Sensor for spectrometric analysis of a variable-pressure gaseous fuel for automotive vehicle

A sensor for spectrometric analysis of a variable-pressure gaseous fuel for an automotive vehicle, said sensor, comprising:

• a body comprising a conduit for the flow of the variable-pressure gaseous fuel;
• a transmitter of an optical flow;
• a sliding guide tube for said optical flow, comprising a proximal end coupled to the transmitter and a distal end comprising a first window opening into the flow conduit and configured to allow the passage of the optical flow;
• a second window positioned facing the first window so as to allow the optical flow to pass through the flow conduit;
• a receiver of said optical flow, configured to receive and analyze the optical flow received through the second window;
• and
• a channel for sampling variable-pressure gaseous fuel from the flow conduit,
• wherein the sliding guide tube is movable responsive to variable-pressure gaseous fuel sampled from the flow conduit via the sampling channel such that a distance between the first window and the second window changes on the basis of a pressure variation of the variable-pressure gaseous fuel flowing in the flow conduit,
• said sliding guide tube comprising a driving element comprising a second ring fixed to the sliding guide tube and extending radially from the outer wall of the sliding guide tube, and a compression spring fitted around the sliding guide tube configured to urge against the driving element, and
• wherein the second ring delimits, on a first side, a receiving space for variable-pressure gaseous fuel, and on an opposite second side, an expansion space in which the compression spring is located.