Electromagnetic radiation detection system comprising: - an enclosure provided with a wall with a bottom, a top and at least one side wall connecting the bottom and the top, the enclosure being closed and tightly sealed, - a detection circuit configured to detect an electromagnetic radiation and to supply an electrical signal representative of the detected electromagnetic radiation, - a cooler fixed to the enclosure and configured to cool the detection circuit, the cooler being of Joule-Thomson or Stirling type, - a cold table supporting the detection circuit, - a cold shield fixed to the cold table, - a support configured to fit the cold table fixedly with respect to the enclosure, the support defining a first mechanical connection between the cold table and the wall of the enclosure, the support being fixed to the enclosure independently from the cooler, - a thermal connector having a first end fixed to the cooler and a second end fixed to the cold table or to the cold shield so that the cooler cools the detection circuit, wherein the detection circuit, the cold table, the cold shield and support are arranged in the enclosure, electromagnetic radiation detection system characterised in that: - the thermal connector is a deformable thermal connector that defines a flexible mechanical connection between the cooler and the cold table or to the cold shield, - the support is a thermally insulating support that thermally insulates the cold table with respect to the wall of the enclosure. - an enclosure provided with a wall with a bottom, a top and at least one side wall connecting the bottom and the top, the enclosure being closed and tightly sealed, - a detection circuit configured to detect an electromagnetic radiation and to supply an electrical signal representative of the detected electromagnetic radiation, - a cooler fixed to the enclosure and configured to cool the detection circuit, the cooler being of Joule-Thomson or Stirling type, - a cold table supporting the detection circuit, - a cold shield fixed to the cold table, - a support configured to fit the cold table fixedly with respect to the enclosure, the support defining a first mechanical connection between the cold table and the wall of the enclosure, the support being fixed to the enclosure independently from the cooler, - a thermal connector having a first end fixed to the cooler and a second end fixed to the cold table or to the cold shield so that the cooler cools the detection circuit, wherein the detection circuit, the cold table, the cold shield and support are arranged in the enclosure, electromagnetic radiation detection system characterised in that: - the thermal connector is a deformable thermal connector that defines a flexible mechanical connection between the cooler and the cold table or to the cold shield, - the support is a thermally insulating support that thermally insulates the cold table with respect to the wall of the enclosure. - the thermal connector is a deformable thermal connector that defines a flexible mechanical connection between the cooler and the cold table or to the cold shield, - the support is a thermally insulating support that thermally insulates the cold table with respect to the wall of the enclosure.