Double-layer turret multi-grating on-axis rotation module and spectrometer

A spectrometer, wherein the spectrometer comprises a double-layer turret multi-grating on-axis rotation module,

• wherein the double-layer turret multi-grating on-axis rotation module comprises:
• a grating turret assembly, wherein the grating turret assembly comprises a turret base and a plurality of grating elements with different spectral resolutions, and the plurality of grating elements are vertically arranged on a top face of the turret base, and the plurality of grating elements are arranged in a coordinated manner to form a polygonal prism structure;
• a first rotation assembly, wherein the first rotation assembly is disposed below the grating turret assembly, a bottom face of the turret base is connected to the top of the first rotation assembly, a rotation axis of the first rotation assembly is on a same vertical line as a central axis of a plurality of grating elements, and the grating turret assembly is driven to rotate by the first rotation assembly to change the grating elements receiving light;
• and
• a second rotation assembly, wherein the second rotation assembly is disposed below the first rotation assembly, a bottom of the first rotation assembly is connected to a top of the second rotation assembly, and a rotation axis of the second rotation assembly is offset vertically from the rotation axis of the first rotation assembly;
• wherein in a horizontal direction, the distance between the rotation axis of the second rotation assembly and the rotation axis of the first rotation assembly is equal to the distance between the rotation axis of the first rotation assembly and the grating element, so that the grating element receiving light and the rotation axis of the second rotation assembly are located on a same vertical line, and the first rotation assembly is driven to rotate by the second rotation assembly.