The system could rest projection tube resolution in two dimension adopting area - ccd , but also raise precision and speed of resolution - test because of realization of auto focus system that absolutely exclude the affection because of artificial factor . auto - focus system include auto - e - focus system and auto - optics - focus system 该系统不仅采用面阵ccd使该系统能够测试投影管二维分辨率，而且由于实现了自动聚焦系统使得分辨率测试完全不受人为因素的影响，大大提高了分辨率测试的精度和速度。
The water ' s absorption in tissues is particularly great , so the erbium laser is suitable . simultaneously we design the laser alignment system , the laser shaping system and the focal setting system . doing the theoretical analysis and experiments , we research and develop a medical blood - sampling instalment of laser , with the good application prospect 因为掺铒yag固体激光器输出的中心波长为2 . 94 m ，与水的吸收峰相吻合，而且皮肤组织中水的吸收非常显著，所以铒激光是合适的，同时设计了激光对准系统、激光整形系统和聚焦系统，通过理论和实验研究，研制出一台激光采血仪样机，具有良好的应用前景。
