Actuation of Dielectric Elastomer and Strain Calculation
Actuation of DE Sample
For each of the DE sample prepared, actuation experiment is carried out to find the strain-voltage relationship at different pre-strain values. The voltage required for the actuation of DE sample is in Kilo Volts. For this the voltage is supplied by an ultra-miniature DC to HVDC converter. The converter used is EMCO's Q101-5 which has input voltage ranging from 0V-5V DC and gives the output voltage as 0V-10KV DC. The turn-on voltage is 0.7V for this device. At 0.7 volts the output of Q101-5 is approximately 1.4KV and the output increases linearly with input voltage. For the supply of input voltage to Q101-5 a regulated DC source is used which can provide voltage ranging from 0V-32V. From Q101-5 the voltage is supplied to the DE sample. Figure below shows the input-output voltage characteristics of Q101-5.
Figure: Input-Output Voltage Characteristics of Q101-5
When the voltage is supplied to the DE sample it actuates due to the electrostatic pressure. The actuation images are to be obtained for the strain calculation using image-processing. For this a tripod with a camera is used. The sample is hung on to a wall with a paper behind the sample. The camera is positioned facing the wall where the sample is hung. The experimental setup is shown in Figure below.
Figure: Experimental Setup for biaxial strain calculation using image processing technique.