓度等特性，同时获取空间信息，可以进行成分和浓度分布的测量。此外，通过缩小分析目标区域，与单点检测器相比，提高了精度。因此，光谱成像得到了广泛的研究，并有望应用于许多领域，包括科学仪器，医学，农业等1）-4）。已经报道了几种应用，例如环境监测5），食品检查6），生物医学分析7）8）等，具有从UV到NIR的各种光波段组。一般来说，每个光谱成像应用都需要指定一组用于光谱分析的几个波段6）。光谱成像可以大致分为基于发射的成像和基于吸收的成像。在这些分析中，分别需要高灵敏度和高SNR。吸收分析是通过测量透过目标物的光强度的衰减来识别和测量目标物的化学物质的浓度。比尔-朗伯定律描述了吸收分析的原理，如以下等式所示。
Spectral imaging is an analysis method that obtains spatial information of spectrum by combining spectroscopy and optical imaging. In spectroscopy, wavelength information of light emission, absorption, refraction or scattering is obtained to analyze material characteristics, such as composition, concentration and so on. By obtaining spatial information altogether, it is possible to perform component and concentration distribution measurement. Also, by narrowing down the analysis target area, the accuracy is to be improved in comparison with a single point detector. For this reason, spectral imaging has been extensively researched and is expected to be applied to many fields including scientific instrumentation, medical, agricultural and so on1)-4). Several applications have already been reported, such as environmental monitoring5), food inspection6), biomedical analysis7)8) and so on with a variety of light waveband sets from UV to NIR. In general, a designated set of several wavebands for spectral analysis is required by each spectral imaging application6). Spectral imaging can be roughly divided into emission based imaging and absorption based imaging. High sensitivity and high SNR are required in these analyses, respectively. Here, an absorption analysis is used to identify and measure concentration of chemical substances of a target object by measuring the attenuation of light intensity that pass through it. The Beer-Lambert law describes the principle of absorption analysis as expressed by the following equation.