"光栅摄谱仪" can be translated into English as "grating spectrograph" or "grating spectrometer".
"Grating" refers to the key component that disperses light into its component wavelengths.
"Spectrograph" typically emphasizes the recording or imaging aspect of the spectrum, while "spectrometer" focuses more on the measurement of the spectrum. Both terms are widely used in scientific contexts, and the choice between them may depend on the specific application or emphasis of the device.
In most cases, especially in general scientific discussions, "grating spectrograph" would be a suitable and accurate translation.