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Single Particle Extinction and Scattering (SPES) is a technique in physics that is used to characterise micro and nanoparticles suspended in a fluid through two independent parameters, the diameter and the effective refractive index. A laser generates a gaussian beam which focuses inside a flow cell. A particle that passes through the focal region generates an interference in the beam, which is collected with a sensor. Through this signal it is possible to derive the real part and the imaginary part of the forward scattering field from each particle.

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  • Diffusione ed estinzione a singola particella (it)
  • Single particle extinction and scattering (en)
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  • Single Particle Extinction and Scattering (SPES) is a technique in physics that is used to characterise micro and nanoparticles suspended in a fluid through two independent parameters, the diameter and the effective refractive index. A laser generates a gaussian beam which focuses inside a flow cell. A particle that passes through the focal region generates an interference in the beam, which is collected with a sensor. Through this signal it is possible to derive the real part and the imaginary part of the forward scattering field from each particle. (en)
  • La Diffusione ed Estinzione a Singola Particella, comunemente indicata come SPES (dall'inglese Single Particle Extinction and Scattering), è una tecnica di diffusione ottica della luce che permette di caratterizzare singolarmente e nanoparticelle presenti in un fluido tramite l'acquisizione di due o più parametri indipendenti, generalmente il diametro sferico equivalente e l'indice di rifrazione efficace. La tecnica è stata sviluppata in due versioni, per misurazioni in aria e per misurazioni in liquido. (it)
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  • Single Particle Extinction and Scattering (SPES) is a technique in physics that is used to characterise micro and nanoparticles suspended in a fluid through two independent parameters, the diameter and the effective refractive index. A laser generates a gaussian beam which focuses inside a flow cell. A particle that passes through the focal region generates an interference in the beam, which is collected with a sensor. Through this signal it is possible to derive the real part and the imaginary part of the forward scattering field from each particle. The technique was developed to measure aerosols in air and particles in liquid. (en)
  • La Diffusione ed Estinzione a Singola Particella, comunemente indicata come SPES (dall'inglese Single Particle Extinction and Scattering), è una tecnica di diffusione ottica della luce che permette di caratterizzare singolarmente e nanoparticelle presenti in un fluido tramite l'acquisizione di due o più parametri indipendenti, generalmente il diametro sferico equivalente e l'indice di rifrazione efficace. Una sorgente laser genera un fascio gaussiano che viene fatto focalizzare all'interno di una cella di flusso, nella quale scorre il fluido con le particelle da analizzare. Un sensore posto in linea con il fascio misura l'interferenza del campo scatterato per ogni singolo evento. La tecnica è stata sviluppata in due versioni, per misurazioni in aria e per misurazioni in liquido. (it)
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