Abstract: The large capacity weak grating technology not only has the advantages of sensitive optical fiber sensing detection and on-site passivity, but also has distributed networking and long monitoring distance. It is very suitable for the petrochemical field, and can achieve the efficient automatic detection, judgment and processing of key states of oil pump unit. The weak grating sensing technology is used to monitor the temperature and vibration status of oil pump unit in real time. Once the temperature is abnormal, it will give an alarm immediately. It can also extract key features by analyzing vibration signals in time domain and frequency domain, and identify, warn and determine the location and type of abnormal vibration with the help of pattern recognition algorithm, so as to help maintenance personnel find the failure of oil pump unit in time.

Key words: weak grating, temperature sensing, vibration sensing, pattern recognition