The Multichannel Subtractive Double Pass (MSDP) is an imaging spectroscopy technique, which allows observations of spectral line profiles over a 2D field of view with high spatial and temporal resolution. It has been intensively used since 1977 on various spectrographs (Meudon, Pic du Midi, the German Vacuum Tower Telescope, THEMIS, Wrocław). We summarize previous developments and describe the capabilities of a new design that has been developed at Meudon and that has higher spectral resolution and increased channel number: Spectral Sampling with Slicer for Solar Instrumentation (S4I), which can be combined with a new and fast polarimetry analysis. This new generation MSDP technique is well adapted to large telescopes. Also presented are the goals of a derived compact version of the instrument, the Solar Line Emission Dopplerometer (SLED), dedicated to dynamic studies of coronal loops observed in the forbidden iron lines, and prominences. It is designed for observing total solar eclipses, and for deployment on the Wrocław and Lomnicky peak coronagraphs respectively for prominence and coronal observations.

多通道减法双通道（MSDP）是一种成像光谱技术，可在2D视场上以高时空分辨率观察光谱线轮廓。自1977年以来，它已广泛用于各种光谱仪（Meudon，Pic du Midi，德国真空塔望远镜，THEMIS，弗罗茨瓦夫）。我们总结了以前的发展并描述了Meudon开发的具有更高光谱分辨率和增加通道数的新设计的功能：带有用于太阳能仪器的切片器的光谱采样（S4I），可以与新的快速极化仪结合使用分析。新一代MSDP技术非常适合大型望远镜。还介绍了该仪器的紧凑型版本的目标，即太阳能线发射多普勒仪（SLED），致力于动态研究在禁止铁系和突起中观察到的冠状loop。它设计用于观测日全食，并分别部署在弗罗茨瓦夫和洛姆尼克峰日冕仪上以进行日冕和日冕观测。