旋转机械系统是工业生产中的关键设备 ,为避免重要的机械设备由于意外事故而停产 ,需研究在线测试技术和在线趋势预示技术。介绍了传感器在这一技术中的应用 ,给出了传感器检测的时域信号及频谱分析图 ,同时介绍了包括一系列传感器在内的机械系统在线趋势预示系统的构成。 Rotating mechanical system is the key equipment in the industrial production. To avoid the important mechanical equipment being cut off due to accident, it is necessary to study online testing technology and on-line trend forecasting technology. The application of the sensor in this technology is introduced. The time domain signal and the spectrum analysis chart of the sensor detection are given. The composition of the trend forecasting system of the mechanical system including a series of sensors is also introduced.