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 5×10-5 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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References

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1998 (1)

1996 (1)

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

1995 (1)

1993 (2)

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

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

1992 (1)

1991 (1)

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

1989 (1)

1988 (1)

1986 (1)

1984 (1)

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

1959 (1)

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

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).
[CrossRef]

Copeland, R. A.

Crosley, D. R.

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

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

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.

Garland, N. L.

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

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.

Hanson, R. K.

Howe, R. D.

Jeffries, J. B.

Kane, D. J.

Kliner, D. A. V.

Koplow, J. P.

Luque, J.

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

Moore, C. E.

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

Norton, T. S.

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

Oh, D. B.

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

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).
[CrossRef]

Stanton, A. C.

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

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

Tanner, C. E.

Weiman, C. E.

Appl. Opt. (5)

Combust. Sci. Technol. (1)

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

J. Chem. Phys. (1)

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

J. Phys. Chem. (1)

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

J. Quant. Spectrosc. Radiat. Transfer (1)

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

J. Res. Natl. Bur. Stand. Sect. A (1)

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

Opt. Lett. (2)

Other (1)

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

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Figures (4)

Fig. 1
Fig. 1

Experimental schematic for 426-nm beam generation and CH detection by WMS absorption and LIF in a slot burner. DBR, distributed Bragg reflector; PMT, photomultiplier tube.

Fig. 2
Fig. 2

Monitoring the R28 transition of the CH(0,  0) band of A Δ2X Π2 transition by (a) direct absorption, (b) 2f absorption, and (c) 2f LIF detection in an ethylene–air diffusion flame.

Fig. 3
Fig. 3

CH concentration distribution profiles for an ethylene–air diffusion flame and a methane–air diffusion flame at 2 and 4  mm above the burner surface.

Fig. 4
Fig. 4

2f absorption spectra of CH acquired perpendicular and parallel to the flame front.

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