研究目的
To present a calibration method to correct for fabrication variations and optical misalignment in a two-dimensional electrowetting scanner.
研究成果
The calibration algorithm for an electrowetting laser scanner can produce a repeatable two-dimensional scan which reduced mean positional errors across 25 points from 43 μm (0.117?) to 10 μm (0.027?) in a calibrated device.
研究不足
The speed of the calibration process is limited by the liquid dynamics. The algorithm encounters issues with overfitting of the data when the calibration error margin approaches the precision of the measurement.
1:Experimental Design and Method Selection
The methodology involves scanning a 5 × 5 grid target using a four-electrode electrowetting prism and observing optical distortion. Zemax optical simulations were used to verify the distortion.
2:Sample Selection and Data Sources
A collimated continuous wave 650 nm laser with a 1.2 mm beam diameter was used. The beam was passed through an adaptive lens to focus the spot directly onto the CMOS camera sensor.
3:List of Experimental Equipment and Materials
Four-electrode electrowetting prism, CMOS camera (Chameleon CM3-U3-13Y3M-CS), 32-channel analog output voltage Data Acquisition system (NI-PCIe 6738), 8-channel amplifier (OKO Bipolar HV amplifier).
4:Experimental Procedures and Operational Workflow
A sinusoidal voltage function at 3 kHz with zero voltage offset was used to drive the electrowetting prism. Beam centroids were determined by projecting the intensity profile into its axial component and fitting them to a gaussian function.
5:Data Analysis Methods
The beam centroids were normalized with the average maximum distance along the primary axes, rotated, and re-centered with respect to the position at flat voltage.
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