Explosive and poisoned gases leakage causes the danger for people both in industry and at home. The example is the methane in coal mines. The imaging systems presenting the distribution of gas concentration from a distance is the alternative for widely-used single detector sensors. Moreover, due to the warming effect, climate changes and environment protection, there is a growing interest of using remote gas imaging systems. We do both the research and developments in this field. As the example, the high-sensitive bolometer cameras we have successfully used for detection methane, ammonia and carbon dioxide (CH4, NH3, and CO2).