Fourier transform infrared spectrometer for a single aerosol particle

Gideon Sageev Grader, Richard C. Flagan, John H. Seinfeld, Stephen Arnold

Research output: Contribution to journalArticle

Abstract

A spectrometer is reported here for obtaining the infrared spectrum of a single aqueous aerosol particle by a Fourier transform technique. The particle is held in an electrodynamic balance and irradiated simultaneously by the infrared output from a Michelson interferometer and the visible light from a dye laser. The size of the particle is modulated by chopping the IR beam, and the resulting visible scattered light fluctuation is detected at 90° with a photomultiplier tube. The amplitude of the scattered light fluctuation is measured with a lock-in amplifier at each interferometer mirror position. The electronic circuitry for stepping the interferometer mirror is presented and discussed. Inverting the lock-in signal by a discrete fast Fourier transform routine (FFT) yields the particle absorption spectrum. The resulting spectrum for an (NH4)2SO4 droplet is presented.

Original languageEnglish (US)
Pages (from-to)584-587
Number of pages4
JournalReview of Scientific Instruments
Volume58
Issue number4
DOIs
StatePublished - 1987

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Infrared spectrometers
infrared spectrometers
Particles (particulate matter)
Aerosols
aerosols
Fourier transforms
Interferometers
Mirrors
interferometers
mirrors
Infrared radiation
Michelson interferometers
Light amplifiers
Dye lasers
Photomultipliers
Electrodynamics
photomultiplier tubes
Discrete Fourier transforms
electrodynamics
dye lasers

ASJC Scopus subject areas

  • Instrumentation
  • Physics and Astronomy (miscellaneous)

Cite this

Fourier transform infrared spectrometer for a single aerosol particle. / Grader, Gideon Sageev; Flagan, Richard C.; Seinfeld, John H.; Arnold, Stephen.

In: Review of Scientific Instruments, Vol. 58, No. 4, 1987, p. 584-587.

Research output: Contribution to journalArticle

Grader, Gideon Sageev ; Flagan, Richard C. ; Seinfeld, John H. ; Arnold, Stephen. / Fourier transform infrared spectrometer for a single aerosol particle. In: Review of Scientific Instruments. 1987 ; Vol. 58, No. 4. pp. 584-587.
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