Gas sensor based on non-dispersive infrared detection

A gas sensor based on non-dispersive infrared (NDIR) detection, comprising a base, a tube cap, at least one detection module, and at least one infrared source module, wherein

• the tube cap covers the base, and the outer edge of the tube cap is fixedly connected to the base;
• the base is provided with at least one base through hole penetrating the base;
• and the side wall of each of the base through holes extends away from the tube cap to form a hollow tube core;
• each of the infrared source modules covers and is arranged at the end of the base through hole facing the tube cap, and a cavity in the infrared source module is connected to one of the base through holes;
• and an air hole is provided on the wall of each of the tube cores;
• pins pass through the base, and ends of the pins extend into one side of the infrared source module, wherein a heating layer in the infrared source module is electrically connected to the ends of the pins by metal wires;
• and
• each of the detection modules is assembled at the end of one of the tube cores away from the infrared source module, and seals the end of the tube core;
• each of the detection modules is provided with at least one infrared detector, and each of the infrared detectors is provided with a narrowband filter at the end facing the infrared source module;
• and detection pins electrically connected to each of the infrared detectors extend from the inside of the detection module to the outside thereof.