Particle detector comprising at least: - one channel intended to receive at least one fluid comprising particles and configured to receive at least one light radiation (111a, 111b, 114a, 114b) emitted by a light source; - at least one photodetector network configured such that at least some of the photodetectors receive light beams emitted by the source and diffused by the particles present in the channel; in which - the detector further comprises at least one optical system configured to be passed through by at least some of the light beams after their diffusion by the particles and before they are received by the photodetectors, - each optical system is associated with a photodetector network and has an image focal plane, - the detector is configured such that said image focal plane of the optical system is optically coupled to the photodetector network, such that all the beams diffused by the particles along parallel directions before passing through the optical system reach, after passing through the optical system, one same point of the photodetector network associated with this optical system, - the at least one optical system is convergent, so as to make the light beams coming from the source and not diffused by the particles converge towards an image focus located on the image focal plane of the optical system, - said image focal plane of the optical system is optically coupled to the photodetector network, such that all the beams diffused by the particles along non-parallel directions before passing through the optical system reach, after passing through the optical system distinct points of the photodetector network associated with this optical system characterised in that the detector comprises a plurality of optical systems (15b, 15c,...), each optical system (15b, 15c,...) being associated with a photodetector network, the plurality of optical systems (15b, 15c,...) being disposed so as to extend around at least one part of the channel. - one channel intended to receive at least one fluid comprising particles and configured to receive at least one light radiation (111a, 111b, 114a, 114b) emitted by a light source; - at least one photodetector network configured such that at least some of the photodetectors receive light beams emitted by the source and diffused by the particles present in the channel; - the detector further comprises at least one optical system configured to be passed through by at least some of the light beams after their diffusion by the particles and before they are received by the photodetectors, - each optical system is associated with a photodetector network and has an image focal plane, - the detector is configured such that said image focal plane of the optical system is optically coupled to the photodetector network, such that all the beams diffused by the particles along parallel directions before passing through the optical system reach, after passing through the optical system, one same point of the photodetector network associated with this optical system, - the at least one optical system is convergent, so as to make the light beams coming from the source and not diffused by the particles converge towards an image focus located on the image focal plane of the optical system, - said image focal plane of the optical system is optically coupled to the photodetector network, such that all the beams diffused by the particles along non-parallel directions before passing through the optical system reach, after passing through the optical system distinct points of the photodetector network associated with this optical system characterised in that the detector comprises a plurality of optical systems (15b, 15c,...), each optical system (15b, 15c,...) being associated with a photodetector network, the plurality of optical systems (15b, 15c,...) being disposed so as to extend around at least one part of the channel.