Photoacoustic detecting device for measuring a parameter of interest in a medium

A photoacoustic detecting device (1) for measuring a parameter of interest in a medium (M) comprising:

• a housing (7) formed by a baseplate (72) and a cover,
• a light source (2), configured to emit a light signal,
• a photoacoustic cell (9) comprising a hollow contact surface (91) intended to be in contact with the medium (M), where the light signal is able to propagate in the photoacoustic cell (9) and pass through the hollow contact surface (91) to reach the medium (M),
• a guiding structure (8), configured to direct the light signal toward the photoacoustic cell (9),
• a transducer (3) assembled to the photoacoustic cell (9) and configured to detect a generated signal, where the generated signal is generated in the photoacoustic cell (9) by a photothermic effect in the medium (M) in response to an irradiation of the medium (M) by the light signal,
• one or more maintaining element(s)—(100) configured to assemble the light source (2), the transducer (3), the photoacoustic cell (9) and said guiding element (8) in a single building block,
• said single building block is provided in the housing (7) such that the hollow contact surface (91) of the photoacoustic cell (9) emerges out of an aperture (721) of the baseplate (72),
• wherein
• the single building block is freely received in the housing (7), and in that
• the detecting device (1) comprises elastic components (110, 120), configured to elastically deform under the effect of a movement of the single building block relatively to the housing (7).