Abstract: A heating device for a spectrometry measurement apparatus, wherein it is in the form of a supple optical article, the article comprising a supple flexible support having a top face and a bottom face, the top face being covered with a reflective material in order to form an optical-reflection layer, a flexible heating element being disposed on at least one of the faces of the support.

Abstract: A measuring vessel in which a gas to be analyzed by spectrometry is intended to flow, the vessel being in the form of a hollow tube provided with a reflective material forming an optical-reflection layer, including: a hollow tube is produced from a non-metallic material, and a removable supple optical article is applied against the internal surface of the hollow tube, the article including a supple flexible support, one face of the support being covered with a reflective metal material, the article being inserted in the tube so that the reflective metal material forms the optical-reflection layer.

Abstract: A heating device for a spectrometry measurement apparatus, wherein it is in the form of a supple optical article, the article comprising a supple flexible support having a top face and a bottom face, the top face being covered with a reflective material in order to form an optical-reflection layer, a flexible heating element being disposed on at least one of the faces of the support.