A high-temperature high-pressure optical cell for general-purpose spectrometers designed for supercritical water experiments

Citation
F. Amita et al., A high-temperature high-pressure optical cell for general-purpose spectrometers designed for supercritical water experiments, REV SCI INS, 72(9), 2001, pp. 3605-3609
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
REVIEW OF SCIENTIFIC INSTRUMENTS
ISSN journal
0034-6748 → ACNP
Volume
72
Issue
9
Year of publication
2001
Pages
3605 - 3609
Database
ISI
SICI code
0034-6748(200109)72:9<3605:AHHOCF>2.0.ZU;2-8
Abstract
We have developed a compact size high-temperature high-pressure optical cel l that can be mounted on a commercially available general-purpose spectrome ter. A small electric furnace heats the high-pressure optical cell while a water-cooled thermal shielding jacket protects the spectrometer. This cooli ng device works quite effectively to eliminate undesirable heating of spect rometer optics and thus makes it possible to take spectra at temperatures u p to 600 degreesC with an ordinary spectrometer. The optical cell is made o f Hastelloy-X and equipped with two optical windows of synthetic sapphire. The length and the diameter of the optical path are 10 and 6 mm, respective ly. As the optical cell is combined with a flow system, which allows the qu ick replacement of the sample solution with the reference water, the refere nce signal can be taken immediately after the measurement of the sample sig nal. The developed cell can be operated up to 60 MPa and 600 degreesC witho ut any special modification to the spectrometer. The NiBr2 absorption spect ra were taken under the supercritical water condition to demonstrate the ef ficiency of the optical cell. (C) 2001 American Institute of Physics.