Particle magnifier and particle counter for particles in a flow

The present invention relates to a particle magnifier (1) for magnifying particles (2) carried by a carrier gas (3) in a flow (4), comprising a conditioner (14) for conditioning the flow (4) with a working gas (17), a cooler (15) for cooling the conditioned flow (4), and a first conduit (11) for guiding the flow (4) in a flow direction (6) successively through the conditioner (14) and the cooler (15), wherein the conditioner (14) has a second conduit (18) for the working gas (17), wherein the first and second conduit (11, 18) are in fluid communication via a membrane (19) that is permeable to both the carrier gas (3) and the working gas (17) and impermeable to the particles (2). The invention further relates to a particle counter (1') comprising the particle magnifier (1).