Patent ID: 8674307
Filing Date: 2014-03-18
Classification: G01J,H04N

Abstract:
1. A device for detecting infrared radiation comprising: an array of bolometers for detecting infrared radiation; and in order to read each of said bolometers, a signal shaping circuit comprising: wherein the device comprises correction circuitry for correcting the resistance of the bolometers that injects current into each of said bolometers in order to shift the resistance by a predetermined quantity that depends on an offset of said bolometer, current injection being performed prior to readout biasing of the bolometer and the shift being performed according to the direction in which the resistance of the bolometer varies as a function of temperature and wherein the correction circuitry shifts the resistances of said bolometers towards a common value, wherein the correction circuitry comprises the following circuit elements in order to inject current into the bolometer: a constant current source; a first controllable switch that connects and disconnects the current source to or from the bolometer; and comparison circuitry that compares the voltage across the terminals of the bolometer with a first predetermined voltage that depends on the offset and opens the first controllable switch, thereby disconnecting the constant current source from the bolometer, when the voltage across the terminals of the bolometer equals the first predetermined voltage.