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公开(公告)号:WO2021185031A1
公开(公告)日:2021-09-23
申请号:PCT/CN2021/077571
申请日:2021-02-24
Applicant: 同方威视技术股份有限公司 , 清华大学
Abstract: 一种用于基于瞳孔图像确定被测对象是否吸毒的基于多传感器的距离与身高的确定方法和装置,包括:利用第一传感器至第三传感器,分别测量被测对象距离安检装置的第一距离至第三距离,并且测量被测对象的第一身高至第三身高(S301);利用第一确定单元分别确定第一距离至第三距离中的每一个距离与最小距离阈值和最大距离阈值的大小关系(S303);利用第二确定单元,基于所确定的第一距离至第三距离中的每一个距离与最小距离阈值和最大距离阈值的大小关系,确定被测对象距离安检装置的最终距离和被测对象的最终身高(S305);以及根据所确定的最终距离和最终身高,对被测对象的瞳孔图像进行像素和尺寸转换,以确定被测对象是否吸毒。
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公开(公告)号:WO2006099805A1
公开(公告)日:2006-09-28
申请号:PCT/CN2006/000469
申请日:2006-03-23
CPC classification number: H01S3/117 , H01S3/067 , H01S3/094007 , H01S3/176
Abstract: In the acoustic optical Q-modulating method, quartz optical fiber of double-clad fiber laser is used as acoustic optic medium directly. Stationary field of sound wave or traveling wave field is formed in the medium so as to form phasegrating. Deflection of transmitting direction of oscillated laser occurred caused by diffraction under effect of the phase grating is as a leaking wave. The leaking wave prevents forming oscillated laser. Thus, laser of optical fiber is in state of low Q value. When traveling wave field is disappeared, laser is in state of high Q value. The acoustic optical Q switch includes a radio frequency excited ultrasonic transducer, medium for sound propagation, sound reflection interface or body of sound absorption. The medium for sound propagation is placed between the transducer and the interface or body of sound absorption. The double-clad fiber is in medium for sound propagation. The acoustic opticical Q switch is realized in coated fiber directly so as to lower insertion loss.
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