NONLINEARITY AND SINGLE SHOT NOISE PROBLEMS IN CARS SPECTROSCOPY

Authors
  1. Snelling, D.R.
  2. Smallwood, G.J.
  3. Sawchuk, R.A.
  4. Parameswaran, T.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN);Roy Ball Associates Ltd, Ottawa ONT (CAN)
Abstract
The paper describes the design and operation of a CARS spectrometer and its use to perform accurate temperature measurements in a simple laboratory flat-flame burner. Instrumental sources of systematic error and noise in CARS temperature measurements are discussed. An analysis of the system noise is presented and the use of the measured noise to perform weighted least mean squares fits of experimental and theoretical CARS spectra is discussed. The use of a weighted fit is shown to markedly improve the precision of single pulse CARS temperature measurements. Finally, the incorporation of some recent advances in CARS theory which have resulted in more computationally efficient algorithms for calculating theoretical CARS spectra and their effect on the accuracy of temperature measurements are discussed.
Report Number
AGARD-CP-399-PAP-4 — @Paper presented at the AGARD Propulsion and Energetics Panel 67th Symposium, Philadelphia, Pennsylvania, US, 19-23 May 1986; CONTAINED IN 87-01220
Date of publication
15 Nov 1986
Number of Pages
19
DSTKIM No
87-01216
CANDIS No
50057
Format(s):
Hardcopy

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