基于非成像光学的车辆测速炮光学准直器系统设计

Le Minh Nhut, T. Pham, Tien-Dung Tran, Vu Dinh Huan, Seoyong Shin
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引用次数: 0

摘要

车速炮通常在正常阳光条件下(白天)使用。如果我们想在弱光条件下(夜间)使用车速枪,则需要照明器为车速枪提供足够的光线来拍照。照明器必须满足两个要求:(i)使用红外波长以确保驾驶员不会被所提出的测速枪系统的照明器刺眼;(ii)高能效以使照明器紧凑,从而使用小型电池系统来提高所提出的车速枪的便携性。在本研究中,介绍了一种使用非成像光学设计的准直器系统的照明器。具有红外波长的LED是从LightToolsTM的库中选择的,准直的结构设计用于将LED阵列的照明转移到3x3m2的正方形区域,以覆盖车辆以检测车辆牌照。设计过程是基于Matlab程序中的光程长度守恒建立的。然后,在LightToolsTM软件中对所设计的准直器进行了仿真。LightToolsTM中有希望的模拟结果表明,准直器可以有效地将光从LED阵列传输到目标区域,均匀性约为70%,光学效率约为80%。
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Design of Optical Collimator System for Vehicle Speed Gun using Non-Imaging Optics
Vehicle speed guns are usually used in normal sunlight conditions (daytime). If we want to use vehicle speed guns in low light conditions (nighttime), the illuminator is needed to provide sufficient light for the vehicle speed gun to take photos. The illuminator must fulfill two requirements: (i) using the infrared wavelength to ensure that the driver is not startled by dazzling eyes by the illuminator of the proposed speed gun system and (ii) high energy efficiency to make the illuminator compact leading to the use a small battery system to improve the portable of the proposed vehicle speed gun. In this study, an illuminator using a collimator system designed by using non-imaging optics is introduced. LEDs with infrared wavelength are chosen from the library of LightToolsTM, the structure of collimated is designed to transfer the illumination from the LEDs array to a square area of 3x3 m2 to cover the vehicle to detect the vehicle number plate. The design process is built based on the conservation of optical path length in the Matlab program. After that, the designed collimator is simulated in LightToolsTM software. The promising results of the simulation in LightToolsTM show that the collimator can efficiently transfer light from the LED array to the target area with a uniformity of about 70 % and optical efficiency of about 80 %.
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来源期刊
CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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