Particle analysis method and apparatus for a spectrometry-based particle analysis

A particle analysis apparatus, being configured for a spectrometry-based analysis of a fluid sample comprising a sheath fluid and at least one particle to be analyzed, comprising

• a light source device being configured for creating a sample light beam and a probe light beam,
• a phase modulator device being configured for periodically varying a mutual relative phase between the sample light beam and the probe light beams,
• at least one sample channel being arranged for accommodating a flow of the fluid sample and for irradiating the fluid sample with the sample light beam, so that the at least one particle is irradiated for a predetermined irradiation period, and
• a detector device being configured for detecting the sample light beam and the probe light beam and providing a spectral response of the at least one particle, wherein
• the light source device comprises at least one broadband source, which has an emission spectrum covering a mid-infrared (MIR) frequency range, and
• the phase modulator device is configured for varying the mutual relative phase with a scanning period equal to or below the irradiation period of irradiating the particles.