Abstract

<p>A new method for flame temperature measurement has been developed involving measurement of radiation, emitted by flames, in a narrow wavelength interval within the ultraviolet OH emission band. The mean value of flame emissivity within the wavelength interval is evaluated by measurement of mean flame transmission for a continuous spectrum source. The method requires that the wavelength interval studied be so narrow that the emission of the source used for transmission measurement and that of a blackbody at flame temperature both be approximately constant over the interval.</p><p>The method has been tested on steady flames over temperature ranges from 2000°K to 3000°K and excellent agreement obtained with sodium line reversal measurements. Temperatures of pulsed flames have been determined from photographic traces obtained with a monochromator-photo-multiplier-oscilloscope-camera combination. Two high speed light choppers were used, one to interrupt the radiations entering the monochromator and the other to interrupt, at a different frequency, the radiations from a hydrogen discharge lamp transmitted by the flame to the monochromator. The time resolution was 0.10 millisecond and the accuracy in temperature measurement about 40°K in the range 2000°K to 3000°K. The method was calibrated by means of sodium line reversal although it is easily adaptable to absolute calibration.</p>

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References

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  1. G. H. Dieke and H. M. Crosswhite, "The Ultra-Violet Bands of OH," Bumble-bee Report No. 87, (Nov. 1948).
  2. H. G. Wolfhard and W. G. Parker, "Combustion Processes in Flames, Part VI," Royal Aircraft Establishment; Report No: Chem 457, (March 1949).
  3. Supplied by National Technical Laboratories for use in the Beckman Spectrophotometer.

Crosswhite, H. M.

G. H. Dieke and H. M. Crosswhite, "The Ultra-Violet Bands of OH," Bumble-bee Report No. 87, (Nov. 1948).

Dieke, G. H.

G. H. Dieke and H. M. Crosswhite, "The Ultra-Violet Bands of OH," Bumble-bee Report No. 87, (Nov. 1948).

Parker, W. G.

H. G. Wolfhard and W. G. Parker, "Combustion Processes in Flames, Part VI," Royal Aircraft Establishment; Report No: Chem 457, (March 1949).

Wolfhard, H. G.

H. G. Wolfhard and W. G. Parker, "Combustion Processes in Flames, Part VI," Royal Aircraft Establishment; Report No: Chem 457, (March 1949).

Other (3)

G. H. Dieke and H. M. Crosswhite, "The Ultra-Violet Bands of OH," Bumble-bee Report No. 87, (Nov. 1948).

H. G. Wolfhard and W. G. Parker, "Combustion Processes in Flames, Part VI," Royal Aircraft Establishment; Report No: Chem 457, (March 1949).

Supplied by National Technical Laboratories for use in the Beckman Spectrophotometer.

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