Luan Yinsen, Mei Di, Shi Shengxian
Opt Lett. 2021 Jan 1;46(1):9-12. doi: 10.1364/OL.408437.
This Letter proposes light-field multi-spectral radiation thermometry based on an unfocused light-field camera, which can simultaneously record directions and intensities of incident rays. In this method, the direction information of rays is substituted by radiation spectrums via placing an array of filters in front of camera main lens, such that the image sensor can simultaneously acquire spectrums and intensities of rays. By decoupling a raw multi-spectral light-field (MSLF) image and utilizing traditional multi-wavelength pyrometer algorithms, the scalar field of surface temperature distribution can be achieved. To verify the method, measurement errors of different temperature levels on several typical areas of MSLF images are analyzed. In addition, the validation experiment demonstrates that accurate surface temperature measurement can be achieved with a single lens, single monochromatic image sensor, and just one snapshot in the proposed method.
本文提出了一种基于非聚焦光场相机的光场多光谱辐射测温法，该方法能够同时记录入射光线的方向和强度。在此方法中，通过在相机主镜头前放置一组滤光片，利用辐射光谱替代光线的方向信息，使得图像传感器能够同时获取光线的光谱和强度。通过解耦原始多光谱光场（MSLF）图像并利用传统多波长高温计算法，可实现表面温度分布的标量场。为验证该方法，分析了MSLF图像几个典型区域不同温度水平下的测量误差。此外，验证实验表明，在所提出的方法中，使用单个镜头、单个单色图像传感器且仅拍摄一张快照就能实现精确的表面温度测量。
