Aiming at the gas sensor monitoring and image display system in the fire, a gas detection system based on porphyrin chemical sensor was developed. According to the principle that the reaction between porphyrin and organic gas will produce color change, CCD is used to collect the image of porphyrin chemical sensor array and the target gas before and after the chemical reaction. Image processing technology is used to obtain the characteristic information of the target gas, and a suitable pattern recognition algorithm is used to detect the target gas. The system was used to detect nine kinds of VOCs and ammonia. The results show that the method is effective in the identification of VOCs and the quantitative detection of ammonia gas. The upper computer software system and pattern recognition method of gas detection system are studied. The signal acquisition function is completed, and the signal processing and analysis system is realized. The system can detect nine kinds of common VOCs and perform quantitative image processing.
