Rapid, broadband spectroscopic temperature measurement of CO2 using VIPA spectroscopy
Andrew M. Klose, Gabriel Ycas, Flavio Caldas da Cruz, Daniel I. Maser, Scott Diddams
Rapid 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 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 time 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.
, Ycas, G.
, Caldas da Cruz, F.
, Maser, D.
and Diddams, S.
Rapid, broadband spectroscopic temperature measurement of CO<sub>2</sub> using VIPA spectroscopy, Applied Physics B, [online], https://doi.org/10.1007/s00340-016-6349-4, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=919135
(Accessed November 29, 2023)