Disclosed herein is a device for quantitatively supplying a liquid in a plasma sterilization system. Fuel temperature characteristics at and following an engine start are determined, and the degree of cooling during non-operation of the engine is determined based at least partly on the fuel temperature characteristics. Additionally, the CMOS imager having a doped polysilicon contact between the floating diffusion region and the source follower transistor gate allows the source follower transistor to be placed closer to the floating diffusion region, thereby allowing a greater photo detection region in the same sized imager circuit.