Abstract: A radiation sensor including a plurality of pixels formed in and on a semiconductor substrate, each pixel including a microboard suspended above the substrate by thermal insulation arms, the microboard including: a conversion element for converting incident electromagnetic radiation into thermal energy; and a passive optical shutter including a heat-sensitive layer covering one of the faces of the conversion element, the heat-sensitive layer having a reflection coefficient for the radiation to be detected that increases as a function of its temperature.

Abstract: A method for optimizing values of n detection wavelengths of an optical gas sensor configured to detect n different gases is provided, including: a) calculating a value of a determinant of an absorptivity matrix ? whose coefficients represent spectral absorptivity of each of the n different gases at the n detection wavelengths, the calculating being repeated several times, each time modifying at least one of said n detection wavelengths so the values of said n detection wavelengths are comprised within a range of values for which the spectral absorptivity of at least one of the n different gases is non-zero; and b) determining the values of said n detection wavelengths for which the calculated value of the determinant of the absorptivity matrix ? corresponds to a maximum calculated value amongst a set of values calculated in step a).

Abstract: A sensor of thermal patterns of an object, of papillary print sensor type, including a contact surface to apply the object thereon. The sensor includes at least one capsule sealed under vacuum, arranged between a substrate and the contact surface, suited to exchanging heat with the object and to emitting electromagnetic radiation as a function of its temperature; inside each capsule, at least one bolometric plate, to convert incident electromagnetic radiation into heat; at least one optical filter, to stop electromagnetic radiation in the infrared, each capsule being covered by an optical filter; with reading the electrical resistances of the bolometric plates. Such a print sensor offers both good insulation between the substrate and the sensitive elements, and good mechanical strength.

Abstract: Method for optimising the values of n detection wavelengths of an optical gas sensor capable of carrying out detection of n different gases, comprising the implementation of the following steps: a) calculation of a value of a determinant of an absorptivity matrix ? whose coefficients represent the spectral absorptivity of each of the n gases at n detection wavelengths, step a) being repeated several times, each time modifying at least one of said n detection wavelengths and such that the values of said n detection wavelengths are comprised within a range of values for which the spectral absorptivity of at least one of the n gases is non-zero; b) determination of the values of said n detection wavelengths for which the value of the determinant of the absorptivity matrix ? corresponds to the maximum value amongst the set of previously calculated values.

Abstract: Infrared detection device comprising at least one first bolometer able to detect at least a part of infrared radiation intended to be received by the infrared detection device, and a reading and compensation circuit of a first electrical signal intended to be outputted by the first bolometer, with the reading and compensation circuit comprising at least: one second bolometer coupled electrically to the first bolometer and insensitive to the infrared radiation intended to be received by the infrared detection device; one first reading circuit of said first electrical signal from which is subtracted a second electrical signal intended to be outputted by the second bolometer; one second reading circuit of an electrical voltage at the terminals of the first bolometer and/or of an electrical voltage at the terminals of the second bolometer, comprising a plurality of switches.

Abstract: Infrared detection device comprising at least one first bolometer able to detect at least a part of infrared radiation intended to be received by the infrared detection device, and a reading and compensation circuit of a first electrical signal intended to be outputted by the first bolometer, with the reading and compensation circuit comprising at least: one second bolometer coupled electrically to the first bolometer and insensitive to the infrared radiation intended to be received by the infrared detection device; one first reading circuit of said first electrical signal from which is subtracted a second electrical signal intended to be outputted by the second bolometer; one second reading circuit of an electrical voltage at the terminals of the first bolometer and/or of an electrical voltage at the terminals of the second bolometer, comprising a plurality of switches.