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

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

• a surface-enhanced Raman scattering (SERS) response medium;
• a reaction device;
• a Raman spectrum detection device;
• and
• a server;
• wherein the SERS response medium is configured to enhance a Raman scattering intensity of the small-molecule volatile substance;
• the reaction device is configured to allow the small-molecule volatile substance and the SERS response medium to react thereon;
• the Raman spectrum detection device is configured to collect a SERS spectrum of the small-molecule volatile substance after a reaction between the small-molecule volatile substance and the SERS response medium, and send the SERS spectrum to the server;
• wherein the Raman spectrum detection device comprises:
• a light source module;
• a light path module;
• a signal processing module;
• and
• a control module;
• the control module is in wire connection with the light source module, the light path module and the signal processing module;
• the light source module comprises a semiconductor laser and a pulsed laser device;
• and the pulsed laser device is configured to generate a pulse laser and transmit the pulse laser to the light path module;
• the light path module comprises an attenuation assembly, a beam expansion-shaping assembly and a collection assembly;
• the signal processing module comprises a spectrometer and a detector;
• the control module comprises a time-sequence controller;
• the time-sequence controller is connected to the pulsed laser device and the detector, and is configured to adjust the pulsed laser device and the detector, so as to realize synchronization between a pulse time sequence of the pulsed laser device and a shutter time sequence of the detector;
• the server is signally connected to the Raman spectrum detection device;
• and the server is configured to perform a detection method for the small-molecule volatile substance through steps of:
• (1) generating the pulse laser, by the pulsed laser device, to form a first laser beam, and focusing the first laser beam on the small-molecule volatile substance;
• (2) receiving and processing a second laser beam scattered by the small-molecule volatile substance to obtain the 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 W wavelength 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.