中华人民共和国卫生部药品标准 中药成方制剂(全20册) 部分24.pdf

哈尔滨工业大学理学硕士学位论文
Abstract
Laser possesses many novel advantages over other light source. To find the
object of the long distance or the darkness, the active laser imaging technique has
been widely used in many fields, such as the dock of the bay, forest-fire
prevention, frontier defense, traffic monitoring and so on.
The active laser imaging system consisted of three section including laser
illuminator,3Dtranslation stage and camera lens control foggy,
atomosphere has very strong absorbing and scattering effect. Choising suitable
laser D camera can reduce these effects and raise the imaging quality in
the fog.
In this paper, we introduced the physical characteristics of the atmosphere,
and analyzed the different reasons for the blurring of images in the fog. By
deriving from the characteristics of laser atmospheric transmittance, we got the
formula of the received power of detectors. We summarized the transformation
relationship between the system resolution and lens resolution, calculated the
CCD’s field of view, simulated the situation that the minimum power received by
the detector under different distances for given power laser and gave the base
choosing principle of the detectors. Also, we designed a set of zoom lens by
using the ZEMAX software, which can be used as the reference for the matching
of lens to choice.
We introduced the collimation principle of the semiconductor laser
illuminator, analyzed and designed ponents of the laser illumination
system. Based on the RS232-RS485 codec, we realized real-time control of
rotation of PTZ(Pan Tilt Zoom) and zooming and focusing of lens by using
microcontroller. Video signals acquisition is processed by the image acquisition
card. We analyzed the measures for improving imaging efficiency of the system
in the fog and realized the control of this active laser imaging system by
programs in C language.
Experimentation measurement the opeation wa