High Performance FOV Switching Mechanism Design for an Infrared Zoom Lens
Date Issued
2009
Date
2009
Author(s)
Tsai, Cheng-Shi
Abstract
The infrared zoom lens is applied extensively in the military use, such as detection, low-altitude observation and exploring. It has the features of being difficult to be found and able to easily observe the object. For military, in order to acquire a high-quality image and different FOVs (field of view), the infrared zoom lens must be capable of the high-speed precision alignment. In this thesis, we have designed and implemented a prototype of the dual field-of-view infrared zoom lens. The infrared zoom lens uses a permanent magnet DC motor as the actuator and a microcontroller as the controller. Through cooperation of two major sensor feedbacks, a shaft encoder and a position sensor, the FOV switching mechanism can achieve the goal of high-speed precision absolute alignment. Experimental results have shown a alignment accuracy average of radians and less than 0.5 second alignment time. Despite the influence of the non-zero backlash and the A/D uncertainty on the infrared zoom lens, the goal of alignment can be reached by the cooperation between the two major sensors and the controller. The control strategy, switching control, was proposed to help us to reach the goal of the high-speed precision absolute alignment.
Subjects
switching control
infrared zoom lens
dual field-of-view
absolute alignment
Type
thesis
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