Aiming at the shortages that the clutter disturbance cann’t be effectively filtered with the common filtering algorithm and the polished rod displacement of well pumping units cann’t be accurately calculated with the individual axis acceleration data when the acceleration sensor not perpendicular to the ground surface

the autocorrelation digital filtering algorithm is adopted to process the acceleration data

and the three-axis acceleration sensor ADXL362 is used to measure the three-axis acceleration of the polished rod. The acceleration data is corrected with phasor synthesis to improve the displacement calculation precision. The hardware circuit

the well pumping unit stroke time calculation and the well pumping unit polished rod displacement calculation are described in detail. The site test data is given and the test shows that the device has the advantages of high reliability

high precision

and low power consumption.