Abstract

A new design for generating CARS signals and for the detection and processing of these signals is presented and evaluated. The design is based on electronic heterodyning of the CARS spectrum of nitrogen at two selected narrowband frequencies, ratioing the resulting signal strengths, and comparing this ratio with a theoretically derived temperature scale. A reference cell is incorporated into the design for system calibration and for accurate temperature measurements. The spectrometer is found capable of measuring temperature in the submillisecond time scale with an accuracy of 10% in the 1000–2000 K temperature range. A typical result using the Hg_xCd_1−xTe photomixer for T = 1500 K, ΔT = 50 K is a SNR of 21 dB and a data collection rate of 300 Hz.

© 1989 Optical Society of America

Rotational CARS: a comparison of different techniques with emphasis on accuracy in temperature determination

Marcus Aldén, Per-Erik Bengtsson, Hans Edner, Stefan Kröll, and David Nilsson
Appl. Opt. 28(15) 3206-3219 (1989)

Effect of detector nonlinearity and image persistence on CARS derived temperatures

D. R. Snelling, G. J. Smallwood, and T. Parameswaran
Appl. Opt. 28(15) 3233-3241 (1989)

Comparison between CARS and corrected thermocouple temperature measurements in a diffusion flame

R. L. Farrow, P. L. Mattern, and L. A. Rahn
Appl. Opt. 21(17) 3119-3125 (1982)

Annular phase-matched dual-pump coherent anti-Stokes Raman spectroscopy system for the simultaneous detection of nitrogen and methane

Stephen M. Green, Paul J. Rubas, Mark A. Paul, James E. Peters, and Robert P. Lucht
Appl. Opt. 37(9) 1690-1701 (1998)

Simultaneous temperature and sensitive two-species concentration measurements by single-shot CARS

Michel Pealat, P. Magre, P. Bouchardy, and G. Collin
Appl. Opt. 30(10) 1263-1273 (1991)