Abstract

A method for imaging the reaction zones in hydrocarbon–air flames is described. The technique is based on planar laser-induced fluorescence of the CH radical by use of excitation in the A2Δ ← X2II(1, 0) band and broadband detection from the overlapping (1, 1) and (0, 0) bands. This strategy is found to provide a significant improvement in image quality compared with that from previously employed CH imaging techniques. Results are presented for propane–air flames, and a comparison of possible imaging strategies is given.

© 1994 Optical Society of America

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References

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  1. R. S. Barlow, R. W. Dibble, J.-Y. Chen, R. P. Lucht, Combust. Flame 82, 235 (1990).
    [CrossRef]
  2. M. J. Dyer, D. R. Crosley, in Proceedings of the International Conference on Lasers ‘84, K. M. Corcoran, D. M. Sullivan, W. C. Stwalley, eds. (STS, McLean, Va., 1985), p. 211.
  3. M. G. Allen, R. D. Howe, R. K. Hanson, Opt. Lett. 11, 126 (1986).
    [CrossRef] [PubMed]
  4. M. Namazian, R. L. Schmitt, M. B. Long, Appl. Opt. 27, 3597 (1986).
    [CrossRef]
  5. N. L. Garland, D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1985); Appl. Opt. 24, 4229 (1985); P. F. Bernath, C. R. Brazier, T. Olsen, R. Hailey, W. T. M. L. Fernando, J. Mol. Spectrosc. 147, 16 (1991).
    [CrossRef] [PubMed]

1990 (1)

R. S. Barlow, R. W. Dibble, J.-Y. Chen, R. P. Lucht, Combust. Flame 82, 235 (1990).
[CrossRef]

1986 (2)

1985 (1)

N. L. Garland, D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1985); Appl. Opt. 24, 4229 (1985); P. F. Bernath, C. R. Brazier, T. Olsen, R. Hailey, W. T. M. L. Fernando, J. Mol. Spectrosc. 147, 16 (1991).
[CrossRef] [PubMed]

Allen, M. G.

Barlow, R. S.

R. S. Barlow, R. W. Dibble, J.-Y. Chen, R. P. Lucht, Combust. Flame 82, 235 (1990).
[CrossRef]

Chen, J.-Y.

R. S. Barlow, R. W. Dibble, J.-Y. Chen, R. P. Lucht, Combust. Flame 82, 235 (1990).
[CrossRef]

Crosley, D. R.

N. L. Garland, D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1985); Appl. Opt. 24, 4229 (1985); P. F. Bernath, C. R. Brazier, T. Olsen, R. Hailey, W. T. M. L. Fernando, J. Mol. Spectrosc. 147, 16 (1991).
[CrossRef] [PubMed]

M. J. Dyer, D. R. Crosley, in Proceedings of the International Conference on Lasers ‘84, K. M. Corcoran, D. M. Sullivan, W. C. Stwalley, eds. (STS, McLean, Va., 1985), p. 211.

Dibble, R. W.

R. S. Barlow, R. W. Dibble, J.-Y. Chen, R. P. Lucht, Combust. Flame 82, 235 (1990).
[CrossRef]

Dyer, M. J.

M. J. Dyer, D. R. Crosley, in Proceedings of the International Conference on Lasers ‘84, K. M. Corcoran, D. M. Sullivan, W. C. Stwalley, eds. (STS, McLean, Va., 1985), p. 211.

Garland, N. L.

N. L. Garland, D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1985); Appl. Opt. 24, 4229 (1985); P. F. Bernath, C. R. Brazier, T. Olsen, R. Hailey, W. T. M. L. Fernando, J. Mol. Spectrosc. 147, 16 (1991).
[CrossRef] [PubMed]

Hanson, R. K.

Howe, R. D.

Long, M. B.

Lucht, R. P.

R. S. Barlow, R. W. Dibble, J.-Y. Chen, R. P. Lucht, Combust. Flame 82, 235 (1990).
[CrossRef]

Namazian, M.

Schmitt, R. L.

Appl. Opt. (1)

Combust. Flame (1)

R. S. Barlow, R. W. Dibble, J.-Y. Chen, R. P. Lucht, Combust. Flame 82, 235 (1990).
[CrossRef]

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

N. L. Garland, D. R. Crosley, J. Quant. Spectrosc. Radiat. Transfer 33, 591 (1985); Appl. Opt. 24, 4229 (1985); P. F. Bernath, C. R. Brazier, T. Olsen, R. Hailey, W. T. M. L. Fernando, J. Mol. Spectrosc. 147, 16 (1991).
[CrossRef] [PubMed]

Opt. Lett. (1)

Other (1)

M. J. Dyer, D. R. Crosley, in Proceedings of the International Conference on Lasers ‘84, K. M. Corcoran, D. M. Sullivan, W. C. Stwalley, eds. (STS, McLean, Va., 1985), p. 211.

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Figures (1)

Fig. 1
Fig. 1

Left, Time-averaged image of the natural emission and right, PLIF image of CH obtained by use of (1, 0) band excitation and combined (0, 0) and (1, 1) band detection taken in a premixed propane–air flame. The field of view is 8.2 mm × 21 mm.

Tables (1)

Tables Icon

Table 1 Comparison of the CH PLIF Imaging Strategies

Equations (4)

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S f = hlw Ω 4 π IB Δ ν L g a f B n CH Q ( 1 + I / I sat ) ( τ L + 1 / Q ) i ( A i t Di ) ,
I E L / n p hw Δ ν L τ L .
I sat K ( f B , R ) Q / B ,
N r E L Δ ν L Bg a / n p hw .

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