ABSTRACT: A fireworks flame generally contains many solid or liquid particles, which cause a continuous spectrum. In order to apply the linereversal method of temperature measurement to such flames, the author introduced a theoretical equation, which denotes the ratio of the intensity of the resonance lines to that of the neighboring part of the spectrum when a standard light beam is introduced into the spectroscope through the flame. This equation shows very clearly that as long as the flame does not contain so many particles that it prevents the standard light beam from permeating the flame, the line-reversal method is always effective. Using this equation, the author proposes a method of measuring flame temperatures that are higher than the maximum brightness temperature of the standard light. The author applied this method to two examples of hightemperature fireworks flames of some magnesium powder compositions and obtained the temperatures of 3,159 and 3,214 K.
Ref: Selected Pyrotechnic Publication of Dr. Takeo Shimizu, Part 3, pp 1-14
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