Photoacoustic cell for gas photoacoustic spectral detection

The invention discloses a photoacoustic cell for gas photoacoustic spectral detection. The photoacoustic cell comprises a first buffer chamber and a second buffer chamber which are symmetrically arranged on the two sides of the central axis of the photoacoustic cell; a gas inlet for piping in the gas to be measured and a gas outlet for discharging the gas to be measured, wherein the gas inlet is communicated with the first buffer chamber and the gas outlet is communicated with the second buffer chamber; a light incident port for enabling incident light to enter the first buffer chamber from the first Brewster window and a light emergent port for enabling the incident light to exit the second buffer chamber from the second Brewster window; a resonant cavity which is a cylindrical quartz hollow glass tube and communicated with the first buffer chamber and the second buffer chamber; and a microphone which is arranged in the resonant cavity and used for detecting an acoustic signal. The resonant cavity of the pho