An infra red (IR) sensor arrangement is provided herein. The IR sensor arrangement includes: at least one IR detector; at least one cold finger, each connected to a corresponding at least one of the at least one IR detector; a compressor thermally coupled to the at least one cold finger via at least one tube; and at least one package, each shaped to cover at least a corresponding cold finger with the corresponding at least one IR detector, wherein in respect to each cold finger and corresponding at least one IR detector, a center of mass of the cold finger is positioned between the corresponding at least one IR detector and the compressor.