Patent ID: 7999229

Claim:
A device for detecting an electromagnetic radiation from a scene comprising a resistive imaging bolometer sensitive to the electromagnetic radiation to be detected, intended to be connected electrically to a signal shaping circuit, and a resistive common mode rejection bolometer comprising first and second terminals, said first terminal connected to a constant voltage source and said second terminal associated electrically with the imaging bolometer, so that the current flowing through the common mode rejection bolometer is subtracted from the current flowing through the imaging bolometer, wherein said device includes means for controlling a resistance of the common mode rejection bolometer by injecting current therein, and wherein the means for controlling the resistance of the common mode rejection bolometer comprises: a current source suitable for generating a predefined reference current in the common mode rejection bolometer, means for connecting the current source to the common mode rejection bolometer so that the predefined reference current flows in the common mode rejection bolometer, and means for disconnecting the current source from the common mode rejection bolometer when a voltage at the second terminal of the common mode rejection bolometer is substantially equal to a predefined reference voltage, thereby setting the resistance of the common mode rejection bolometer to the ratio of the value of the voltage across the common mode rejection bolometer to the value of the predefined reference current at the instant of disconnection from the current source.