Infrared sensor and infrared gas detector

An infrared gas detector comprising a housing, an infrared light source and an infrared sensor, the infrared sensor comprising:

• a first electrode;
• a substrate being provided on an upper surface of the first electrode;
• an isolation layer being provided on an upper surface of the substrate;
• a second electrode being provided on an upper surface of the isolation layer;
• and
• a graphene film being covered on at least a part of the second electrode, and the graphene film having periodic nanostructures, the periodic nanostructures being a plurality of hole-like structures;
• the housing being provided with a through hole, and the housing comprising:
• a first housing which has a first chamber communicating with the through hole, an inner surface of a side wall of the first housing being provided with a first reflection surface, a second reflection surface, a third reflection surface and a fourth reflection surface;
• and
• a second housing which is connected to the first housing, the second housing being provided with a first channel and a second channel spaced apart from each other, the first channel being in communication with the first chamber, the second channel being in communication with the first chamber, the infrared light source being arranged in the first channel, the infrared sensor being arranged in the second channel, an infrared light emitted by the infrared light source being transmitted to the first reflection surface along the first channel, and being reflected to the fourth reflection surface sequentially via the first reflection surface, the second reflection surface and the third reflection surface, the infrared light incident on the fourth reflection surface being reflected by the fourth reflection surface and being transmitted to the infrared sensor along the second channel, a plane on which an optical path of the infrared light in the first channel and an optical path in the second channel are located being a first plane, a plane where an optical path of the infrared light is reflected to the fourth reflection surface sequentially via the first reflection surface, the second reflection surface and the third reflection surface being a second plane, and the second plane and the first plane being perpendicular to each other.

An air quality detection device comprising an infrared gas detector and a first processor, the infrared gas detector comprising a housing, an infrared light source and an infrared sensor, the infrared sensor comprising:

• a first electrode;
• a substrate being provided on an upper surface of the first electrode;
• an isolation layer being provided on an upper surface of the substrate;
• a second electrode being provided on an upper surface of the isolation layer;
• and
• a graphene film being covered on at least part of the second electrode, and the graphene film having periodic nanostructures, the periodic nanostructures being a plurality of hole-like structures;
• the housing being provided with a through hole, and the housing comprising:
• a first housing which has a first chamber communicating with the through hole, an inner surface of a side wall of the first housing being provided with a first reflection surface, a second reflection surface, a third reflection surface and a fourth reflection surface;
• and
• a second housing which is fixed to the first housing, the second housing being provided with a first channel and a second channel spaced apart from each other, the first channel and the second channel being in communication with the first chamber, the infrared light source being arranged in the first channel, the infrared sensor being arranged in the second channel, the infrared light source being capable of emitting an infrared light which is transmitted to the first reflection surface along the first channel, and reflected to the fourth reflection surface sequentially via the first reflection surface, the second reflection surface and the third reflection surface, the infrared light incident on the fourth reflection surface being reflected by the fourth reflection surface so as to be transmitted to the infrared sensor along the second channel;
• wherein
• the first processor is electrically connected with the infrared gas detector to receive and process a gas concentration information sent by the infrared gas detector.