Measuring vessel for spectrometry measurement apparatus

A breathalyzer for measuring the partial gas level exhaled by a breath fluid, said breathalyzer comprising:

• a device emitting infrared radiation, an infrared receiver and a measuring vessel in which the breath fluid flows, the measuring vessel being in the form of a hollow tube provided with a reflective material forming an optical-reflection layer, wherein that said vessel includes:
• a hollow tube comprising an internal surface,
• the hollow tube being produced from a non-metallic material,
• a removable supple optical article being applied against the internal surface of the hollow tube, said article comprising a supple flexible support,
• the supple flexible support comprises a top face and a bottom face that are opposite each other,
• the top face of said support being covered with a reflective metal material,
• the bottom face of said support being in contact with the internal surface of the hollow tube, and
• the removable supple optical article being inserted in the hollow tube so that the reflective metal material forms the optical-reflection layer.

A method for manufacturing 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, characterized by the fact that the method comprising:

• i) producing the hollow tube from a non-metallic material, the hollow tube being formed with an internal surface;
• and
• ii) applying against the internal surface of the hollow tube:
• a removable supple optical article, said article comprising a supple flexible support comprising a top face and a bottom face that are opposite each other,
• iii) covering the top face of said support with a reflective metal material,
• iV) positioning said article in said tube so that:
• the bottom face of said support being in contact with the internal surface of the hollow tube,
• the reflective metal material of said article forms the optical-reflection layer.