Non-contact solid burning rate testing method

Abstract

The invention discloses a non-contact solid burning rate testing method. A burning detection part comprises an ignition device, a test piece burning carrying plate and a detection sensing area, wherein the ignition device comprises a solid igniter and a gas igniter; the test piece burning carrying plate is an impermeable non-burning flat plate with a low heat conducting coefficient; the detection sensing area comprises a light shielding cover, a light guide post and a light-sensitive sensor; the light-sensitive sensor is arranged in the light shielding cover; the light guide post is arranged in a fixing hole in the outer side of the light shielding cover, is over against the sensing window of the light-sensitive sensor and is vertical to a flame spreading direction. In the testing method, the conventional thermocouple is replaced by the light-sensitive sensor, and the light signal conduction range is controlled in combination with the structure of the light guide post, so that non-contact measurement of the solid burning rate is realized, the influence on the test piece burning state is avoided, burning distance errors are reduced, and the measuring accuracy is improved.

Description

technical field [0001] The invention relates to a method for testing the combustion rate of solids, in particular to a non-contact method for testing the combustion rate of solids. Background technique [0002] Combustion is a physical and chemical process in which combustibles are rapidly oxidized, releasing heat and producing visible flames. The burning rate refers to the rate at which combustibles are burned along the direction of flame spread, reflecting the amount of combustibles burned per unit time. The burning rate is an important index to measure the safety of combustible solids, and it is widely used in many fields such as industrial and mining industries, fireworks and firecrackers enterprises, and customs import quality inspection. The speed of burning depends on two aspects: one is the chemical reaction rate of combustibles and oxygen; the other is the contact mixing rate of oxygen and combustibles. The former is called the chemical reaction rate, also called ...

AI Technical Summary

Problems solved by technology

Because the thermocouple belongs to the contact temperature measuring instrument, when it is in contact with the sample during temperature measurement, it will affect the shape of the sample, disturb the temperature distribution field of the measured target, and then affect the measurement accuracy

And the thermocouple is susceptible to corrosion under some special working conditions, so the accuracy will decrease with time, and its response speed is slow, which will introduce measurement errors

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