Crystallinity measurement device, resin-containing material manufacturing device, crystallinity measurement method, and resin-containing material manufacturing method

A crystallinity measurement method, comprising:

• acquiring a Raman spectrum of resin-containing material including crystalline thermoplastic resin by irradiating the resin-containing material with excitation light and spectrally dispersing Raman scattered light emitted from the crystalline thermoplastic resin contained in the resin-containing material;
• and
• calculating crystallinity of the crystalline thermoplastic resin based on an intensity of a low-wavenumber spectrum that is a spectrum in a region of less than 600 cm−1, in the acquired Raman spectrum, by calculating a ratio of the intensity of two low wavenumber spectrums,
• obtaining a correlation information indicating the correlation between the ratio of the intensity and the crystallinity of the crystalline thermoplastic resin, and
• calculating the crystallinity of the crystalline thermoplastic resin based on the calculated ratio of the intensity and the obtained correlation information.