Abstract: Disclosed are a high-temperature proton exchange membrane, a preparation method and use thereof. The preparation method includes: mixing 1-methylimidazole with 3-chloropropyltriethoxysilane, conducting a reaction to obtain 1-methyl-3-[(triethoxysilyl)propyl]imidazole chloride; mixing the 1-methyl-3-[(triethoxysilyl)propyl]imidazole chloride with a suspension of titanium dioxide, and subjecting a resulting mixture to modification to obtain a modified titanium dioxide; and mixing the modified titanium dioxide, a polybenzimidazole powder and a solvent, and casting an obtained mixture on a substrate to obtain the high-temperature proton exchange membrane.

Abstract: A high-precision double-range infrared gas sensor includes a chamber. A reflective portion, configured as an enclosed structure, is arranged on an inner wall of the chamber. A first light source, a second light source and an infrared detector are arranged in an interior space of the chamber. During measurement, lights emitted by the first light source and the second light source are controlled in a time-sharing manner, to be reflected in the chamber to form a long measurement light path and a short measurement light path, thereby implementing detection of a to-be-measured gas with a low-range concentration and a to-be-measured gas with a high-range concentration. The invention solves the technical problem that simultaneous measurement of a low-range concentration and a high-range concentration is unavailable in the prior art, may be used for both air quality monitoring of HVAC and CO2 safety and leakage monitoring of heat pumps.