Patent ID: 7424372

Claim:
A method of measuring a physical or chemical phenomenon comprising: feeding electric charge from a charge feeding portion to a sensing portion having potential changed depending on the magnitude of physical or chemical amount, removing the fed electric charge via a charge accumulation region and a floating diffusion region from the sensing portion, and detecting the amount of the fed electric charge by allowing the electric charge from the sensing portion to be accumulated in a charge accumulation portion before entering the floating diffusion region, to release a part of the electric charge that is corresponding to an offset potential or external disturbing component, and simultaneously transmitting, to the floating diffusion region, the amount of electric charge containing the electric charge corresponding to the potential corresponding to the magnitude of physical or chemical amount, measuring a physical or chemical phenomenon by a pair of detection systems consisting of a detection system A having a sensing portion having potential changed depending on the magnitude of physical or chemical amount, and a detection system B having a sensing portion not responding to a change in physical or chemical amount and having the same function as that of the detection system A except for the sensing portion, wherein the amount of electric charge released in the detection system A is changed by synchronizing with the amount of the electric charge accumulated in the stage before the floating diffusion region in the detection system B and wherein the release amount of electric charge is changeable.