This invention relates to a method and an active system for detection and localization of early stage forest fires using lidar. The first microprocessor is disposed close to an input device such as a keypad, and the second microprocessor is disposed close to the lock mechanism and well protected from external access. and pressure range from 20 psig to 500 psig, and wherein the scrubbing liquid resulting from the exposure of the dimethyl ether containing stream to the absorption column is directed to a flash evaporation unit operating at 25\xb0 C. Using that determination, a signal modification can be initiated to substantially reduce or eliminate all signal-path processing error. The container is manufactured so that the opening in the walls can be opened by manually removing the cover, either partially or completely.