SF6 gas decomposed product detection device and method based on photoacoustic spectrometry technology

The invention relates to the field of detection of gas decomposed products and particularly relates to an SF6 gas decomposed product detection device and an SF6 gas decomposed product detection method based on a photoacoustic spectrometry technology. The SF6 gas decomposed product detection device comprises a shell, wherein the shell is internally provided with a single chip microcomputer and an accessory circuit thereof; the single chip microcomputer and the accessory circuit thereof are connected with a power supply; the single chip microcomputer is connected with an infrared light source by a power switch tube; the infrared light source is arranged opposite to a light source entrance port of a photo-acoustic cell; the photo-acoustic cell is internally provided with a resonant cavity; circular holes communicated with the resonant cavity are formed in the two sides of the photo-acoustic cell; microphones are mounted in the circular holes in the two sides; the microphones are connected with the single chip microcomputer by lock phase amplification circuits; the single chip microcomputer is connected with a display screen; an air inlet and an air outlet which are communicated with the resonant cavity are arranged at the upper end of the photo-acoustic cell. According to the SF6 gas decomposed product detection device and method, the problems of cross interference and electrode poisoning in an electrochemical method are avoided; the system noise is lowered, the detection accuracy is improved, the structure is simple and compact, the volume is small and the stability is good.