Abstract

A spectroradiometric pyrometer was developed to measure temperatures of shock-heated gases with time resolution of about 10 μsec. Gas temperatures in shock-heated CO2–N2 mixtures and in self-sustaining detonations were determined by simultaneously measuring infrared spectral radiance and absorptance at selected wavelengths in CO2 and H2O band spectra. By Kirchhoff’s law, the ratio (radiance/absorptance) equals the Planck blackbody radiance, from which the temperature is easily found. The measured temperatures agreed with values calculated from the measured shock velocities.

© 1966 Optical Society of America

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References

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  1. R. H. Tourin, in Temperature, Its Measurement and Control in Science and Industry, C. M. Herzfeld, ed. (Reinhold, New York, 1962), Vol. III, Part 2, Chap. 43.
  2. H. J. Babrov, J. Opt. Soc. Am. 51, 171 (1961).
    [CrossRef]
  3. A. G. Gaydon, I. R. Hurle, The Shock Tube in High-Temperature Chemical Physics (Reinhold, New York, 1962), pp. 37–39 and p. 113.
  4. H. J. Babrov, Ph.D. Thesis, University of Pittsburgh (1959); also available as AFOSR TR 59-207 (U.S. Air Force Office of Scientific Research, Washington, D. C., 1959).
  5. H. W. Emmons, ed., Fundamentals of Gas Dynamics, Vol. III of High Speed Aerodynamics and Jet Propulsion (Princeton Univ. Press, Princeton, N.J., 1958), pp. 574–686.
  6. R. H. Tourin, B. Krakow, Appl. Opt. 4, 237 (1965).
    [CrossRef]

1965

1961

Babrov, H. J.

H. J. Babrov, J. Opt. Soc. Am. 51, 171 (1961).
[CrossRef]

H. J. Babrov, Ph.D. Thesis, University of Pittsburgh (1959); also available as AFOSR TR 59-207 (U.S. Air Force Office of Scientific Research, Washington, D. C., 1959).

Gaydon, A. G.

A. G. Gaydon, I. R. Hurle, The Shock Tube in High-Temperature Chemical Physics (Reinhold, New York, 1962), pp. 37–39 and p. 113.

Hurle, I. R.

A. G. Gaydon, I. R. Hurle, The Shock Tube in High-Temperature Chemical Physics (Reinhold, New York, 1962), pp. 37–39 and p. 113.

Krakow, B.

Tourin, R. H.

R. H. Tourin, B. Krakow, Appl. Opt. 4, 237 (1965).
[CrossRef]

R. H. Tourin, in Temperature, Its Measurement and Control in Science and Industry, C. M. Herzfeld, ed. (Reinhold, New York, 1962), Vol. III, Part 2, Chap. 43.

Appl. Opt.

J. Opt. Soc. Am.

Other

A. G. Gaydon, I. R. Hurle, The Shock Tube in High-Temperature Chemical Physics (Reinhold, New York, 1962), pp. 37–39 and p. 113.

H. J. Babrov, Ph.D. Thesis, University of Pittsburgh (1959); also available as AFOSR TR 59-207 (U.S. Air Force Office of Scientific Research, Washington, D. C., 1959).

H. W. Emmons, ed., Fundamentals of Gas Dynamics, Vol. III of High Speed Aerodynamics and Jet Propulsion (Princeton Univ. Press, Princeton, N.J., 1958), pp. 574–686.

R. H. Tourin, in Temperature, Its Measurement and Control in Science and Industry, C. M. Herzfeld, ed. (Reinhold, New York, 1962), Vol. III, Part 2, Chap. 43.

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Figures (6)

Fig. 1
Fig. 1

Schematic diagram of the Warner & Swasey model 301 high-speed spectroradiometer.

Fig. 2
Fig. 2

Shock tube with high-speeds pectroradiometer at viewing section, covers removed.

Fig. 3
Fig. 3

Schematic diagram of electronic system used to amplify the emission and absorption signals.

Fig. 4
Fig. 4

Typical oscillogram of shock-heated CO2–N2 mixture obtained with high-speed spectroradiometer. Upper modulated trace shows the transmitted intensity, from which the spectral absorptance may be determined. Lower trace shows the sum of the transmitted and emitted intensities. Sweep rate 50 μsec/cm (laboratory time).

Fig. 5
Fig. 5

Typical oscillogram of infrared spectral radiance and absorptance of a gaseous detonation. Measurement made in 2.50 μ H2O band for a stoichiometric propane–oxygen mixture, initial pressure 1 atm.

Fig. 6
Fig. 6

Time-resolved temperature of stoichiometric propane–oxygen detonation wave at 1 atm initial pressure. Measurements made at 4.50 μ, 4.60 μ, and 4.80 μ.

Tables (2)

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Table I Incident Shock Temperatures in °K

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Table II Comparison of Experimental Results With Theory for Self-Sustaining Detonations

Equations (2)

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N λ ( T ) α λ ( T ) = N λ b ( T ) ,
N λ b ( T ) = c 1 λ - 5 π ( e c 2 / λ T - 1 ) - 1 ,

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