Dynamic frequency compensation for transducers

Shi, Wen Juan (1992) Dynamic frequency compensation for transducers. University of Southampton, Doctoral Thesis.

Abstract

In recent years, scientists have made considerable efforts to develop varieties of sensors to meet new demands in performance, size and cost. However, there are always trade-offs between performance and cost. Load sensing is a particular example. One of the factors which contribute to the relative high cost of load cells is the cost of manufacturing and trimming of the billet to reduce the sensor defects. A new generation of sensors, smart sensors, have been developed to compensate the imperfections of transducers. This is performed by incorporating in the transducer a microprocessor and its interface circuitry. This can considerably improve the accuracy and reduce the cost of transducers. In this smart sensor technology, innovation of software for performing the function of transducer compensation is essential. One of the hardest tasks is dynamic frequency compensation. In the work reported here, an optimisation technique is used for the transducer system identification. A major problem is that the load can be a significant part of the inertial parameters of the system. An adaptive filter is developed which compensates for the frequency response for any load in real-time. Tests on a thick-film tri-beam load cell and a precision 1010 load cell have been performed to verify that the problem of the frequency response has been virtually eliminated.

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