Abstract

CH radical distributions in ethylene–air and methane–air diffusion flames are mapped by wavelength-modulation absorption spectroscopy (WMS). Tunable, wavelength-modulated 426-nm light is generated by frequency doubling of a modulated 852-nm distributed Bragg reflector diode laser. Absorbances of 5×10<sup>-5</sup> are measured with second-harmonic (2f) WMS with a signal-to-noise ratio of 3:1 in a 3-Hz measurement bandwidth. The feasibility of simultaneous line-of-sight absorption and spatially resolved laser-induced-fluorescence detection with a single excitation beam is also demonstrated. This near-UV source is suitable for microgravity drop-tower experiments and other applications in which compact, rugged, energy-efficient instrumentation is required.

© 1999 Optical Society of America

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J. Luque and D. R. Crosley, J. Chem. Phys. 104, 2146 (1996).

1995

1993

G. A. Raiche and J. B. Jeffries, Appl. Opt. 32, 4629 (1993).

D. B. Oh, A. C. Stanton, and J. A. Silver, J. Phys. Chem. 97, 2246 (1993).

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T. S. Norton and K. C. Smyth, Combust. Sci. Technol. 76, 1 (1991).

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N. L. Garland and D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1984).

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C. E. Moore and H. P. Broida, J. Res. Natl. Bur. Stand. Sect. A 63, 19 (1959).

Allen, M. G.

Bomse, D. S.

Broida, H. P.

C. E. Moore and H. P. Broida, J. Res. Natl. Bur. Stand. Sect. A 63, 19 (1959).

Copeland, R. A.

Crosley, D. R.

J. Luque and D. R. Crosley, J. Chem. Phys. 104, 2146 (1996).

N. L. Garland and D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1984).

N. L. Garland and D. R. Crosley, in 21st Symposium (International) on Combustion (Combustion Institute, Pittsburgh, Pa., 1986), p. 1693.

Dixon, G. J.

Dreyer, M. J.

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N. L. Garland and D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1984).

N. L. Garland and D. R. Crosley, in 21st Symposium (International) on Combustion (Combustion Institute, Pittsburgh, Pa., 1986), p. 1693.

Goldberg, L.

Greenberg, P. J.

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Howe, R. D.

Jeffries, J. B.

Kane, D. J.

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J. Luque and D. R. Crosley, J. Chem. Phys. 104, 2146 (1996).

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T. S. Norton and K. C. Smyth, Combust. Sci. Technol. 76, 1 (1991).

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D. B. Oh, A. C. Stanton, and J. A. Silver, J. Phys. Chem. 97, 2246 (1993).

Raiche, G. A.

Rensberger, K. J.

Silver, J. A.

Smyth, K. C.

T. S. Norton and K. C. Smyth, Combust. Sci. Technol. 76, 1 (1991).

Stanton, A. C.

D. B. Oh, A. C. Stanton, and J. A. Silver, J. Phys. Chem. 97, 2246 (1993).

D. S. Bomse, A. C. Stanton, and J. A. Silver, Appl. Opt. 31, 718 (1992).

Tanner, C. E.

Weiman, C. E.

Appl. Opt.

Combust. Sci. Technol.

T. S. Norton and K. C. Smyth, Combust. Sci. Technol. 76, 1 (1991).

J. Chem. Phys.

J. Luque and D. R. Crosley, J. Chem. Phys. 104, 2146 (1996).

J. Phys. Chem.

D. B. Oh, A. C. Stanton, and J. A. Silver, J. Phys. Chem. 97, 2246 (1993).

J. Quant. Spectrosc. Radiat. Transfer

N. L. Garland and D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1984).

J. Res. Natl. Bur. Stand. Sect. A

C. E. Moore and H. P. Broida, J. Res. Natl. Bur. Stand. Sect. A 63, 19 (1959).

Opt. Lett.

Other

N. L. Garland and D. R. Crosley, in 21st Symposium (International) on Combustion (Combustion Institute, Pittsburgh, Pa., 1986), p. 1693.

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