Abstract

Water vapor absorption at 161 wavelengths, from 9.2 to 11.9 μm, of the 12C16O2, 13C16O2, and 14C16O2 lasers was measured using a resonant optoacoustic spectrometer. Results were obtained at several precisely determined vapor concentrations in a flow of pure air at a total pressure of 1 atm. Since the same apparatus and methodology were used for all measurements, a reliable assessment can be made of the relative merits of the three lasers in applications such as atmospheric propagation and ranging.

© 1983 Optical Society of America

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References

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1982 (1)

1980 (1)

1979 (1)

1978 (3)

1976 (1)

1974 (1)

L. Rosengren, E. Max, S. T. Eng, J. Sci. Instrum. 7, 125 (1974).
[CrossRef]

1971 (1)

L. B. Kreuzer, J. Appl. Phys. 42, 2934 (1971).
[CrossRef]

1969 (1)

Beebe, C. H.

R. A. Weagant, C. H. Beebe, “Laser Optoacoustic Explosives Detection,” Final Report, Beckman Instruments, Inc. (1977).

Chen, T. S.

Damon, E. K.

Eng, S. T.

Fischer, G.

Hubert, M. H.

M. H. Hubert, “Development of a Laser Optoacoustic Trace Gas Analyzer,” Ultra Lasertech, Inc., Report 80-701 (July1981).

Johansson, J.

Kassner, J. L.

Kreuzer, L. B.

L. B. Kreuzer, J. Appl. Phys. 42, 2934 (1971).
[CrossRef]

Kritchman, E. M.

Long, R. K.

Margolis, J. S.

Marthinsson, B.

Max, E.

L. Rosengren, E. Max, S. T. Eng, J. Sci. Instrum. 7, 125 (1974).
[CrossRef]

McCoy, J. H.

Menzies, R. T.

Nordstrom, R. J.

Persson, U.

Peterson, J. C.

Rensch, D. B.

Rosengren, L.

L. Rosengren, E. Max, S. T. Eng, J. Sci. Instrum. 7, 125 (1974).
[CrossRef]

Rosengren, L.-G.

Schnell, W.

Shtrikman, S.

Shumate, M. S.

Slatkine, M.

Suck, S. H.

Thomas, M. E.

Weagant, R. A.

R. A. Weagant, C. H. Beebe, “Laser Optoacoustic Explosives Detection,” Final Report, Beckman Instruments, Inc. (1977).

Wetmore, A. E.

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Figures (4)

Fig. 1
Fig. 1

Experimental setup for laser optoacoustic measurement of water vapor absorption: G, grating; D, optical detector; AMP, amplifier; STAB, stabilizer; PZT, piezoelectric translator; C, chopper; M, mirror; A, attenuator; T, telescope; I, iris diaphragm; S, spectrophone; MIC, microphone; F/M, flowmeter; RH, relative humidity probe; T, thermistor; M/S, molecular sieve.

Fig. 2
Fig. 2

Water vapor absorption characteristics at 14C16O2 laser wavelengths.

Fig. 3
Fig. 3

Water vapor absorption characteristics at 13C16O2 laser wavelengths.

Fig. 4
Fig. 4

Water vapor absorption characteristics at 12C16O2 laser wavelengths.

Tables (6)

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Table I Absorption Coefficients of Water Vapor in I-Band of 14C16O2 Laser

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Table II Curve-Fit Coefficients for Water Vapor Absorption Data

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Table III Absorption Coefficients of Water Vapor in I-Band of 13C16O2 Laser

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Table IV Absorption Coefficients of Water Vapor in II-Band of 13C16O2 Laser

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Table V Absorption Coefficients of Water Vapor in I-Band of 12C16O2 Laser

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Table VI Absorption Coefficients of Water Vapor in II-Band of 12C16O2 Laser

Equations (5)

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R = e I α = e I α ˜ p ,
p = ( n R T ) / V ,
α ( λ ) = A p + B p 2 ,
α { R ( 20 ) I } = 1.11 × 10 1 p km 1 , ( 4 ) α { R ( 20 ) I } = 5.53 × 10 2 p km 1 ( present work ) .
α { P ( 20 ) I } = 7.0 × 10 6 p { P + 88 p } km 1 , ( 4 ) α { P ( 20 ) I } = 1.64 × 10 6 p { P + 152 p } km 1 ( present work ) .

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