Fourier transform infrared spectrometer for a single aerosol particle
作者:
Gideon Sageev Grader,
Richard C. Flagan,
John H. Seinfeld,
Stephen Arnold,
期刊:
Review of Scientific Instruments
(AIP Available online 1987)
卷期:
Volume 58,
issue 4
页码: 584-587
ISSN:0034-6748
年代: 1987
DOI:10.1063/1.1139220
出版商: AIP
数据来源: AIP
摘要:
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)2SO4droplet is presented.
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