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arXiv · 1602.00129

Rapid, broadband spectroscopic temperature measurement of CO2 using VIPA spectroscopy

Andrew Klose·Gabriel Ycas·Flavio C. Cruz·Daniel L. Maser·Scott A. Diddams
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Abstract

Time-resolved spectroscopic temperature measurements of a sealed carbon dioxide sample cell were realized with an optical frequency comb combined with a two-dimensional dispersive spectrometer. A supercontinuum laser source based on an erbium fiber mode-locked laser was employed to generate coherent light around 2000 nm (5000 cm-1). The laser was passed through a 12-cm long cell containing CO2, and the transmitted light was analyzed in a virtually imaged phased array- (VIPA-) based spectrometer. Broadband spectra spanning more than 100 cm-1 with a spectral resolution of roughly 0.075 cm-1 (2.2 GHz) were acquired with an integration period of 2 ms. The temperature of the CO2 sample was deduced from fitting a modeled spectrum to the line intensities of the experimentally acquired spectrum. Temperature dynamics on the time scale of milliseconds were observed with a temperature resolution of 2.6 K. The spectroscopically-deduced temperatures agreed with temperatures of the sample cell measured with a thermistor. Potential applications of this technique include quantitative measurement of carbon dioxide concentration and temperature dynamics in gas-phase chemical reactions (e.g., combustion), and plasma diagnostics.

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Andrew Klose, Gabriel Ycas, Flavio C. Cruz, Daniel L. Maser, Scott A. Diddams. 2016-01-30. Rapid, broadband spectroscopic temperature measurement of CO2 using VIPA spectroscopy. https://doi.org/10.1007/s00340-016-6349-4

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