Quartz enhanced photoacoustic spectrometry detection method and system using optical feedback

The invention discloses a quartz enhanced photoacoustic spectrometry detection method and system using optical feedback, and belongs to the technical field of optical feedback. The method comprises the following steps: controlling the phase of optical feedback according to laser based on a first reflector and a second reflector; matching the size of a cavity film of the laser and the size of a cavity film of the F-P cavity; establishing stable optical feedback of the laser according to the phase of the optical feedback; the laser passing through the polarizing film is transmitted to a fourth reflecting mirror, the refracted laser is refracted by a CaF2 window mirror to enter an F-P cavity matched with the laser, and the laser passing through the F-P cavity penetrates through the first resonant tube, the second resonant tube and the fork arm of the quartz tuning fork, so that a photoacoustic signal is generated based on stable optical feedback; the photoacoustic signal is enhanced based on the first resonant t