Ulis

Benoît Dupont

Michel Vilain

Antoine Dupret

Aurélie Touvignon

Olivier Legras

A method for detecting infrared radiation by using an array of bolometers. The following steps are used to read a bolometer of the array of bolometers: biasing the bolometer at a predetermined voltage in order to make current flow through the bolometer; subtracting a common-mode current from the current that flows through the bolometers; and producing a voltage by integrating the difference between the current that flows through the bolometers and the common-mode current.

System and method for detecting infrared radiation

An infrared radiation detection device comprising: a substrate; a matrix of at least one line of elements for detecting the radiation, each comprising a resistive imaging bolometer, the matrix being formed above the substrate; a bolometer reading circuit, a temperature measuring device for measuring the temperature in at least one point of the substrate; and a compensation circuit and data processing device for correcting the signal formed from each bolometer as a function of the temperature measured in at least one point of the substrate. The compensation circuit and data processing device capable of correcting the signal formed from the imaging bolometer by using a predetermined physical model of the temperature behavior of the signal.

Device and method for detecting infrared radiation through a resistive bolometer matrix

A device for detecting infrared radiation comprising an array of bolometers for detecting radiation; and in order to read each bolometer, a signal shaping circuitry comprising: a circuitry capable of biasing the bolometer at a predetermined voltage in order to make current flow therethrough; a circuitry capable of generating a common-mode current; and a circuitry capable of integrating the difference between the current that flows through the bolometer and the common-mode current. According to the invention, the device comprises a circuitry capable of injecting current into each bolometer in order to shift its resistance by a predetermined quantity that depends on its offset, current injection being performed prior to readout biasing of the bolometer and the shift being performed according to the direction in which the bolometer's resistance varies as a function of temperature. In addition, correction circuitry is capable of shifting the resistances of bolometers towards a common value.

A device for detecting infrared radiation including a matrix of resistive imaging bolometers above a substrate, a read circuit forming an analog electrical signal constituting an image of the infrared radiation impinging on the matrix, a probe for measuring the temperature of the substrate, an ADC for converting the analogue electrical signals from the read circuit and probe, and a data processing unit for correcting the signal formed by the read circuit according digital values NC(i,j) corresponding to electrical signals from the bolometers exposed to a uniform scene at the measured temperature of the substrate. The data processing unit including a unit for computing the digital values NC(i,j) based on a single set of parameters of a predetermined physical model of the read circuit electrical signals and corresponding to the exposure of the matrix of imaging bolometers to a temperature substantially equal to the measured substrate temperature.

A device for detecting infrared radiation including a resistive imaging bolometer intended to be electrically connected to a circuit for measuring a resistance of the imagine bolometer, whereby the device initially controls and adjusts the resistance of the imaging bolometer by injecting current into the imaging bolometer.

Device for detecting infrared radiation comprising a resistive imaging bolometer, a system comprising an array of such bolometers and a method for reading an imaging bolometer integrated into such a system

A device for detecting infrared radiation comprising an array of bolometric detectors which are sensitive to incident radiation and are referred to as 'active' and a bolometer which is insensitive to said radiation and is referred to as 'blind' formed on a substrate in which a read circuit is produced for sequentially addressing each of the rows of detectors of the array, each of the active bolometers in a single row being biased simultaneously. The read circuit also comprises means of producing a reference current (I) based on the blind bolometer; means of simultaneously copying the reference current (I) for each column of the array; and a plurality of current integrators, each associated with one column of the array and each designed to integrate the difference between the current flowing through the active bolometer of the row which is currently being read and said thus copied reference current.

Device for detecting infrared radiation with bolometric detectors

A device for detecting electromagnetic radiation, especially infrared radiation, including an array of elementary bolometers which are sensitive to the incident radiation and are referred to as 'active' bolometers and an additional row of bolometers which are substantially insensitive to the radiation and are referred to as 'blind' bolometers. The active and blind bolometers are formed on a substrate in which a read circuit is produced for sequential addressing of each of the rows of the array and the row of blind bolometers, each of the bolometers in the same row being biased simultaneously. The read circuit includes a source for producing a reference current (I) on the basis of an additional blind bolometer which is also formed on the substrate and means of copying the reference current (I) to each of the columns of the array consisting of a current mirror.

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Brussels, Belgium

Benoît Dupont