2019/12/20 by Hitesh Gowda Bettaswamy Gowda, Ulrike Wallrabe, Gowda, Hitesh Gowda Bettaswamy +1
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #Advanced optical system design #Electrowetting and Microfluidic Technologies #physics.app-ph
paper · pdf · doi:10.48550/arxiv.1912.13506
The article is submitted to International Symposium on Optomechatronic Technologies - ISOT 2019 conference, Goa, India
arxiv created 2019/12/20 · arxiv updated 2020/01/01
We present in this paper an integrated sensor system for closed-loop control of the temperature effects and the hysteresis on the refractive power of an adaptive fluid-membrane piezoelectric lens. The piezoelectric hysteresis and the fluid thermal expansion contribute to a nonlinear response of the lens refractive power defined as a function of the actuation electric field. Hence, a pressure sensor and a temperature sensor are integrated inside the lens to monitor and define the lens refractive power as a function of both the internal fluid pressure and the temperature, thus, allowing for the closed-loop control of the refractive power. The adaptive lens has a refractive power range varying from -16 m-1 to +17 m-1 at 25°C and from -15 m-1 to +28 m 1 at 75°C.