Method for characterizing biological particles in aerosol form by laser-induced plasma spectrometry and associated system.

摘要

TITLE: Method for characterizing biological particles in aerosol form by laser-induced plasma spectrometry and associated system. The invention relates to a method for characterizing biological particles in the form of an aerosol, namely in suspension in an ambient gas, by laser-induced plasma spectrometry and an associated system. The process includes the following steps: a) sample ambient gas, which includes the biological particles that are to be characterized; b) generating a jet of said particles (JAB) in a vacuum chamber (CH); c) emitting a laser beam (FL) in the form of pulses and focusing said laser beam in said chamber (CH) under vacuum, transversely to a direction of propagation of the jet of particles (JP), to create, in a focal volume (VF), a plasma by the interaction between the laser beam (FL) and at most one individual particle (NP) of the jet, said plasma emitting other particles, characteristics of the interaction between the laser beam and said individual particle jet; d) collecting said particles emitted by the plasma; and e) performing a spectrometric analysis of these particles to finally characterize said biological particles. Figure for abstract: Fig. 1