基于匹配法的不同种类煤矸石发射率预测研究
Research on emissivity prediction of different coal gangue types based on matching method
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摘要: 精准的发射率参数设置对红外仪测温及煤矸石红外图像的识别至关重要。针对红外热像仪在“液体介入+红外检测”煤矸识别方法中的准确应用,在红外热像仪检测煤矸石之前,其自身的发射率需与煤矸石的发射率保持一致性,方可保证测试结果的准确性,本文基于红外热像仪和表面热电偶相结合的匹配法,搭建了匹配法测量煤矸石发射率的实验平台与装置,进行了不同温度条件下煤矸石发射率特征提取实验。实验结果表明,不同温度条件下煤矸石表面粗糙度是影响煤矸石自身发射率差异的内在因素;煤矸石的发射率随样品温度的增大呈幂函数降低趋势,给出了不同种类煤矸石发射率与温度的关系式,预测了室温下的发射率值,且采用反代法验证了匹配法测试结果的准确性,发现实测值误差值随发射率的增大而减小,研究结果可为基于红外图像的煤矸识别技术提供支撑。Abstract: Accurate emissivity parameter settings are crucial for infrared temperature measurement and for infrared image recognition of coal and gangue. Aiming at the accurate application of infrared thermal imager in the “liquid intervention + infrared detection” coal/gangue recognition method, before the infrared thermal imager detects coal and gangue, its own emissivity needs to be consistent with the emissivity of coal and gangue to ensure the accuracy of the test results. Based on the matching method of infrared thermal imager and surface thermocouple, this article builds an experimental platform and device for measuring the emissivity of coal and gangue by matching method, and carries out the extraction experiment of coal and gangue emissivity features under different temperature conditions. The experimental results show that the surface roughness of coal and gangue under different temperature conditions constitutes an internal factor influencing the emissivity difference of coal and gangue itself. The emissivity of coal and gangue decreases with the increase of sample temperature,following a power function. The relationship between emissivity and temperature of different kinds of coal and gangue is presented, and the emissivity value at room temperature is predicted. The accuracy of the test results of the matching method is verified through the application of the inverse method. It is observed that the error value of the measured value decreases with the increase of emissivity. These research findings can offer valuable support for coal/gangue recognition technology based on infrared imaging.
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