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Single-pulse gas thermometry at low temperatures using two-photon laser-induced fluorescence in NO–N2 mixtures

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Abstract

A technique suitable for measuring fluctuating temperatures in supersonic turbulent flows of N2 seeded with NO has been demonstrated in a nonflowing cell. The method relies on the two-photon excitation of two selected rovibronic transitions in the NO γ(A2+, υ′ = 0 ← X2Π, υ″ = 0) band. Measurements between 155 and 295 K in N2 mixtures containing 300 parts in 106 NO were obtained with single-pulse errors below 4% rms.

© 1983 Optical Society of America

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