煤岩自动测试中图像质量对镜质体反射率测定的影响研究

Research on the influence of image quality on the vitrinite reflectance determination during coal petrology test

针对煤岩显微图像自动采集中不清晰的显微图像是否影响镜质体随机反射率的最终测值该问题,从焦距偏离、入射光强度以及煤的变质程度等方面研究图像质量对镜质体反射率测定的影响。研究表明:不同光照强度下,不同变质程度煤的近物镜端与远离物镜端焦距偏离均会导致镜质体反射率偏低,且偏低值相当;当焦距偏离2μm以上时,煤岩自动测试采集的图像中镜质体测试精度不能满足国家标准测试方法的准确度要求。对焦距偏离2μm以内时所采集图像质量的影响,还应针对不同变质程度的煤及不同的光照强度等进行进一步的实验研究。

The influence of image quality on the random reflectance determination of vitrinite during the process of automatic image acquisition was researched in this paper from some aspects such as focal length deviation,intensity of incident light and degree of metamorphism.It was shown that the focal length deviation of both near and far to the objective under the condition of different intensity of illumination and different degree of metamorphism can lead to a lower value of reflectance of vitrinite,moreover,the deviation value was almost the same.Therefore,the test precision of vitrinite reflectance can not meet the requirements of the national standard test methods when the focal length deviated more than 2micron.And the influence of the focal length deviation less than 2 micron should be further studied under the condition of different intensity of illumination and different degree of metamorphism.