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Research direction：extended depth of field imaging

Experiment content：the extended depth of field imaging is realized by using the property that the liquid crystal lens can keep the lens state when the positive and negative states change.

Purpose of experiment：In the process of positive and negative conversion, the change of focal intensity and aberration of the liquid crystal lens with time was tested to confirm its lens retention characteristics

Test equipment：camera, lens, function generator, ATA-2042 power amplifier, LCD lens

Experimental process：

1.The wavefront of light passing through the liquid crystal lens was obtained by interference method (left figure below), Zernik coefficient was obtained by Zernike function fitting, and finally lens focal intensity and aberration information were obtained.

2.The output voltage is switched through the voltage amplifier, and the image and video obtained at the same time are fused into the extended depth of field map (right figure below).

Result of experiment：

Images captured during the conversion process (left picture below), clear image fusion results of objects in different positions at different times (right picture below), all objects become clear