Simple, Versatile, Pseudo “Double Beam” Photoacoustic Spectrometer
作者:
M.Le Liboux,
R. Nahoum,
C. Pichon,
V. Plichon,
期刊:
Analytical Letters
(Taylor Available online 1984)
卷期:
Volume 17,
issue 19
页码: 2227-2241
ISSN:0003-2719
年代: 1984
DOI:10.1080/00032718408065370
出版商: Taylor & Francis Group
关键词: Photoacoustic spectrometer.
数据来源: Taylor
摘要:
We describe in this paper a “pseudo-double beam” photoacoustic spectrometer using a wide aperture monochromator (F/2) and a very sensitive cell. The double signals required to get the normalized value, i.e., the sample signal and a carbon black reference signal, are obtained by a slow (1.7 Hz) alternating movement of the two cells support, the sample and the reference being alternately placed at the focus point of the beam which is fixed in space and time. The modulation of the light flux is independently ensured by a mechanical chopper. Such an original device associates good performances in resolution (0.7 nm), signal-to-noise ratio (1200 for HO2O3at 450 nm with a 5 nm bandwidth) and normalization in a wide spectral range.
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