Finite aperture correction for spectral cameras with integrated thin-film Fabry-Perot filters

Goossens Thomas; Geelen Bert; Pichette Julien; Lambrechts Andy; Van Hoof Chris

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Finite aperture correction for spectral cameras with integrated thin-film Fabry-Perot filters

机译：具有集成薄膜法布里 - 珀罗过滤器的谱相机的有限孔径校正

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Spectral cameras with integrated thin-film Fabry-Perot filters enable many different applications. Some applications require the detection of spectral features that are only visible at specific wavelengths, and some need to quantify small spectral differences that are undetectable with RGB color cameras. One factor that influences the central wavelength of thin-film filters is the angle of incidence. Therefore, when light is focused from an imaging lens onto the filter array, undesirable shifts in the measured spectra are observed. These shifts limit the use of the sensor in applications that require fast lenses or lenses with large chief ray angles. To increase flexibility and enable new applications, we derive an analytical model that explains and can correct the observed shifts in measured spectra. The model includes the size of the aperture and physical position of each filter on the sensor. We experimentally validate the model with two spectral cameras: one in the visible and near-infrared region and one in the short wave infrared region. (C) 2018 Optical Society of America

机译：具有集成薄膜法布里 - 珀罗滤光片的光谱相机能够实现许多不同的应用。一些应用需要检测仅在特定波长下可见的光谱特征，并且有些需要量化RGB彩色摄像机未检测到的小光谱差异。影响薄膜过滤器的中心波长的一个因素是入射角。因此，当光从成像镜头聚焦到过滤器阵列上时，观察到测量光谱中的不期望的偏移。这些换档限制了传感器在需要快速镜片或具有大型射线角度的镜头的应用中的使用。为了提高灵活性并实现新应用，我们推出了解释的分析模型，并可以校正测量光谱中观察到的变化。该模型包括传感器上每个滤波器的孔径和物理位置的尺寸。我们通过两种光谱相机进行实验验证模型：一个在可见光和近红外区域中的一个，在短波红外区域中的一个。（c）2018年光学学会

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来源
《Applied optics》 |2018年第26期|共11页
作者
Goossens Thomas; Geelen Bert; Pichette Julien; Lambrechts Andy; Van Hoof Chris;
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Katholieke Univ Leuven Dept Elect Engn B-3001 Leuven Belgium;

Imec Vzw Kapeldreef 75 B-3001 Leuven Belgium;

Imec Vzw Kapeldreef 75 B-3001 Leuven Belgium;

Imec Vzw Kapeldreef 75 B-3001 Leuven Belgium;

Katholieke Univ Leuven Dept Elect Engn B-3001 Leuven Belgium;

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Finite aperture correction for spectral cameras with integrated thin-film Fabry-Perot filters

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