Controlling software design of 2D scanning mirror in infrared detecting
and tracking system
Xiangyan Liu
1, a
, Xiaobing Dai
2,b
and Xudong He
3,c
1
Institute for Pattern Recognition and Artificial Intelligence, School of Automation, Huazhong
University of Science and Technology, Wuhan 430074, China; School of Mechanical Engineering
and Automation, Wuhan University of Textile, Wuhan 430073, China
2, 3
Institute for Pattern Recognition and Artificial Intelligence, School of Automation, Huazhong
University of Science and Technology, Wuhan 430074, China
a
whliuxy@gmail.com,
b
dxb@hust.edu.cn,
c
hxdfriend@yahoo.cn
Keywords: infrared detecting; infrared tracking; 2D scanning mirror; SDK; PID
Abstract. Firstly, this paper introduced infrared detecting and tracking system (IR D&T System) and
several commonly used scanning solutions in IR D&T System briefly. Secondly, it analyzed how 2D
scanning mirror works and PID (Proportion, Integration and Differentiation) algorithm. Thirdly, it
introduced commands format and controlling method of the 2D scanning mirror used in
image-spectrum integrated instrument developed by our group. And then it designed controlling
software of the 2D scanning mirror using its secondary development package (SDK) and VC++. The
software communicates with 2D scanning mirror through serial port. The MSCOMM serial
communication control is used in communication software design. The controlling software is
integrated to software of image-spectrum integrated instrument successfully and experiment results
verified the correctness of controlling algorithm and engineering usability of the software.
Introduction
IR D&T System is mainly designed to detect and identify moving targets in infrared image
sequence, obtain motion parameters of some specified target, such as position, velocity, acceleration,
etc., as well as its trajectory for further processing and analysis, achieve understanding the behavior of
the specified target, output azimuth and elevation errors departing from system boresight of the target
of interests, and drive scanning platform to track the target for higher level tasks through servo control
loop[1~3].
To meet different functions of IR system, such as search, detection, tracking and so on, IR optical
system generally requires to be designed with DFOV (dual field of view) or even MFOV (multi field
of view). Thus IR system can both search existing targets in a large FOV and switch quickly to the
small FOV to observe and track the target with high-resolution [4].
There are mainly two methods to extend FOV, integral moving form and scanning mirror moving
form [5]. IR D&T system in integral moving form means that the whole system is placed on a large
2D (two-dimensional) scanning platform which can tilt and deflect to achieve scanning and tracking.
For all the parts of the system will move with the platform, the platform is very large and the
instrument is usually very bulky. IR D&T system in scanning mirror moving form, there is a scanning
mirror in it. Because only the scanning mirror moves and the other optical components are static, the
system volume can be relatively small and the scanning range can also be relatively large. There are
mainly three kinds of scanning mirror, 45° scanning mirror [6], double wedge scanning mirror [7]
and
2D scanning mirror [8].
PID controller used to control scanning platform generates control parameters according to linear
combinations of proportional, integral and derivative control deviation which is determined by set
value and output value. By adjusting the PID parameters, not only can the system steady precision be
improved, but also the dynamic performance can be improved [9].
This paper analyzed how 2D scanning mirror works and introduced commands format and
controlling method of the 2D scanning mirror used in image-spectrum integrated instrument
Applied Mechanics and Materials Vol. 441 (2014) pp 805-808
Online available since 2013/Dec/04 at www.scientific.net
© (2014) Trans Tech Publications, Switzerland
doi:10.4028/www.scientific.net/AMM.441.805
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