Design of screening and detection system for near infrared LED on optical positioning
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摘要: 光学定位技术在手术导航、目标追踪和虚拟现实等系统中都有广泛的应用，为了提高定位的精度，在信号测量和定位算法方面都进行了大量的研究。设计的系统从作为发光源的近红外LED出发，通过有针对性的筛选，为保证光学定位的准确性创造良好的条件。筛选检测系统由光学性能检测部分和高低温试验部分组成。通过控制转台中俯仰轴和滚动轴的转动角度，使用光电探测器可以连续测量出发光元件的辐射强度，得到近红外LED不同旋转面和不同纵向角度的辐射特性，并计算出半功率角值。根据发光强度和半功率角这两个重要指标，先去除待选组中有明显变化的极值数据，然后选取两个相对偏差都在5%以内的近红外LED，最后对其进行高低温冲击试验。筛选出的近红外LED性能稳定，发光一致性好，可以成组使用。Abstract: Optical positioning technology has been widely used in surgical navigation, target tracking and virtual reality systems, in order to improve the accuracy of positioning, many research work has been done on signal measurement and localization algorithms. Using this system, the quality of the light source used for optical positioning was improved by screening near-infrared LED, and the good conditions were created for accurate positioning. The screening detection system consisted of an optical performance detecting section and a high and low temperature testing section. By controlling the rotation angles of the pitch axis and the rolling axis in the turntable, the radiation intensity of the light-emitting elements could be continuously measured by photodetector, the radiation data of near-infrared LED at different rotating faces and different longitudinal angles was obtained, and the half power angle value could be calculated. According to the two important indicators of luminous intensity and half power angle, first, the extreme value data is removed from the selected group; and then two near-infrared LEDs with relative deviation within 5% were selected; and finally the high-low temperature impact test was performed. The selected near-infrared LEDs have stable performance and good luminous consistency, and can be used in groups.
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Key words:
- near-infrared LED /
- optical positioning /
- radiation intensity /
- relative deviation
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