Spectrum measuring device, spectroscopic device, and spectroscopic system

A spectrum measuring device comprising:

• a ribbon element including
• a first light reflector including a plurality of first light reflection surfaces configured to be translated in an out-of-plane direction, and
• a second light reflector including a plurality of second light reflection surfaces that are stable;
• a light detection element configured to detect, on a single light receiving surface, light quantity data indicating a light quantity of light reflected by the first light reflection surfaces and the second light reflection surfaces;
• circuitry to:
• supply a drive signal to the ribbon element in such a manner that a change of a displacement amount difference between the first light reflection surfaces and the second light reflection surfaces corresponds to a predetermined frequency;
• and
• acquire the light quantity data detected by the light detection element at a predetermined sampling frequency.