Tunable grating with active feedback

We report on the use of capacitive self-sensing to operate a DEA-based tunable grating in closed-loop mode. Due to their large strain capabilities, DEAs are key candidates for tunable optics applications. However, the viscoelasticity of elastomers is detrimental for applications that require long-term stability, such as tunable gratings and lenses. We show that capacitive sensing of the electrode strain can be used to suppress the strain drift and increase the response speed of silicone-based actuators. On the other hand, VHB actuators exhibit a time-dependent permittivity, which causes a drift between the device capacitance and its strain.


Published in:
Proceedings of SPIE, 8687, 86872F
Presented at:
Electroactive Polymer Actuators and Devices (EAPAD), San Diego, USA, March 10, 2013
Year:
2013
Publisher:
Bellingham, Spie-Int Soc Optical Engineering
ISSN:
1996-756X
ISBN:
978-0-8194-9470-2
Keywords:
Laboratories:




 Record created 2013-04-22, last modified 2018-09-13

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