Abstract:

Long-term coal mining has led to a large number of waste piles spontaneous combusting in China. Mine ecological environment and social security issues are raised by accumulation of spontaneous combusting waste piles. The warning and monitoring of spontaneous combustion of surface temperature field of waste piles are the key issues to be solved. However，the distance detection is an important factor for temperature field of waste piles. Different distance detection experiments on temperature field of waste piles based on infrared thermal imager are designed to analyze the temperature measurement principle of infrared thermal imager and the impact of distance on the temperature measurement accuracy. The result shows that the optimal observation distance is from 13m to 18m based on infrared thermal imager to detect temperature field of waste piles. According to the experimental data, distance-temperature curve is fitted, error scale factor is extracted, the data is adjusted by error scale factor to improve accuracy. It provides important reference value to the use infrared thermal imager to detect surface temperature field of waste piles.

Key words: waste piles, temperature field, distance, temperature detection, mathematical model