Abstract
During the process of cell micro operation, the contact force between the entry needle and the cell membrane is usually a very small area to be tested. These two features have been utilized to design a high precision micro force sensor to provide a force feedback in the process of cell micro operation. However, PVDF (Polyvinylidene Fluoride) has continued to display both a wide range of frequency response and a highly sensitive transform between force and electricity. In this paper a charge signal is obtained. In order to transform the charge signal into a voltage signal, a signal processing circuit was designed. The data acquisition card PCI-6221 (National Instruments) was used. It was employed to collect the voltage signal. The resultant micro force sensor was calibrated by using a rating test. The experimental test results demonstrated that the sensitivity and linearity of the designed micro force sensor were higher than the sensitivity and linearity of a traditional piezoelectric sensor.
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