A photoelectric ceramic displacement closed-loop servo control experimental device and control method

Abstract

The invention discloses a photoelectric ceramic displacement closed loop experimental device and control method. Photoelectric ceramic generates photovoltage under ultraviolet source illumination, and generates deformation through the inverse piezoelectric effect. After coarse adjusting positioning is completed through a coarse adjusting device composed of a servo motor and a lead screw nut pair, a photoelectric ceramic displacement closed loop servo control device composed of the photoelectric ceramic, a non-contact displacement sensor, a light shutter and a computer is used for performing fine adjusting. The non-contact displacement sensor measures output displacement at the free end of the photoelectric ceramic and feeds back the displacement to the computer in real time. The computer compares displacement data with a set target value, sends an instruction to a light shutter controller, and controls the light shutter to be turned on or turned off, then, the light source illumination time is controlled, and servo control over the output displacement of the photoelectric ceramic is achieved. The displacement closed loop experimental device and control method is applied to the field of micro-drive of photoelectric ceramic, and the foundation is laid for researching dynamic characteristics of output displacement of the photoelectric ceramic.

Description

technical field [0001] The invention relates to a photoelectric ceramic experimental device, in particular to a photoelectric ceramic displacement closed-loop servo control experimental device and a control method thereof. Background technique [0002] Photoelectric ceramics (PLZT) have the characteristics of directly converting light energy into mechanical energy. Due to the photovoltaic effect, it can generate an electrostatic voltage of several KV / cm under light conditions. At the same time, due to the inverse piezoelectric effect, the generated voltage can be transformed into a deformation in the direction of transformation. The drive device based on optoelectronic ceramics has the advantages of non-contact control, wireless energy transmission, and no electromagnetic interference, and can be applied to optical instruments, optical storage, projectors, scanners and other equipment. In recent years, many scholars have carried out the pre-research work of optoelectronic c...

AI Technical Summary

Problems solved by technology

In recent years, many scholars have carried out pre-research work on optoelectronic ceramics in the field of micro-drives. However, the control of the output displacement of optoelectronic ceramics has been in the open-loop stage, and it is impossible to achieve precise closed-loop control.

[0003] The applicant's previous patent "A Micromirror Fine-tuning Device Driven by Photoelectric Ceramics" discloses a device that uses the photodeformation effect of photoelectric ceramics to drive the micromirror for fine-tuning. The device can directly convert light energy into mechanical energy to drive the micromirror. Translation and rotation make the structure more compact, but the specific drive control device and control method in this patent need to be improved

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