Abstract

An infrared (IR) emission cell which is capable of operation up to 1500°C is described. The cell is based on an atomic absorption graphite furnace and is coupled to a Fourier transform infrared spectrometer. The spectrometer has been used to measure the emission spectrum of quartz from 200 to 1400°C, and the changes in the spectrum occurring with temperature can be related to the formation of cristobalite; transitions between low and high forms (alpha and beta forms) can also be monitored. Aragonite has also been analyzed through the temperature range 100 to 600°C, and the aragonite/calcite transition is clearly evident. The transformation of kaolinite to metakaolinite and through to mullite and cristobalite has also been studied with this <i>in situ</i> technique. The formation of mullite is evident in the spectrum at temperatures as low as 900°C, and the formation of cristobalite is clearly seen at 1200°C.

Recognition of coal from other minerals in powder form using terahertz spectroscopy

Jingjing Deng, Jan Ornik, Kai Zhao, Enjie Ding, Martin Koch, and Enrique Castro-Camus
Opt. Express 28(21) 30943-30951 (2020)

Microscopic emission and reflectance thermal infrared spectroscopy: instrumentation for quantitative in situ mineralogy of complex planetary surfaces

C. S. Edwards and P. R. Christensen
Appl. Opt. 52(11) 2200-2217 (2013)

Correcting thermal-emission-induced detector saturation in infrared spectroscopy

Chunhui Yao, Hongyan Mei, Yuzhe Xiao, Alireza Shahsafi, William Derdeyn, Jonathan L. King, Chenghao Wan, Raluca O. Scarlat, Mark H. Anderson, and Mikhail A. Kats
Opt. Express 30(21) 38458-38467 (2022)

Analysis of aircraft exhausts with Fourier-transform infrared emission spectroscopy

Jörg Heland and Klaus Schäfer
Appl. Opt. 36(21) 4922-4931 (1997)

High temperature Fourier transform photoacoustic spectroscopy: sample emission effects

S. McGovern, B. S. H. Royce, and J. Benziger
Appl. Opt. 24(10) 1512-1514 (1985)