Device for analyzing a polyphase mixture via a light beam backscattered by said mixture

A device for analyzing a polyphase mixture (2) via a light beam (3) backscattered by said mixture, comprising:

• a cell (1) having a capacity component of vertical extent, capable of containing the polyphase mixture,
• means (4) for emitting a light beam (5) in a direction of the cell, so that the light beam extends in a vertical plane (PV) covering at least a height (hc) of the cell containing the polyphase mixture (2),
• means (6) for receiving at least a part of the light beam (3) backscattered by said polyphase mixture, covering a backscattered light beam (3) height extending over the height (hc) of the cell containing the polyphase mixture (2),
• characterized in that the device further comprises:
• optical conjugation means (17) arranged between the cell (1) and the means (6) for receiving at least a part of the light beam (3) backscattered by the polyphase mixture (2),
• said receiver means (6) comprising a matrix sensor (20) provided with a plurality of pixels, forming a surface for receiving said at least part of the backscattered light beam, extending along a vertical direction and a horizontal direction,
• means (7) for analyzing said at least part of the light beam (3) backscattered by the polyphase mixture (2) and received by the matrix sensor (20) via the optical conjugation means (17),
• the light beam (5) emitted in the direction of the cell having, at an interface (9) between an inner surface (10) of a wall (18) of the cell (1) and the polyphase mixture (2), a vertical line shape (16) whose width is less, than a free transport path (1*) of the polyphase mixture (2).