Patent ID: 8508731

Claim:
A spectrometer capable of eliminating side-tail effects, the spectrometer comprising: a body; an input section, mounted in the body, for receiving a first optical signal and outputting a second optical signal travelling along a first light path; a diffraction grating, mounted in the body, for receiving the second optical signal and separating the second optical signal into a plurality of spectrum components, comprising a specific spectrum component travelling along a second light path; an image sensor unit, mounted in the body, for receiving the specific spectrum component; a wave-guiding device, which is mounted in the body and comprises a first reflective surface and a second reflective surface opposite to each other, wherein the wave-guiding device is for limiting the first light path and the second light path between the first reflective surface and the second reflective surface to guide the second optical signal and the specific spectrum component, wherein the first and second reflective surfaces are separated from a light receiving surface of the image sensor unit by a predetermined gap; and an adjusting mechanism, connected to the image sensor unit and the wave-guiding device, for adjusting a width of the predetermined gap.