Miniature high-resolution infrared gas sensor

The utility model provides a miniature high-resolution infrared gas sensor, which comprises a casing, a powder metallurgy net, an output pin, an infrared gas detector and an infrared light supply. An optical cavity, a signal control and acquisition circuit board and a main circuit board are sequentially arranged in the casing. An optical channel is arranged in the optical cavity, a through hole is arranged on the optical cavity, and the infrared gas detector and the infrared light supply are arranged at two ends of the optical channel respectively. The inner end of the output pin is connected with a main control circuit, the optical channel is in a C shape with a plurality of continues ray reflecting surfaces, a reflector for reflecting the infrared light sent by the infrared light supply is arranged in the optical channel, and the reflector is arranged correspondingly to the detecting end of the infrared gas detector. The sensor adopts the C-shaped optical channel in a small space, thereby enabling optical p