Characteristic information extraction method and portable detection system for small-molecule volatile substances

A detection method for a small-molecule volatile substance, comprising:

• (1) generating a pulse laser, by a light source, to form a laser beam, and focusing the laser beam on the small-molecule volatile substance;
• (2) receiving and processing laser beam scattered by the small-molecule volatile substance to obtain a surface-enhanced Raman scattering (SERS) spectrum of the small-molecule volatile substance;
• (3) dividing the SERS spectrum of the small-molecule volatile substance to obtain n wavelength subintervals;
• wherein n is a positive integer;
• (4) sampling the n wavelength subintervals through weighted bootstrap sampling (WBS) to obtain W wavelength subintervals;
• wherein W is a positive integer less than n;
• (5) screening the Wwavelength subintervals to obtain a desired wavelength subset;
• and
• (6) inputting the desired wavelength subset into an estimation model to construct a mathematical relationship between content of the small-molecule volatile substance and the desired wavelength subset.