据统计，流体系统70％～80％的故障是由油液污染造成的。在机械的使用、管理和维修现场，准确、简便而快速地判定油液的污染状况，为流体系统技术状态诊断提供可信的依据，是合理实施设备管理与维修的重要前提。现有的诊断与分析技术与手段（如自动颗粒计数器、显微镜颗粒计数 According to statistics, 70% to 80% of fluid system failure is caused by oil pollution. It is an important precondition for the reasonable implementation of equipment management and maintenance to provide a credible basis for diagnosis of the technical condition of the fluid system by accurately, simply, and quickly determining the oil contamination status at the mechanical use, management and maintenance sites. Existing diagnostic and analytical techniques and tools (eg, automated particle counters, microscope particle counting