Towards Dynamic Calibration of Force Transducers: Self Error Correction Using the Second Derivative of Sensor Output
摘要
The dynamic calibration method for force transducers is still under development, and several approaches have been proposed and investigated. In previous studies, impact response experiments of a strain gauge–type force transducer were conducted using an optical interferometer, and it was demonstrated that the measurement error in impact-force testing can be estimated and corrected by using the second derivative of the transducer output itself. In the present study, the results of a step response evaluation experiment performed on the same transducer were reanalyzed. The results show that the large dynamic error observed in the rising part of the first peak of the damped oscillation can be successfully estimated and corrected by multiplying the second derivative of the transducer output itself by the dynamic parameter of the transducer obtained from the previous impact response experiment. The finding that most of the dynamic error in the step response, as well as in the impact response, can be estimated and corrected from the transducer output itself represents a significant contribution toward establishing a dynamic calibration method for force transducers. Based on this finding, a pathway toward establishing a reliable dynamic force calibration method is discussed.