A coded aperture is used to demonstrate emission spectroscopy from multiple one-dimensional measurement locations simultaneously with a single camera. The coded aperture mask has several columns of periodic apertures, each with a unique spatial frequency. Light transmitted through all mask columns is detected through an imaging spectrometer. Dispersed light from the various mask columns overlaps on the spectrometer camera but is separated using Fourier-domain filtering using the known spatial frequencies of the mask. As the coded aperture is placed at an image plane, each Fourier-filtered spectrogram comes from a unique one-dimensional measurement location. This technique represents a significant increase in the amount of spatially and spectrally resolved emission data available using a single emission spectrometer and camera at the expense of some spatial resolution due to the Fourier filtering. This instrument is particularly useful for studying transient, non-repeating events. Megahertz-rate emission spectroscopy from five one-dimensional measurement locations is demonstrated with explosive fireballs using a single camera. Optical design parameters and instrument performance characteristics are discussed.

中文翻译：

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带有编码孔径的发射光谱，以提高维度

编码孔径用于演示从多个一维测量位置同时使用单个相机的发射光谱。编码孔径掩模具有多列周期性孔径，每列具有唯一的空间频率。通过成像光谱仪检测透射过所有掩模柱的光。来自不同掩膜列的分散光在光谱仪相机上重叠，但使用傅立叶域滤波使用掩膜的已知空间频率进行分离。由于编码孔径位于图像平面上，因此每个傅立叶滤波频谱图都来自唯一的一维测量位置。这种技术代表了使用单个发射光谱仪和相机可获得的空间和光谱分辨发射数据量的显着增加，但代价是由于傅立叶滤波导致的一些空间分辨率。该仪器对于研究瞬态、非重复事件特别有用。来自五个一维测量位置的兆赫兹率发射光谱通过使用单个相机的爆炸性火球进行演示。讨论了光学设计参数和仪器性能特征。